forked from KolibriOS/kolibrios
769 lines
20 KiB
PHP
769 lines
20 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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;; IPv4.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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; IP underlying protocols numbers
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ETHER_IPv4 equ 0x0008 ; Reversed from 0800 for intel
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MAX_FRAGMENTS equ 16
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MAX_IP equ MAX_NET_DEVICES
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struct IPv4_Packet
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.VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits]
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.TypeOfService db ?
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.TotalLength dw ?
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.Identification dw ?
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.FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15]
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.TimeToLive db ? ;
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.Protocol db ?
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.HeaderChecksum dw ?
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.SourceAddress dd ?
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.DestinationAddress dd ?
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.DataOrOptional:
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ends
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struct FRAGMENT_slot
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.ttl dw ? ; Time to live for this entry, 0 for empty slot's
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.id dw ? ; Identification field from IP header
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.SrcIP dd ? ; .. from IP header
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.DstIP dd ? ; .. from IP header
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.ptr dd ? ; Pointer to first packet
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.size:
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ends
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struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets
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.PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet)
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.NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet)
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.Owner dd ? ; Pointer to structure of driver
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rb 2 ; to match ethernet header size ; TODO: fix this hack
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.Data: ; Ip header begins here (we will need the IP header to re-construct the complete packet)
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ends
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align 4
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uglobal
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BROADCAST dd ?
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IP_LIST rd MAX_IP
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SUBNET_LIST rd MAX_IP
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DNS_LIST rd MAX_IP
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GATEWAY_LIST rd MAX_IP
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IP_PACKETS_TX rd MAX_IP
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IP_PACKETS_RX rd MAX_IP
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FRAGMENT_LIST rb MAX_FRAGMENTS*FRAGMENT_slot.size
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endg
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;-----------------------------------------------------------------
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;
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; IPv4_init
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;
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; This function resets all IP 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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IPv4_init:
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or eax, -1
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mov edi, BROADCAST
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mov ecx, 4*MAX_IP+1
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rep stosd
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xor eax, eax
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mov edi, FRAGMENT_LIST
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mov ecx, FRAGMENT_slot.size*MAX_FRAGMENTS/4 + 2*MAX_IP
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rep stosd
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ret
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;-----------------------------------------------------------------
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;
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; IPv4_Handler:
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;
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; Will check if IP Packet isnt damaged
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; and call appropriate handler. (TCP/UDP/ICMP/..)
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;
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; It will also re-construct fragmented packets
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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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; pointer to device struct in ebx
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; pointer to IP Packet data in edx
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; OUT: /
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;
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;-----------------------------------------------------------------
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align 4
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IPv4_handler: ; TODO: clean up this mess
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; for instance, there should be only one piece of code wich make the jump to an underlying protocol, and not two..
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; TODO2: add code for IPv4 sockets (raw sockets)
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DEBUGF 1,"IP_Handler - start\n"
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push edx ebx
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; save checksum, and clear it in original packet
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mov di , [edx + IPv4_Packet.HeaderChecksum]
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mov word [edx + IPv4_Packet.HeaderChecksum], 0
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; Re-calculate checksum
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movzx ecx, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field
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and ecx, 0x0000000F ;
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shl cx , 2 ;
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mov esi, edx
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xor edx, edx
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call checksum_1
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call checksum_2
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; now compare the two..
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cmp dx, di
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pop ebx edx
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jne .dump ; if checksum isn't valid then dump packet
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DEBUGF 1,"IPv4 Checksum is correct\n",di
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mov eax, [edx + IPv4_Packet.DestinationAddress]
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mov edi, BROADCAST
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mov ecx, MAX_IP+1
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repnz scasd
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jz .ip_ok
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not eax
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test eax, 127 shl 24 ; 127.x.x.x
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jz .ip_ok
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; TODO: we need to check for broadcasts (other then 255.255.255.255)
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jmp .dump
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.ip_ok:
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call ETH_struc2dev ; TODO: make this work on other protocols too!
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inc [IP_PACKETS_RX+4*edi]
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DEBUGF 1,"packet comes from %u.%u.%u.%u\n",\
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[edx + IPv4_Packet.SourceAddress]:1,[edx + IPv4_Packet.SourceAddress + 1]:1,[edx + IPv4_Packet.SourceAddress + 2]:1,[edx + IPv4_Packet.SourceAddress + 3]:1
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mov al , [edx + IPv4_Packet.VersionAndIHL]
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and al , 0x0f ; get IHL(header length)
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cmp al , 0x05 ; IHL!= 5*4(20 bytes)
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jnz .dump ; TODO: dont dump packets wich have optional fiels !!! /!\
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cmp byte [edx + IPv4_Packet.TimeToLive], 0
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je .dump
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movzx eax, word [edx + IPv4_Packet.FlagsAndFragmentOffset]
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xchg al , ah
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test ax , 1 shl 13 ; Is 'more fragments' flag set ?
