forked from KolibriOS/kolibrios
1020 lines
33 KiB
PHP
1020 lines
33 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2011. 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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MAX_FRAGMENTS equ 64
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MAX_IP equ MAX_NET_DEVICES
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IP_MAX_INTERFACES equ MAX_IP
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struct IPv4_header
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VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits]
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TypeOfService db ? ; precedence [7-5] minimize delay [4], maximize throughput [3], maximize riliability [2] minimize momentary cost [1] and zero [0]
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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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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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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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; 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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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 * sizeof.FRAGMENT_slot
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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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;-----------------------------------------------------------------
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macro IPv4_init {
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xor eax, eax
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mov edi, IP_LIST
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mov ecx, 4*MAX_IP
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rep stosd
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mov edi, FRAGMENT_LIST
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mov ecx, sizeof.FRAGMENT_slot*MAX_FRAGMENTS/4 + 2*MAX_IP
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rep stosd
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}
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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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;-----------------------------------------------------------------
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macro IPv4_decrease_fragment_ttls {
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local .loop
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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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}
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macro IPv4_checksum ptr {
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; This is the fast procedure to create or check an IP header without options
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; To create a new checksum, the checksum field must be set to 0 before computation
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; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct
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push ebx
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xor ebx, ebx
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add bl, [ptr+1]
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adc bh, [ptr+0]
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adc bl, [ptr+3]
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adc bh, [ptr+2]
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adc bl, [ptr+5]
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adc bh, [ptr+4]
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adc bl, [ptr+7]
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adc bh, [ptr+6]
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adc bl, [ptr+9]
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adc bh, [ptr+8]
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; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation
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adc bl, [ptr+13]
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adc bh, [ptr+12]
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adc bl, [ptr+15]
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adc bh, [ptr+14]
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adc bl, [ptr+17]
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adc bh, [ptr+16]
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adc bl, [ptr+19]
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adc bh, [ptr+18]
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adc ebx, 0
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push ecx
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mov ecx, ebx
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shr ecx, 16
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and ebx, 0xffff
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add ebx, ecx
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mov ecx, ebx
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shr ecx, 16
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add ebx, ecx
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not bx
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jnz .not_zero
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dec bx
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.not_zero:
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xchg bl, bh
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pop ecx
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neg word [ptr+10] ; zero will stay zero so we just get the checksum
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add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
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pop ebx
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}
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;-----------------------------------------------------------------
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;
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; IPv4_input:
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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_input: ; TODO: implement handler for IP options
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; TODO2: add code for raw sockets
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DEBUGF 1,"IPv4_Handler, packet from: %u.%u.%u.%u ",\
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[edx + IPv4_header.SourceAddress]:1,[edx + IPv4_header.SourceAddress + 1]:1,[edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1
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DEBUGF 1,"to: %u.%u.%u.%u\n",\
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[edx + IPv4_header.DestinationAddress]:1,[edx + IPv4_header.DestinationAddress + 1]:1,[edx + IPv4_header.DestinationAddress + 2]:1,[edx + IPv4_header.DestinationAddress + 3]:1
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;-------------------------------------------
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; Check if the packet still has time to live
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cmp byte [edx + IPv4_header.TimeToLive], 0
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je .dump
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;--------------------------------------
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; First, check if IP packet has options
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movzx eax, [edx + IPv4_header.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 .has_options
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;-------------------------------
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; Now, re-calculate the checksum
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IPv4_checksum edx
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jnz .dump ; if checksum isn't valid then dump packet
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DEBUGF 1,"IPv4 Checksum is correct\n"
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;-----------------------------------
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; Check if destination IP is correct
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call NET_ptr_to_num
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shl edi, 2
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; check if it matches local ip
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mov eax, [IP_LIST+edi]
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cmp [edx + IPv4_header.DestinationAddress], eax
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je .ip_ok
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; check for broadcast
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mov eax, [SUBNET_LIST+edi]
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not eax
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or eax, [IP_LIST+edi]
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cmp [edx + IPv4_header.DestinationAddress], eax
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je .ip_ok
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; or a special broadcast
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cmp [edx + IPv4_header.DestinationAddress], -1
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je .ip_ok
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; maybe it's a multicast then
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mov eax, [edx + IPv4_header.DestinationAddress]
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and eax, 0xff000000
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; cmp eax, 224 shl 24
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; je .ip_ok
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; or a loopback address
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cmp eax, 127 shl 24
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je .ip_ok
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; or it's not meant for us..
