forked from KolibriOS/kolibrios
650 lines
14 KiB
PHP
650 lines
14 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2009. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; ARP.INC ;;
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;; ;;
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;; Part of the tcp/ip network stack for KolibriOS ;;
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;; ;;
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;; Based on the work of [Johnny_B] and [smb] ;;
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;; ;;
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;; Written by hidnplayr@kolibrios.org ;;
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;; ;;
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;; GNU GENERAL PUBLIC LICENSE ;;
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;; Version 2, June 1991 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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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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ARP_REQUEST_TTL = 20 ; in seconds
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ARP_ENTRY_TTL = 600 ; in seconds
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ETHER_ARP equ 0x0608
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ARP_REQ_OPCODE equ 0x0100 ; request
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ARP_REP_OPCODE equ 0x0200 ; reply
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ARP_TABLE_SIZE equ 20 ; Size of table
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struct ARP_ENTRY
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.IP dd ?
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.MAC dp ?
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.Status dw ?
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.TTL dw ? ; in seconds
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.size:
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ends
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struct ARP_Packet
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.HardwareType dw ?
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.ProtocolType dw ?
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.HardwareSize db ?
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.ProtocolSize db ?
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.Opcode dw ?
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.SenderMAC dp ?
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.SenderIP dd ?
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.TargetMAC dp ?
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.TargetIP dd ?
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ends
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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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align 4
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uglobal
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NumARP dd ?
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ARPTable rb ARP_ENTRY.size * ARP_TABLE_SIZE
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ARP_PACKETS_TX rd MAX_NET_DEVICES
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ARP_PACKETS_RX rd MAX_NET_DEVICES
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endg
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;-----------------------------------------------------------------
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;
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; ARP_init
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;
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; This function resets all ARP variables
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;
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; IN: /
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; OUT: /
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;
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;-----------------------------------------------------------------
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align 4
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ARP_init:
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xor eax, eax
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mov [NumARP], eax
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mov edi, ARP_PACKETS_TX
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mov ecx, 2*MAX_NET_DEVICES
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rep stosd
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ret
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;-----------------------------------------------------------------
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;
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; ARP_IP_to_MAC
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;
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; This function resets all ARP variables
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;
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; IN: eax = IPv4 address
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; OUT: eax = -1 on error, else eax = first two bytes of mac
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; ( high 16 bits are zero)
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; ebx = last four bytes of mac ; TODO: special eax value for 'request send'
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;
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;-----------------------------------------------------------------
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align 4
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ARP_IP_to_MAC:
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DEBUGF 1,"ARP_IP_to_MAC\n"
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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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xor edx, edx ; TODO: find device num in edx
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mov ebx, [IP_LIST+edx]
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and ebx, [SUBNET_LIST+edx]
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mov ecx, eax
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and ecx, [SUBNET_LIST+edx]
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cmp ecx, ebx
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je .local
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mov eax, [GATEWAY_LIST+edx]
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DEBUGF 1,"requested IP is not on subnet, using gateway\n"
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.local:
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; try to find it on the list
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mov ecx, [NumARP]
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test ecx, ecx
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jz .not_in_list
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mov esi, ARPTable + ARP_ENTRY.IP
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.scan_loop:
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cmp [esi], eax
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je .found_it
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add esi, ARP_ENTRY.size
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loop .scan_loop
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.not_in_list:
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DEBUGF 1,"IP not found on list, preparing for ARP request\n"
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; if not, reserve an entry in list and send an ARP request packet
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push eax
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push word ARP_REQUEST_TTL
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push word ARP_AWAITING_RESPONSE
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push dword 0
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push word 0
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push eax
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call ARP_add_entry
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cmp eax, -1
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je .full
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pop eax