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jnz .yes_fragments ; If so, we definately have a fragmented packet
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test ax , 0x1fff ; If flag is not set, but there is a fragment offset, the packet is last in series of fragmented packets
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jnz .last_fragment
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.handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed
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movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field
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and eax, 0x0000000F ;
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shl eax, 2 ;
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movzx ecx, word [edx + IPv4_Packet.TotalLength] ; Calculate length of encapsulated Packet
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xchg cl , ch ;
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sub ecx, eax ;
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add eax, edx
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push eax
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mov al , [edx + IPv4_Packet.Protocol]
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mov esi, [edx + IPv4_Packet.SourceAddress]
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mov edi, [edx + IPv4_Packet.DestinationAddress]
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pop edx ; Offset to data (tcp/udp/icmp/.. Packet)
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cmp al , IP_PROTO_TCP
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je TCP_handler
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cmp al , IP_PROTO_UDP
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je UDP_handler
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cmp al , IP_PROTO_ICMP
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je ICMP_handler
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DEBUGF 1,"unknown protocol: %u\n",al
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.dump:
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DEBUGF 1,"IP_Handler - done\n"
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; inc [dumped_rx_count]
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call kernel_free
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add esp, 4 ; pop (balance stack)
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ret
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.yes_fragments:
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shl ax , 3
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DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_Packet.Identification]:4
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test ax , ax ; Is this the first packet of the fragment?
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jnz .not_first_fragment
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DEBUGF 1,"First fragmented packet received!\n"
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; try to locate a free slot..
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mov ecx, MAX_FRAGMENTS
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mov esi, FRAGMENT_LIST
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.find_free_slot:
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cmp word [esi + FRAGMENT_slot.ttl], 0
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je .found_free_slot
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add esi, FRAGMENT_slot.size
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loop .find_free_slot
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jmp .dump ; If no free slot was found, dump the packet
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.found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure
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mov word [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl
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mov ax , word [edx + IPv4_Packet.Identification]
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mov word [esi + FRAGMENT_slot.id], ax
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mov eax, dword [edx + IPv4_Packet.SourceAddress]
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mov dword [esi + FRAGMENT_slot.SrcIP], eax
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mov eax, dword [edx + IPv4_Packet.DestinationAddress]
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mov dword [esi + FRAGMENT_slot.DstIP], eax
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pop eax
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mov dword [esi + FRAGMENT_slot.ptr], eax
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; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure
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mov [eax + FRAGMENT_entry.NextPtr], -1
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mov [eax + FRAGMENT_entry.PrevPtr], -1
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mov [eax + FRAGMENT_entry.Owner], ebx
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add esp, 4 ; balance stack and exit
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ret
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.not_first_fragment:
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DEBUGF 1,"Middle fragmented packet received!\n"
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call .find_fragment_slot
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cmp esi, -1
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je .dump
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mov word [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl
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mov esi, [esi + FRAGMENT_slot.ptr]
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or edi, -1
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.find_last_entry: ; The following routine will try to find the last entry
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cmp edi, [esi + FRAGMENT_entry.PrevPtr]
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jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
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mov edi, esi
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mov esi, [esi + FRAGMENT_entry.NextPtr]
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cmp esi, -1
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jne .find_last_entry
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; We found the last entry (pointer is noww in edi)
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; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure
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pop eax ; pointer to packet
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mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry
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mov [eax + FRAGMENT_entry.NextPtr], -1
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mov [eax + FRAGMENT_entry.PrevPtr], edi
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mov [eax + FRAGMENT_entry.Owner], ebx
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add esp, 4
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ret
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.last_fragment:
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DEBUGF 1,"Last fragmented packet received!\n"
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call .find_fragment_slot
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cmp esi, -1
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je .dump
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mov esi, [esi + FRAGMENT_slot.ptr] ; We found the first entry, let's calculate total size of the packet in eax, so we can allocate a buffer
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push esi
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xor eax, eax ;
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or edi, -1
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.count_bytes:
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cmp [esi + FRAGMENT_entry.PrevPtr], edi
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jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
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mov cx, word [esi + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Add total length
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xchg cl, ch
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DEBUGF 1,"Packet size: %u\n", cx
