forked from KolibriOS/kolibrios
637 lines
18 KiB
PHP
637 lines
18 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2013. 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 = 0
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ARP_VALID_MAPPING = 1
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ARP_AWAITING_RESPONSE = 2
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ARP_RESPONSE_TIMEOUT = 3
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ARP_REQUEST_TTL = 31 ; 20 s
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ARP_ENTRY_TTL = 937 ; 600 s
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ARP_STATIC_ENTRY = -1
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ARP_REQ_OPCODE = 0x0100 ; request
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ARP_REP_OPCODE = 0x0200 ; reply
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ARP_TABLE_SIZE = 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 ?
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ends
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struct ARP_header
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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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align 4
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uglobal
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NumARP dd ?
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ARP_table rb ARP_TABLE_SIZE * sizeof.ARP_entry ; TODO: separate ARP table and stats per interface
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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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ARP_CONFLICTS 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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;-----------------------------------------------------------------
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macro 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, 3*MAX_NET_DEVICES
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rep stosd
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}
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;---------------------------------------------------------------------------
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;
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; ARP_decrease_entry_ttls
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;
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;---------------------------------------------------------------------------
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macro ARP_decrease_entry_ttls {
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local .loop
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local .exit
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; The TTL field is decremented every second, and is deleted when it reaches 0.
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; 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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mov ecx, [NumARP]
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test ecx, ecx
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jz .exit
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mov esi, ARP_table
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.loop:
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cmp [esi + ARP_entry.TTL], ARP_STATIC_ENTRY
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je .next
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dec [esi + ARP_entry.TTL]
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jz .time_out
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.next:
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add esi, sizeof.ARP_entry
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dec ecx
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jnz .loop
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jmp .exit
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.time_out:
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cmp [esi + ARP_entry.Status], ARP_AWAITING_RESPONSE
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je .response_timeout
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push esi ecx
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call ARP_del_entry
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pop ecx esi
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jmp .next
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.response_timeout:
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mov [esi + ARP_entry.Status], ARP_RESPONSE_TIMEOUT
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mov [esi + ARP_entry.TTL], 10
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jmp .next
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.exit:
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}
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;-----------------------------------------------------------------
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;
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; ARP_input
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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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; packet ptr in edx
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; device ptr in ebx
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; OUT: /
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;
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;-----------------------------------------------------------------
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align 4
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ARP_input:
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;-----------------------------------------
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; Check validity and print some debug info
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cmp ecx, sizeof.ARP_header
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jb .exit
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call NET_ptr_to_num
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cmp edi, -1
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jz .exit
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inc [ARP_PACKETS_RX + 4*edi] ; update stats
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DEBUGF 1,"ARP_input: got packet from %u.%u.%u.%u through device %u\n",\
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[edx + ARP_header.SenderIP]:1, [edx + ARP_header.SenderIP + 1]:1,\
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[edx + ARP_header.SenderIP + 2]:1, [edx + ARP_header.SenderIP + 3]:1, edi
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;------------------------------
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; First, check for IP collision
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mov eax, [edx + ARP_header.SenderIP]
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cmp eax, [IP_LIST + 4*edi]
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je .collision
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;---------------------
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; Handle reply packets
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cmp [edx + ARP_header.Opcode], ARP_REP_OPCODE
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jne .maybe_request
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DEBUGF 1,"ARP_input: It's a reply\n"
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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 esi, ARP_table
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.loop:
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cmp [esi + ARP_entry.IP], eax
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je .gotit
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add esi, sizeof.ARP_entry
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dec ecx
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jnz .loop
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DEBUGF 1,"ARP_input: no matching entry found\n"
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jmp .exit
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.gotit:
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DEBUGF 1,"ARP_input: found matching entry\n"
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cmp [esi + ARP_entry.TTL], ARP_STATIC_ENTRY ; if it is a static entry, dont touch it
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je .exit
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DEBUGF 1,"ARP_input: 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_header.SenderMAC]
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mov dword [esi + ARP_entry.MAC], eax
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mov cx, word [edx + ARP_header.SenderMAC + 4]
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mov word [esi + ARP_entry.MAC + 4], cx
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jmp .exit
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;-----------------------
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; Handle request packets
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.maybe_request:
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cmp [edx + ARP_header.Opcode], ARP_REQ_OPCODE
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jne .exit
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DEBUGF 1,"ARP_input: its a request\n"
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mov eax, [IP_LIST + 4*edi]
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cmp eax, [edx + ARP_header.TargetIP] ; Is it looking for my IP address?