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DEBUGF 2,"Destination address does not match!\n"
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jmp .dump
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;------------------------
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; Now we can update stats
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.ip_ok:
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inc [IP_PACKETS_RX+edi]
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;----------------------------------
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; Check if the packet is fragmented
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test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ?
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jnz .has_fragments ; If so, we definately have a fragmented packet
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test [edx + IPv4_header.FlagsAndFragmentOffset], 0xff1f ; 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 .is_last_fragment
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;-------------------------------------------------------------------
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; No, it's just a regular IP packet, pass it to the higher protocols
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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 esi, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field
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and esi, 0x0000000f ;
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shl esi, 2 ;
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movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet
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xchg cl , ch ;
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sub ecx, esi ;
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lea edi, [edx + IPv4_header.SourceAddress] ; make edi ptr to source and dest IPv4 address
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mov al , [edx + IPv4_header.Protocol]
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add esi, edx ; make esi ptr to data
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cmp al , IP_PROTO_TCP
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je TCP_input
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cmp al , IP_PROTO_UDP
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je UDP_input
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cmp al , IP_PROTO_ICMP
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je ICMP_input
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DEBUGF 2,"unknown Internet protocol: %u\n", al
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.dump:
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DEBUGF 2,"IP_Handler - dumping\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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;---------------------------
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; Fragmented packet handler
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.has_fragments:
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movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset]
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xchg al , ah
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shl ax , 3
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DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_header.Identification]:4
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test ax , ax ; Is this the first packet of the fragment?
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jz .is_first_fragment
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;-------------------------------------------------------
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; We have a fragmented IP packet, but it's not the first
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DEBUGF 1,"Middle fragmented packet received!\n"
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call IPv4_find_fragment_slot
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cmp esi, -1
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je .dump
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mov [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 now 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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;------------------------------------
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; We have received the first fragment
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.is_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, sizeof.FRAGMENT_slot
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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 [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl
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mov ax , [edx + IPv4_header.Identification]
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mov [esi + FRAGMENT_slot.id], ax
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mov eax,[edx + IPv4_header.SourceAddress]
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mov [esi + FRAGMENT_slot.SrcIP], eax
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mov eax, [edx + IPv4_header.DestinationAddress]
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mov [esi + FRAGMENT_slot.DstIP], eax
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pop eax
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mov [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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;-----------------------------------
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; We have received the last fragment
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.is_last_fragment:
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DEBUGF 1,"Last fragmented packet received!\n"
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call IPv4_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, [esi + sizeof.FRAGMENT_entry + IPv4_header.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, [esi + sizeof.FRAGMENT_entry + IPv4_header.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_header.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_header.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, [edx + sizeof.FRAGMENT_entry + IPv4_header.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, [edx + sizeof.FRAGMENT_entry + IPv4_header.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 + sizeof.FRAGMENT_entry] ; Set esi to the correct begin of fragment
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movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.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 ebx, [edx + FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet
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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 [edx + IPv4_header.TotalLength], cx
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add esp, 8
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xchg cl, ch ;
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push ecx ;;;;
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push eax ;;;;
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; mov esi, edx ; This prints the IP packet to the debug board (usefull when using serial output debug..)