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add ax, cx
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movzx cx, byte [esi + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Sub Header length
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and cx, 0x000F
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shl cx, 2
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DEBUGF 1,"Header size: %u\n", cx
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sub ax, cx
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mov edi, esi
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mov esi, [esi + FRAGMENT_entry.NextPtr]
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cmp esi, -1
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jne .count_bytes
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mov esi, [esp+4] ;;;
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mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code
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mov [esi + FRAGMENT_entry.NextPtr], -1
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mov [esi + FRAGMENT_entry.PrevPtr], edi
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mov [esi + FRAGMENT_entry.Owner], ebx
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mov cx, [edx + IPv4_Packet.TotalLength] ; Note: This time we dont substract Header length
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xchg cl , ch
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DEBUGF 1,"Packet size: %u\n", cx
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add ax , cx
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DEBUGF 1,"Total Received data size: %u\n", eax
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push eax
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mov ax , [edx + IPv4_Packet.FlagsAndFragmentOffset]
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xchg al , ah
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shl ax , 3
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add cx , ax
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pop eax
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DEBUGF 1,"Total Fragment size: %u\n", ecx
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cmp ax, cx
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jne .destroy_slot_pop
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push eax
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push eax
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call kernel_alloc
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test eax, eax
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je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot
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mov edx, [esp+4] ; Get pointer to first fragment entry back in edx
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.rebuild_packet_loop:
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movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.FlagsAndFragmentOffset] ; Calculate the fragment offset
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xchg cl , ch ; intel byte order
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shl cx , 3 ; multiply by 8 and clear first 3 bits
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DEBUGF 1,"Fragment offset: %u\n", cx
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lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment
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movzx ebx, byte [edx + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Find header size (in ebx) of fragment
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and bx , 0x000F ;
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shl bx , 2 ;
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lea esi, [edx + FRAGMENT_entry.Data] ; Set esi to the correct begin of fragment
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movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Calculate total length of fragment
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xchg cl, ch ; intel byte order
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cmp edi, eax ; Is this packet the first fragment ?
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je .first_fragment
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sub cx, bx ; If not, dont copy the header
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add esi, ebx ;
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.first_fragment:
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push cx ; First copy dword-wise, then byte-wise
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shr cx, 2 ;
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rep movsd ;
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pop cx ;
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and cx, 3 ;
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rep movsb ;
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push eax
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push edx ; Push pointer to fragment onto stack
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mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer
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call kernel_free ; free the previous fragment buffer (this uses the value from stack)
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pop eax
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cmp edx, -1 ; Check if it is last fragment in chain
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jne .rebuild_packet_loop
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pop ecx ;
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xchg cl, ch
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mov edx, eax
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mov word [edx + IPv4_Packet.TotalLength], cx
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add esp, 8
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xchg cl, ch ; This prints the IP packet to the debug board (usefull when using serial output debug..)
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push ecx ;;;;
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push eax ;;;;
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; mov esi, edx ;
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; ;
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; @@: ;
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; lodsb ;
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; DEBUGF 1,"%x ", eax:2 ;
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; loop @r ;
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movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field
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and ax, 0x000F ;
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shl ax, 2 ;
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sub ecx, eax
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add eax, edx
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push eax
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mov al , [edx + IPv4_Packet.Protocol]
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mov esi, [edx + IPv4_Packet.SourceAddress]
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mov edi, [edx + IPv4_Packet.DestinationAddress]
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pop edx ; Offset to data (tcp/udp/icmp/.. Packet)
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cmp al , IP_PROTO_TCP
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je TCP_handler
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cmp al , IP_PROTO_UDP
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je UDP_handler
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cmp al , IP_PROTO_ICMP
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je ICMP_handler_fragments
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DEBUGF 1,"IP_Handler - unknown protocol:%u\n",al
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call kernel_free
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add esp, 8 ; pop (balance stack)
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ret
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.destroy_slot_pop:
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add esp, 4
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.destroy_slot:
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DEBUGF 1,"Destroy fragment slot!\n"
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; TODO!