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jne .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.
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; Build the frame and send it. We can reuse the buffer. (faster then using ARP_create_packet)
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lea esi, [edx + ARP_header.SenderMAC]
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lea edi, [edx + ARP_header.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, [NET_DRV_LIST + 4*esi]
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lea esi, [esi + ETH_DEVICE.mac]
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lea edi, [edx + ARP_header.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 [edx + ARP_header.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_header.TargetMAC]
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movsd
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movsw
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lea esi, [edx + ARP_header.SenderMAC]
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movsd
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movsw
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; mov ax , ETHER_ARP ; It's already there, I'm sure of it!
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; stosw
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DEBUGF 1,"ARP_input: Sending reply\n"
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call [ebx + NET_DEVICE.transmit]
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ret
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.collision:
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inc [ARP_CONFLICTS + 4*edi]
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DEBUGF 1,"ARP_input: IP address conflict detected!\n"
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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_input: exiting\n"
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ret
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;---------------------------------------------------------------------------
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;
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; ARP_output_request
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;
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; IN: ip in eax
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; device in edi
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; OUT: /
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;
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;---------------------------------------------------------------------------
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align 4
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ARP_output_request:
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push eax ; DestIP
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pushd [IP_LIST + edi] ; SenderIP
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inc [ARP_PACKETS_TX + edi] ; assume we will succeed
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DEBUGF 1,"ARP_output_request: ip=%u.%u.%u.%u\n",\
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[esp]:1, [esp + 1]:1, [esp + 2]:1, [esp + 3]:1
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mov ebx, [NET_DRV_LIST + edi] ; device ptr
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lea eax, [ebx + ETH_DEVICE.mac] ; local device mac
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mov edx, ETH_BROADCAST ; broadcast mac
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mov ecx, sizeof.ARP_header
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mov di, ETHER_ARP
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call ETH_output
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jz .exit
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mov ecx, eax
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mov [edi + ARP_header.HardwareType], 0x0100 ; Ethernet
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mov [edi + ARP_header.ProtocolType], 0x0008 ; IP
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mov [edi + ARP_header.HardwareSize], 6 ; MAC-addr length
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mov [edi + ARP_header.ProtocolSize], 4 ; IP-addr length
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mov [edi + ARP_header.Opcode], ARP_REQ_OPCODE ; Request
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add edi, ARP_header.SenderMAC
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lea esi, [ebx + ETH_DEVICE.mac] ; SenderMac
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movsw ;
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movsd ;
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pop eax ; SenderIP
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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 ; DestIP
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stosd ;
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DEBUGF 1,"ARP_output_request: device=%x\n", ebx
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push edx ecx
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call [ebx + NET_DEVICE.transmit]
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ret
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.exit:
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add esp, 4 + 4
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DEBUGF 1,"ARP_output_request: failed\n"
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sub eax, eax
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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: esi = ptr to entry (can easily be made on the stack)
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; OUT: eax = entry #, -1 on error
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; edi = ptr to newly created entry
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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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cmp ecx, ARP_TABLE_SIZE ; list full ?
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jae .error
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xor eax, eax
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mov edi, ARP_table
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mov ecx, [esi + ARP_entry.IP]
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.loop:
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cmp [edi + ARP_entry.Status], ARP_NO_ENTRY ; is this slot empty?