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; ;
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; packet_to_debug
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jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr
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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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|
; The IP packet has some options
|
|
|
|
.has_options:
|
|
jmp .dump
|
|
|
|
|
|
|
|
;-----------------------------------------------------------------
|
|
;
|
|
; find fragment slot
|
|
;
|
|
; IN: pointer to fragmented packet in edx
|
|
; OUT: pointer to slot in edi, -1 on error
|
|
;
|
|
;-----------------------------------------------------------------
|
|
align 4
|
|
IPv4_find_fragment_slot:
|
|
|
|
;;; TODO: the RFC says we should check protocol number too
|
|
|
|
push eax ebx ecx edx
|
|
mov ax , [edx + IPv4_header.Identification]
|
|
mov ecx, MAX_FRAGMENTS
|
|
mov esi, FRAGMENT_LIST
|
|
mov ebx, [edx + IPv4_header.SourceAddress]
|
|
mov edx, [edx + IPv4_header.DestinationAddress]
|
|
.find_slot:
|
|
cmp [esi + FRAGMENT_slot.id], ax
|
|
jne .try_next
|
|
cmp [esi + FRAGMENT_slot.SrcIP], ebx
|
|
jne .try_next
|
|
cmp [esi + FRAGMENT_slot.DstIP], edx
|
|
je .found_slot
|
|
.try_next:
|
|
add esi, sizeof.FRAGMENT_slot
|
|
loop .find_slot
|
|
; pop edx ebx
|
|
or esi, -1
|
|
; ret
|
|
|
|
.found_slot:
|
|
pop edx ecx ebx eax
|
|
ret
|
|
|
|
|
|
;------------------------------------------------------------------
|
|
;
|
|
; IPv4_output
|
|
;
|
|
; IN: eax = dest ip
|
|
; ebx = source ip
|
|
; ecx = data length
|
|
; dx = fragment id
|
|
; di = TTL shl 8 + protocol
|
|
;
|
|
; OUT: eax = pointer to buffer start
|
|
; ebx = pointer to device struct (needed for sending procedure)
|
|
; ecx = unchanged (packet size of embedded data)
|
|
; edx = size of complete buffer
|
|
; edi = pointer to start of data (0 on error)
|
|
;
|
|
;------------------------------------------------------------------
|
|
align 4
|
|
IPv4_output:
|
|
|
|
DEBUGF 1,"IPv4_create_packet: size=%u\n", ecx
|
|
|
|
cmp ecx, 65500 ; Max IPv4 packet size
|
|
ja .too_large
|
|
|
|
push ecx eax ebx dx di
|
|
|
|
call ARP_IP_to_MAC
|
|
|
|
test eax, 0xffff0000 ; error bits
|
|
jnz .arp_error
|
|
|
|
.continue:
|
|
|
|
push ebx ; push the mac
|
|
push ax
|
|
|
|
call IPv4_dest_to_dev
|
|
inc [IP_PACKETS_TX+edi]
|
|
mov ebx, [NET_DRV_LIST+edi]
|
|
lea eax, [ebx + ETH_DEVICE.mac]
|
|
mov edx, esp
|
|
mov ecx, [esp + 18]
|
|
add ecx, sizeof.IPv4_header
|
|
mov di , ETHER_IPv4
|
|
call ETH_output
|
|
jz .error
|
|
|
|
add esp, 6 ; pop the mac
|
|
|
|
mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header)
|
|
mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet
|
|
mov [edi + IPv4_header.TotalLength], cx
|
|
rol [edi + IPv4_header.TotalLength], 8 ; internet byte order
|
|
mov [edi + IPv4_header.FlagsAndFragmentOffset], 0x0000
|
|
mov [edi + IPv4_header.HeaderChecksum], 0
|
|
pop word [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
|
|
; [edi + IPv4_header.Protocol]
|
|
popw [edi + IPv4_header.Identification] ; fragment id
|
|
popd [edi + IPv4_header.SourceAddress]
|
|
popd [edi + IPv4_header.DestinationAddress]
|
|
|
|
pop ecx
|
|
|
|
IPv4_checksum edi
|
|
add edi, sizeof.IPv4_header
|
|
DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx
|
|
ret
|
|
|
|
.error:
|
|
add esp, 6
|
|
.arp_error:
|
|