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jmp .dump
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;-----------------------------------------------------------------
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;
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; find fragment slot
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;
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; IN: pointer to fragmented packet in edx ; TODO: the RFC says we should check protocol too
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; OUT: pointer to slot in edi, -1 on error
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;
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;-----------------------------------------------------------------
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.find_fragment_slot:
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push eax ebx ecx edx
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mov ax , word [edx + IPv4_Packet.Identification]
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mov ecx, MAX_FRAGMENTS
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mov esi, FRAGMENT_LIST
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mov ebx, dword [edx + IPv4_Packet.SourceAddress]
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mov edx, dword [edx + IPv4_Packet.DestinationAddress]
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.find_slot:
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cmp word [esi + FRAGMENT_slot.id], ax
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jne .try_next
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cmp dword [esi + FRAGMENT_slot.SrcIP], ebx
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jne .try_next
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cmp dword [esi + FRAGMENT_slot.DstIP], edx
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je .found_slot
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.try_next:
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add esi, FRAGMENT_slot.size
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loop .find_slot
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; pop edx ebx
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or esi, -1
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; ret
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.found_slot:
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pop edx ecx ebx eax
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ret
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;-----------------------------------------------------------------
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;
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; Decrease TimeToLive of all fragment slots
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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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IPv4_decrease_fragment_ttls:
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mov esi, FRAGMENT_LIST
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mov ecx, MAX_FRAGMENTS
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.loop:
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cmp [esi + FRAGMENT_slot.ttl], 0
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je .try_next
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dec [esi + FRAGMENT_slot.ttl]
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jnz .try_next
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DEBUGF 1,"Fragment slot timed-out!\n"
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; TODO: clear all entry's of timed-out slot
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.try_next:
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add esi, 4
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loop .loop
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ret
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;-----------------------------------------------------------------
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;
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; Create_IPv4_Packet
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;
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; IN: eax = dest ip
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; ebx = source ip
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; ecx = data length
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; dx = fragment id
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; di = protocol
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;
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; OUT: eax = pointer to buffer start
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; ebx = pointer to device struct (needed for sending procedure)
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; ecx = unchanged (packet size of embedded data)
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; edx = size of complete buffer
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; esi = pointer to sending procedure
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; edi = pointer to start of data (-1 on error)
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;
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;----------------------------------------------------------------- ;;; TODO: create fragmented packets
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align 4
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IPv4_create_packet:
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|
|
DEBUGF 1,"Create IPv4 Packet (size=%u)\n", ecx
|
|
|
|
cmp ecx, 1480
|
|
jg .exit_
|
|
|
|
test ebx, ebx ; if dest ip = 0
|
|
jnz .ip_ok ; and local ip is valid
|
|
; use local ip instead
|
|
cmp [IP_LIST],0xffffffff ;
|
|
je .ip_ok ; TODO: find solution to send broadcast
|
|
; on device other then device 0
|
|
mov ebx, [IP_LIST] ;
|
|
;
|
|
.ip_ok: ;
|
|
|
|
push ecx eax ebx dx di
|
|
|
|
cmp eax, -1
|
|
je .broadcast ; If it is broadcast, just send
|
|
|
|
call ARP_IP_to_MAC
|
|
|
|
cmp eax, -1
|
|
je .not_found
|
|
|
|
push ebx
|
|
push ax
|
|
|
|
jmp .send
|
|
|
|
.broadcast:
|
|
push word -1
|
|
push dword -1
|
|
|
|
.send:
|
|
call IPv4_dest_to_dev
|
|
inc [IP_PACKETS_TX+4*edi]
|
|
mov edx, [ETH_DRV_LIST + 4*edi]
|
|
lea eax, [edx + ETH_DEVICE.mac]
|
|
mov ebx, esp
|
|
mov ecx, [esp+18] ;; 18 or 22 ??
|
|
add ecx, IPv4_Packet.DataOrOptional
|
|
mov di , ETHER_IPv4
|
|
call ETH_create_packet ; TODO: figure out a way to make this work with other protocols too
|
|
add esp, 6
|
|
cmp edi, -1
|
|
je .exit
|
|
|
|
mov [edi + IPv4_Packet.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header)
|
|
mov [edi + IPv4_Packet.TypeOfService], 0
|
|
xchg ch, cl
|
|
mov [edi + IPv4_Packet.TotalLength], cx
|
|
mov [edi + IPv4_Packet.FlagsAndFragmentOffset], 0x0000
|
|
mov [edi + IPv4_Packet.TimeToLive], 128
|
|
mov [edi + IPv4_Packet.HeaderChecksum], 0
|
|
pop cx
|
|
mov [edi + IPv4_Packet.Protocol], cl
|
|
pop cx
|
|
mov [edi + IPv4_Packet.Identification], cx
|
|
pop ecx
|
|
mov [edi + IPv4_Packet.SourceAddress], ecx
|
|
pop ecx
|
|
mov [edi + IPv4_Packet.DestinationAddress], ecx
|
|
|
|
push eax ebx edx
|
|
; calculate checksum
|
|
xor edx, edx
|
|
mov esi, edi
|
|
mov ecx, IPv4_Packet.DataOrOptional
|
|
call checksum_1
|
|
call checksum_2
|
|
mov [edi + IPv4_Packet.HeaderChecksum], dx
|
|
pop edx ebx eax ecx
|
|
add edi, IPv4_Packet.DataOrOptional
|
|
|
|
DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx
|
|
|
|
ret
|
|
|
|
|
|
.not_found:
|
|
DEBUGF 1,"Create IPv4 Packet - ARP entry not found!\n"
|
|
; TODO: QUEUE the packet to resend later!