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je .add
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cmp [edi + ARP_entry.IP], ecx ; if not, check if it doesnt collide
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jne .maybe_next
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cmp [edi + ARP_entry.TTL], ARP_STATIC_ENTRY ; ok, its the same IP, update it if not static
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jne .add
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.maybe_next: ; try the next slot
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add edi, sizeof.ARP_entry
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inc eax
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cmp eax, ARP_TABLE_SIZE
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jae .error
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jmp .loop
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.add:
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mov ecx, sizeof.ARP_entry/2
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rep movsw
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inc [NumARP]
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sub edi, sizeof.ARP_entry
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DEBUGF 1,"entry=%u\n", eax
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ret
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.error:
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DEBUGF 1,"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_del_entry
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;
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; IN: esi = ptr to arp entry
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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: entry=%x entrys=%u\n", esi, [NumARP]
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DEBUGF 1,"ARP_del_entry: IP=%u.%u.%u.%u\n", \
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[esi + ARP_entry.IP]:1, [esi + ARP_entry.IP + 1]:1, [esi + ARP_entry.IP + 2]:1, [esi + ARP_entry.IP + 3]:1
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mov ecx, ARP_table + (ARP_TABLE_SIZE - 1) * sizeof.ARP_entry
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sub ecx, esi
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shr ecx, 1
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mov edi, esi
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add esi, sizeof.ARP_entry
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rep movsw
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xor eax, eax
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mov ecx, sizeof.ARP_entry/2
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rep stosw
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dec [NumARP]
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DEBUGF 1,"ARP_del_entry: success\n"
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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 translates an IP address to a MAC address
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;
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; IN: eax = IPv4 address
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; edi = device number
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; OUT: eax = -1 on error, -2 means request send
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; else, ax = first two bytes of mac (high 16 bits of eax will be 0)
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; ebx = last four bytes of mac
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; edi = unchanged
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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: %u.%u", al, ah
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rol eax, 16
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DEBUGF 1,".%u.%u\n", al, ah
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rol eax, 16
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cmp eax, 0xffffffff
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je .broadcast
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;--------------------------------
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; Try to find the IP in ARP_table
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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, ARP_table + 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, sizeof.ARP_entry
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loop .scan_loop
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.not_in_list:
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DEBUGF 1,"ARP_IP_to_MAC: preparing for ARP request\n"
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;--------------------
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; Send an ARP request
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push eax edi ; save IP for ARP_output_request
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; Now create the ARP entry
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pushw ARP_REQUEST_TTL ; TTL
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pushw ARP_AWAITING_RESPONSE ; status
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pushd 0 ; mac
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pushw 0
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pushd eax ; ip
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mov esi, esp
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call ARP_add_entry
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add esp, sizeof.ARP_entry ; clear the entry from stack
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cmp eax, -1 ; did ARP_add_entry fail?
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je .full
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mov esi, edi
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pop edi eax ; IP in eax, device number in edi, for ARP_output_request
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push esi edi
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call ARP_output_request ; And send a request
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pop edi esi
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;-----------------------------------------------
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; At this point, we got an ARP entry in the list
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.found_it:
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cmp [esi + ARP_entry.Status], ARP_VALID_MAPPING ; Does it have a MAC assigned?
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je .valid
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cmp [esi + ARP_entry.Status], ARP_AWAITING_RESPONSE ; Are we waiting for reply from remote end?
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jne .give_up
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push esi
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mov esi, 10 ; wait 10 ms
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call delay_ms
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pop esi
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jmp .found_it ; now check again
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.valid:
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DEBUGF 1,"ARP_IP_to_MAC: found MAC\n"
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movzx eax, word[esi + ARP_entry.MAC]
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mov ebx, dword[esi + ARP_entry.MAC + 2]
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ret
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.full:
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DEBUGF 1,"ARP_IP_to_MAC: table is full!\n"
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add esp, 8
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.give_up:
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DEBUGF 1,"ARP_IP_to_MAC: entry has no valid mapping!\n"
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mov eax, -1
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ret
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.broadcast:
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mov eax, 0x0000ffff
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mov ebx, 0xffffffff
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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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and ebx, 0xff
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cmp ebx, .number
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ja .error
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jmp dword [.table + 4*ebx]
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.table:
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dd .packets_tx ; 0
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dd .packets_rx ; 1
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dd .entries ; 2
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dd .read ; 3
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dd .write ; 4
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dd .remove ; 5
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dd .send_announce ; 6
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dd .conflicts ; 7
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.number = ($ - .table) / 4 - 1
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.error:
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mov eax, -1
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ret
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.packets_tx:
|
|
mov eax, [ARP_PACKETS_TX + eax]
|
|
ret
|
|
|
|
.packets_rx:
|
|
mov eax, [ARP_PACKETS_RX + eax]
|
|
ret
|
|
|
|
.conflicts:
|
|
mov eax, [ARP_CONFLICTS + 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
|
|
|
|
.send_announce:
|
|
mov edi, eax
|
|
mov eax, [IP_LIST + eax]
|
|
call ARP_output_request ; now send a gratuitous ARP
|
|
ret
|
|
|