add esp, 4+4+4+2+2
|
|
.too_large:
|
|
DEBUGF 1,"IPv4_create_packet: Failed\n"
|
|
sub edi, edi
|
|
ret
|
|
|
|
|
|
|
|
|
|
|
|
;------------------------------------------------------------------
|
|
;
|
|
; IPv4_output_raw
|
|
;
|
|
; IN: eax = socket ptr
|
|
; ecx = data length
|
|
; esi = data ptr
|
|
;
|
|
; OUT: /
|
|
;
|
|
;------------------------------------------------------------------
|
|
align 4
|
|
IPv4_output_raw:
|
|
|
|
DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax
|
|
|
|
cmp ecx, 1480 ;;;;; FIXME
|
|
ja .too_large
|
|
|
|
sub esp, 8
|
|
push esi eax
|
|
|
|
call ARP_IP_to_MAC
|
|
|
|
test eax, 0xffff0000 ; error bits
|
|
jnz .arp_error
|
|
|
|
.continue:
|
|
|
|
push ebx ; push the mac
|
|
push ax
|
|
|
|
call IPv4_dest_to_dev
|
|
inc [IP_PACKETS_TX+edi]
|
|
mov ebx, [NET_DRV_LIST+edi]
|
|
lea eax, [ebx + ETH_DEVICE.mac]
|
|
mov edx, esp
|
|
mov ecx, [esp + 6+4]
|
|
add ecx, sizeof.IPv4_header
|
|
mov di, ETHER_IPv4
|
|
call ETH_output
|
|
jz .error
|
|
|
|
add esp, 6 ; pop the mac
|
|
|
|
mov dword[esp+4+4], edx
|
|
mov dword[esp+4+4+4], eax
|
|
|
|
pop eax esi
|
|
;; todo: check socket options if we should add header, or just compute checksum
|
|
|
|
push edi ecx
|
|
rep movsb
|
|
pop ecx edi
|
|
|
|
; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header)
|
|
; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet
|
|
; [edi + IPv4_header.TotalLength]
|
|
; [edi + IPv4_header.TotalLength] ; internet byte order
|
|
; [edi + IPv4_header.FlagsAndFragmentOffset]
|
|
|
|
mov [edi + IPv4_header.HeaderChecksum], 0
|
|
|
|
; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
|
|
; [edi + IPv4_header.Protocol]
|
|
; [edi + IPv4_header.Identification] ; fragment id
|
|
; [edi + IPv4_header.SourceAddress]
|
|
; [edi + IPv4_header.DestinationAddress]
|
|
|
|
IPv4_checksum edi ;;;; todo: checksum for IP packet with options!
|
|
add edi, sizeof.IPv4_header
|
|
DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx
|
|
call [ebx + NET_DEVICE.transmit]
|
|
ret
|
|
|
|
.error:
|
|
add esp, 6
|
|
.arp_error:
|
|
add esp, 8+4+4
|
|
.too_large:
|
|
DEBUGF 1,"IPv4_output_raw: Failed\n"
|
|
sub edi, edi
|
|
ret
|
|
|
|
|
|
;--------------------------------------------------------
|
|
;
|
|
;
|
|
; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented
|
|
; dword [esp+4] = buffer size
|
|
; esi = pointer to ip header in that buffer
|
|
; ecx = max size of fragments
|
|
;
|
|
; OUT: /
|
|
;
|
|
;--------------------------------------------------------
|
|
|
|
align 4
|
|
IPv4_fragment:
|
|
|
|
DEBUGF 1,"IPv4_fragment\n"
|
|
|
|
and ecx, not 111b ; align 4
|
|
|
|
cmp ecx, sizeof.IPv4_header + 8 ; must be able to put at least 8 bytes
|
|
jb .err2
|
|
|
|
push esi ecx
|
|
mov eax, [esi + IPv4_header.DestinationAddress]
|
|
call ARP_IP_to_MAC
|
|
pop ecx esi
|
|
cmp eax, -1
|
|
jz .err2
|
|
|
|
push ebx
|
|
push ax
|
|
|
|
mov ebx, [NET_DRV_LIST]
|
|
lea eax, [ebx + ETH_DEVICE.mac]
|
|
push eax
|
|
|
|
|
|
push esi ; ptr to ip header
|
|
sub ecx, sizeof.IPv4_header ; substract header size
|
|
push ecx ; max data size
|
|
push dword 0 ; offset
|
|
|
|
.new_fragment:
|
|
DEBUGF 1,"Ipv4_fragment - new_fragmentn"
|
|
|
|
|
|
mov eax, [esp + 3*4]
|
|
lea ebx, [esp + 4*4]
|
|
mov di , ETHER_IPv4
|
|
call ETH_output
|
|
|
|
cmp edi, -1
|
|
jz .err
|
|
|
|
; copy header
|
|
mov esi, [esp + 2*4]
|
|
mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header!