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call ARP_create_request
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ret
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.found_it:
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add esi, ARP_ENTRY.MAC
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DEBUGF 1,"Found MAC! (%x-%x-%x-%x-%x-%x)\n",[esi+0]:2,[esi+1]:2,[esi+2]:2,[esi+3]:2,[esi+4]:2,[esi+5]:2
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movzx eax, word [esi]
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mov ebx, [esi+2]
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ret
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.full:
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add esp, 4
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mov eax, -1
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ret
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;---------------------------------------------------------------------------
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;
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; ARP_create_packet
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;
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; IN: ip in eax
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;
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; OUT: /
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;
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;---------------------------------------------------------------------------
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align 4
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ARP_create_request:
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DEBUGF 1,"Create ARP Packet\n"
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call IPv4_dest_to_dev
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push eax ; DestIP
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mov eax, [IP_LIST+4*edi] ; senderIP
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push eax
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mov edi, [ETH_DRV_LIST + 4*edi]
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lea eax, [edi + ETH_DEVICE.mac]
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mov ebx, ETH_BROADCAST
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mov ecx, 60 ; minimum packet size
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mov edx, edi ;;;
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mov di , ETHER_ARP
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call ETH_create_Packet
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cmp edi, -1
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je .exit
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mov ecx, eax
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mov [edi + ARP_Packet.HardwareType], 0x0100 ;Ethernet
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mov [edi + ARP_Packet.ProtocolType], 0x0008 ;IP
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mov [edi + ARP_Packet.HardwareSize], 6 ;MAC-addr length
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mov [edi + ARP_Packet.ProtocolSize], 4 ;IP-addr length
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mov [edi + ARP_Packet.Opcode], ARP_REQ_OPCODE ;Request
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add edi, ARP_Packet.SenderMAC ; sendermac
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lea esi, [ebx + ETH_DEVICE.mac] ;
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movsw ;
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movsd ;
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pop eax ;
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stosd ;
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mov eax, -1 ; destmac
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stosd ;
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stosw ;
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pop eax
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stosd ;
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DEBUGF 1,"ARP Packet for device %x created successfully\n", ebx
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push edx ecx
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jmp ETH_Sender
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.exit:
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add esp, 8
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DEBUGF 1,"Create ARP Packet - failed\n"
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mov eax, -1
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ret
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;---------------------------------------------------------------------------
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;
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; ARP_decrease_entry_ttls
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;
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; IN: /
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; OUT: /
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;
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;---------------------------------------------------------------------------
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align 4
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ARP_decrease_entry_ttls:
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mov ecx, [NumARP]
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test ecx, ecx
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jz .exit
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mov ebx, ARPTable
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.timer_loop:
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cmp [ebx + ARP_ENTRY.TTL], 0xFFFF
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je .timer_loop_end ;if TTL==0xFFFF then it's static entry
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cmp [ebx + ARP_ENTRY.TTL], 0
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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 [ebx + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE
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jne @f
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mov [ebx + ARP_ENTRY.Status], ARP_RESPONSE_TIMEOUT
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mov [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, [NumARP]
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sub esi, ecx ;esi=index of entry, will be deleted
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push ebx ecx
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call ARP_del_entry
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pop ecx ebx
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jmp .timer_loop_end
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.timer_loop_end_with_dec:
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dec [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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.exit:
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ret
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;---------------------------------------------------------------------------
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;
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; ARP_add_entry (or update)
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;
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; IN: arp entry in stack: esp .IP
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; esp+4 .MAC
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; esp+10 .Status
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; esp+12 .TTL
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; esp+14
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;
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; OUT: eax = entry #, -1 on error
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;
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;---------------------------------------------------------------------------
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; TODO: use a mutex
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align 4
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ARP_add_entry:
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DEBUGF 1,"ARP add entry: "
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mov ecx, [NumARP]