|
|
.exit:
|
|
add esp, 16
|
|
.exit_:
|
|
DEBUGF 1,"Create IPv4 Packet - failed\n"
|
|
or edi, -1
|
|
ret
|
|
|
|
|
|
|
|
|
|
;---------------------------------------------------------------------------
|
|
;
|
|
; IPv4_dest_to_dev
|
|
;
|
|
; IN: Destination IP in eax
|
|
; OUT: device id in edi
|
|
;
|
|
;---------------------------------------------------------------------------
|
|
align 4
|
|
IPv4_dest_to_dev:
|
|
|
|
DEBUGF 1,"IPv4 destination to device: "
|
|
|
|
xor edi, edi
|
|
mov ecx, MAX_IP
|
|
|
|
.loop:
|
|
mov ebx, [IP_LIST+edi] ; we dont need to worry about non exisiting ip interfaces
|
|
and ebx, [SUBNET_LIST+edi] ; they have IP and SUBNET set to all one's, so they will have no match except 255.255.255.255
|
|
; (only a moron would insert that ip into this function..)
|
|
mov edx, eax
|
|
and edx, [SUBNET_LIST+edi]
|
|
|
|
cmp ebx, edx
|
|
je .found_it
|
|
|
|
add edi, 4
|
|
loop .loop
|
|
|
|
xor edi, edi ; if none found, use device 0 as default device
|
|
|
|
.found_it:
|
|
shr edi, 2
|
|
|
|
DEBUGF 1,"%u\n",edi
|
|
|
|
ret
|
|
|
|
|
|
|
|
;---------------------------------------------------------------------------
|
|
;
|
|
; IPv4_get_frgmnt_num
|
|
;
|
|
; IN: /
|
|
; OUT: fragment number in ax
|
|
;
|
|
;---------------------------------------------------------------------------
|
|
align 4
|
|
IPv4_get_frgmnt_num:
|
|
xor ax, ax ;;; TODO: replace this with real code
|
|
|
|
ret
|
|
|
|
|
|
;---------------------------------------------------------------------------
|
|
;
|
|
; IPv4_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
|
|
IPv4_API:
|
|
|
|
movzx eax, bh
|
|
shl eax, 2
|
|
|
|
test bl, bl
|
|
jz .packets_tx ; 0
|
|
dec bl
|
|
jz .packets_rx ; 1
|
|
dec bl
|
|
jz .read_ip ; 2
|
|
dec bl
|
|
jz .write_ip ; 3
|
|
dec bl
|
|
jz .read_dns ; 4
|
|
dec bl
|
|
jz .write_dns ; 5
|
|
dec bl
|
|
jz .read_subnet ; 6
|
|
dec bl
|
|
jz .write_subnet ; 7
|
|
dec bl
|
|
jz .read_gateway ; 8
|
|
dec bl
|
|
jz .write_gateway ; 9
|
|
|
|
.error:
|
|
mov eax, -1
|
|
ret
|
|
|
|
.packets_tx:
|
|
add eax, IP_PACKETS_TX
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.packets_rx:
|
|
add eax, IP_PACKETS_RX
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.read_ip:
|
|
add eax, IP_LIST
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.write_ip:
|
|
add eax, IP_LIST
|
|
mov [eax], ecx
|
|
xor eax, eax
|
|
ret
|
|
|
|
.read_dns:
|
|
add eax, DNS_LIST
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.write_dns:
|
|
add eax, DNS_LIST
|
|
mov [eax], ecx
|
|
xor eax, eax
|
|
ret
|
|
|
|
.read_subnet:
|
|
add eax, SUBNET_LIST
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.write_subnet:
|
|
add eax, SUBNET_LIST
|
|
mov [eax], ecx
|
|
xor eax, eax
|
|
ret
|
|
|
|
.read_gateway:
|
|
add eax, GATEWAY_LIST
|
|
mov eax, [eax]
|
|
ret
|
|
|
|
.write_gateway:
|
|
add eax, GATEWAY_LIST
|
|
mov [eax], ecx
|
|
xor eax, eax
|
|
ret
|
|
|
|
|
|
|
|
|