|
|
rep movsd
|
|
|
|
; copy data
|
|
mov esi, [esp + 2*4]
|
|
add esi, sizeof.IPv4_header
|
|
add esi, [esp] ; offset
|
|
|
|
mov ecx, [esp + 1*4]
|
|
DEBUGF 1,"IPv4_fragment - copying data (%u bytes)\n", ecx
|
|
rep movsb
|
|
|
|
; now, correct header
|
|
mov ecx, [esp + 1*4]
|
|
add ecx, sizeof.IPv4_header
|
|
xchg cl, ch
|
|
mov [edi + IPv4_header.TotalLength], cx
|
|
|
|
mov ecx, [esp] ; offset
|
|
xchg cl, ch
|
|
|
|
; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<<
|
|
; je .last_fragment
|
|
or cx, 1 shl 2 ; more fragments
|
|
; .last_fragment:
|
|
mov [edi + IPv4_header.FlagsAndFragmentOffset], cx
|
|
|
|
mov [edi + IPv4_header.HeaderChecksum], 0
|
|
|
|
;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet
|
|
mov ecx, [esp + 1*4]
|
|
|
|
push edx eax
|
|
IPv4_checksum edi
|
|
|
|
call [ebx + NET_DEVICE.transmit]
|
|
;<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
|
|
|
|
mov ecx, [esp+4]
|
|
add [esp], ecx
|
|
|
|
mov ecx, [esp+3*4+6+4] ; ptr to begin of buff
|
|
add ecx, [esp+3*4+6+4+4] ; buff size
|
|
sub ecx, [esp+2*4] ; ptr to ip header
|
|
add ecx, [esp] ; offset
|
|
|
|
DEBUGF 1,"Ipv4_fragment - bytes remaining: %u\n", ecx
|
|
|
|
cmp ecx, [esp+1*4]
|
|
jae .new_fragment
|
|
|
|
mov [esp+4], ecx ; set fragment size to remaining packet size
|
|
jmp .new_fragment
|
|
|
|
.err:
|
|
DEBUGF 1,"Ipv4_fragment - failed\n"
|
|
.done:
|
|
add esp, 12 + 4 + 6
|
|
.err2:
|
|
DEBUGF 1,"Ipv4_fragment - dumping\n"
|
|
call kernel_free
|
|
add esp, 4
|
|
|
|
ret
|
|
|
|
|
|
|
|
;---------------------------------------------------------------------------
|
|
;
|
|
; IPv4_dest_to_dev
|
|
;
|
|
; IN: eax = Destination IP
|
|
; OUT: edi = device id * 4
|
|
;
|
|
;---------------------------------------------------------------------------
|
|
align 4
|
|
IPv4_dest_to_dev:
|
|
|
|
cmp eax, 0xffffffff
|
|
je .invalid
|
|
|
|
xor edi, edi
|
|
mov ecx, MAX_IP
|
|
|
|
.loop:
|
|
mov ebx, [IP_LIST+edi]
|
|
and ebx, [SUBNET_LIST+edi]
|
|
jz .next
|
|
|
|
mov edx, eax
|
|
and edx, [SUBNET_LIST+edi]
|
|
|
|
cmp ebx, edx
|
|
je .found_it
|
|
.next:
|
|
add edi, 4
|
|
loop .loop
|
|
|
|
.invalid:
|
|
xor edi, edi ; if none found, use device 0 as default device
|
|
|
|
.found_it:
|
|
DEBUGF 1,"IPv4_dest_to_dev: %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 |