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test ecx, ecx
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jz .add
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mov eax, dword[esp + ARP_ENTRY.MAC]
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mov bx , word[esp + ARP_ENTRY.MAC + 4]
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mov esi, ARPTable
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.loop:
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cmp dword [esi + ARP_ENTRY.MAC], eax
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jne .maybe_next
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cmp word [esi + ARP_ENTRY.MAC + 4], bx
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jne .maybe_next
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cmp dword[esi + ARP_ENTRY.TTL], 0xFFFF ; static entry
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jne .notstatic
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cmp dword[esp + ARP_ENTRY.TTL], 0xFFFF
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jne .error
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.notstatic:
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mov ebx, [NumARP]
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xchg ebx, ecx
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sub ecx, ebx
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jmp .add
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.maybe_next:
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add esi, ARP_ENTRY.size
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loop .loop
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mov ecx, [NumARP]
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cmp ecx, ARP_TABLE_SIZE
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jge .error
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.add:
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push ecx
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imul ecx, ARP_ENTRY.size
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lea edi, [ecx + ARPTable]
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lea esi, [esp + 8]
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mov ecx, ARP_ENTRY.size/2
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repz movsw
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inc [NumARP]
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pop eax
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.exit:
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pop ebx ; return addr
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add esp, ARP_ENTRY.size
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DEBUGF 1,"Exiting\n"
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jmp ebx
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.error:
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DEBUGF 1,"error! \n"
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mov eax, -1
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jmp .exit
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;---------------------------------------------------------------------------
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;
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; ARP_del_entry
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;
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; IN: entry # in esi
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; OUT: /
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;
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;---------------------------------------------------------------------------
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align 4
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ARP_del_entry:
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DEBUGF 1,"ARP del entry %u, total entrys: %u\n", esi, [NumARP]
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cmp esi, [NumARP]
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jge .error
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DEBUGF 1,"deleting the entry..\n"
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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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rep movsw
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dec [NumARP] ;decrease arp-entries counter
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.error:
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ret
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;-----------------------------------------------------
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;
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; ARP_Handler:
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;
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; This function handles ARP protocol over ethernet
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; (other protocols may follow in the future)
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;
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; IN: Pointer to buffer in [esp]
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; size of buffer in [esp+4]
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; packet size (without ethernet header) in ecx
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; OUT: /
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;
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;-----------------------------------------------------
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align 4
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ARP_handler:
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DEBUGF 1,"ARP_Handler - start\n"
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cmp ecx, 28
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jl .exit
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cmp word [edx + ARP_Packet.Opcode], ARP_REP_OPCODE ; Is this a reply packet?
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jne .maybe_request
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DEBUGF 1,"ARP_Handler - it's a reply packet from %u.%u.%u.%u\n",\
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[edx + ARP_Packet.SenderIP]:1,[edx + ARP_Packet.SenderIP+1]:1,[edx + ARP_Packet.SenderIP+2]:1,[edx + ARP_Packet.SenderIP+3]:1,
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mov ecx, [NumARP]
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test ecx, ecx
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jz .exit
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mov eax, [edx + ARP_Packet.SenderIP]
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mov esi, ARPTable+ARP_ENTRY.IP
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.loop:
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cmp [esi], eax
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je .gotit
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add esi, ARP_ENTRY.size
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loop .loop
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jmp .exit
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.gotit:
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DEBUGF 1,"ARP_Handler - found matching entry\n"
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cmp [esi+ARP_ENTRY.Status], 0x0300 ;if it is a static entry, dont touch it
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je .exit
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DEBUGF 1,"ARP_Handler - updating entry\n"
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mov [esi+ARP_ENTRY.Status], ARP_VALID_MAPPING
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mov [esi+ARP_ENTRY.TTL], ARP_ENTRY_TTL
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mov eax, dword [edx + ARP_Packet.SenderMAC]
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mov dword [esi+ARP_ENTRY.MAC], eax
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mov ax , word [edx + ARP_Packet.SenderMAC + 4]
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mov word [esi+ARP_ENTRY.MAC+4], ax
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jmp .exit
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;------
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.maybe_request:
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cmp word [edx + ARP_Packet.Opcode], ARP_REQ_OPCODE ; Is this a request packet?
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jne .exit
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call ETH_struc2dev
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DEBUGF 1,"ARP Request packet through device: %u\n", edi
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inc [ARP_PACKETS_RX+4*edi]
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cmp edi, -1
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jz .exit
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mov eax, edi
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shl eax, 2
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add eax, IP_LIST
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mov eax, [eax]
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cmp eax, [edx + ARP_Packet.TargetIP] ; Is it looking for my IP address?
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jnz .exit
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push eax
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push edi
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; OK, it is a request for one of our MAC addresses. Build the frame and send it
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; We can reuse the buffer. (faster then using ARP_create_packet)
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cld
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lea esi, [edx + ARP_Packet.SenderMAC]
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lea edi, [edx + ARP_Packet.TargetMAC]
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movsd ; Move Sender Mac to Dest MAC
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movsw ;
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movsd ; Move sender IP to Dest IP
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pop esi
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mov esi, [ETH_DRV_LIST + 4*esi]
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lea esi, [esi + ETH_DEVICE.mac]
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lea edi, [edx + ARP_Packet.SenderMAC]
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movsd ; Copy MAC address from in MAC_LIST
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movsw ;
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pop eax
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stosd ; Write our IP
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mov word [edx + ARP_Packet.Opcode], ARP_REP_OPCODE
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; Now, Fill in ETHERNET header
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mov edi, [esp]
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lea esi, [edx + ARP_Packet.TargetMAC]
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movsd
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movsw
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lea esi, [edx + ARP_Packet.SenderMAC]
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movsd
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movsw
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; mov ax , ETHER_ARP
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; stosw
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DEBUGF 1,"ARP_Handler - Sending reply \n"
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jmp ETH_Sender ; And send it!
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.exit:
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call kernel_free
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add esp, 4 ; pop (balance stack)
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DEBUGF 1,"ARP_Handler - exiting\n"
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ret
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;---------------------------------------------------------------------------
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;
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; ARP_API
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;
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; This function is called by system function 75
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;
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; IN: subfunction number in bl
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; device number in bh
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; ecx, edx, .. depends on subfunction
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;
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; OUT:
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;
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;---------------------------------------------------------------------------
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align 4
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ARP_API:
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movzx eax, bh
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shl eax, 2
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test bl, bl
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jz .packets_tx ; 0
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dec bl
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jz .packets_rx ; 1
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dec bl
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jz .entries ; 2
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dec bl
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jz .read ; 3
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dec bl
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jz .write ; 4
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dec bl
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jz .remove ; 5
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dec bl
|
|
|
|
.error:
|
|
mov eax, -1
|
|
ret
|
|
|
|
.packets_tx:
|
|
add eax, ARP_PACKETS_TX
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.packets_rx:
|
|
add eax, ARP_PACKETS_RX
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.entries:
|
|
mov eax, [NumARP]
|
|
ret
|
|
|
|
.read:
|
|
cmp ecx, [NumARP]
|
|
jge .error
|
|
; edi = pointer to buffer
|
|
; ecx = # entry
|
|
imul ecx, ARP_ENTRY.size
|
|
add ecx, ARPTable
|
|
mov esi, ecx
|
|
mov ecx, ARP_ENTRY.size/2
|
|
rep movsw
|
|
|
|
xor eax, eax
|
|
ret
|
|
|
|
.write:
|
|
; esi = pointer to buffer
|
|
sub esp, ARP_ENTRY.size
|
|
mov edi, esp
|
|
mov ecx, ARP_ENTRY.size/2
|
|
rep movsw
|
|
jmp ARP_add_entry ;out: eax = entry number, -1 on error
|
|
|
|
.remove:
|
|
; ecx = # entry
|
|
mov esi, ecx
|
|
call ARP_del_entry
|
|
ret
|
|
|