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602924a5b5
kolibrios/kernel/branches/net/network/IPv4.inc
hidnplayr 602924a5b5 compile netcfg on unix 
fixed bug in netcfg created in last revision
netcfg gives error msg when driver is not loaded
zeroconfig now works with latest version of libini
also fixed use of static and link-local ip in zeroconfig
initial IPv4 variables are now 0.0.0.0 instead of 255.255.255.255
created kernel function that shows number of active network devices 
fixed the use of temp mac variable in IPV4.inc (variable is now in stack)
rewrite of ARP code, needs full testing/debugging (new application needed: ARP manager)
port numbers are now in INET byte order, as is in posix standards

git-svn-id: svn://kolibrios.org@1196 a494cfbc-eb01-0410-851d-a64ba20cac60
2009-10-05 20:47:27 +00:00

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2009. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; IP.INC ;;
;; ;;
;; Part of the tcp/ip network stack for KolibriOS ;;
;; ;;
;; Based on the work of [Johnny_B] and [smb] ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 922 $
; IP underlying protocols numbers
ETHER_IPv4 equ 0x0008 ; Reversed from 0800 for intel
MAX_FRAGMENTS equ 16
MAX_IP equ MAX_NET_DEVICES
struct IPv4_Packet
.VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits]
.TypeOfService db ?
.TotalLength dw ?
.Identification dw ?
.FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15]
.TimeToLive db ? ;
.Protocol db ?
.HeaderChecksum dw ?
.SourceAddress dd ?
.DestinationAddress dd ?
.DataOrOptional:
ends
struct FRAGMENT_slot
.ttl dw ? ; Time to live for this entry, 0 for empty slot's
.id dw ? ; Identification field from IP header
.SrcIP dd ? ; .. from IP header
.DstIP dd ? ; .. from IP header
.ptr dd ? ; Pointer to first packet
.size:
ends
struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets
.PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet)
.NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet)
.Owner dd ? ; Pointer to structure of driver
rb 2 ; to match ethernet header size
.Data: ; Ip header begins here (we will need the IP header to re-construct the complete packet)
ends
align 4
uglobal
BROADCAST dd ?
IP_LIST rd MAX_IP
SUBNET_LIST rd MAX_IP
DNS_LIST rd MAX_IP
GATEWAY_LIST rd MAX_IP
IP_PACKETS_TX rd MAX_IP
IP_PACKETS_RX rd MAX_IP
FRAGMENT_LIST rb MAX_FRAGMENTS*FRAGMENT_slot.size
endg
;-----------------------------------------------------------------
;
; IPv4_init
;
; This function resets all IP variables
;
; IN: /
; OUT: /
;
;-----------------------------------------------------------------
align 4
IPv4_init:
or eax, -1
mov edi, BROADCAST
stosd
xor eax, eax
mov ecx, 4*MAX_IP
rep stosd
xor eax, eax
mov edi, FRAGMENT_LIST
mov ecx, FRAGMENT_slot.size*MAX_FRAGMENTS/4 + 2*MAX_IP
rep stosd
ret
;-----------------------------------------------------------------
;
; IP_Handler:
;
; Called by eth_handler,
; will check if IP Packet isnt damaged
; and call appropriate handler. (TCP/UDP/ICMP/..)
;
; It will also re-construct fragmented packets
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; pointer to device struct in ebx
; pointer to IP Packet data in edx
; OUT: /
;
;-----------------------------------------------------------------
align 4
IPv4_handler:
DEBUGF 1,"IP_Handler - start\n"
mov cx , [edx + IPv4_Packet.HeaderChecksum]
xchg ch , cl ; Get the checksum in intel format
mov word [edx + IPv4_Packet.HeaderChecksum], 0 ; Clear checksum field to recalculating checksum
movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field
and eax, 0x0000000F ;
shl eax, 2 ;
push edx
stdcall checksum_jb, edx, eax ; buf_ptr, buf_size
pop edx
cmp cx , ax
jnz .dump ; if CHECKSUM isn't valid then dump Packet
mov eax, [edx + IPv4_Packet.DestinationAddress]
mov edi, BROADCAST
mov ecx, MAX_IP+1
repnz scasd
jz .ip_ok
not eax
test eax, 127 shl 24 ; 127.x.x.x
jz .ip_ok
; TODO: we need to check for broadcasts (other then 255.255.255.255)
jmp .dump
.ip_ok:
call ETH_struc2dev ; TODO: make this work on other protocols too!
inc [IP_PACKETS_RX+4*edi]
DEBUGF 1,"IP_Handler - packet from %u.%u.%u.%u\n",\
[edx + IPv4_Packet.SourceAddress]:1,[edx + IPv4_Packet.SourceAddress + 1]:1,[edx + IPv4_Packet.SourceAddress + 2]:1,[edx + IPv4_Packet.SourceAddress + 3]:1
mov al , [edx + IPv4_Packet.VersionAndIHL]
and al , 0x0f ; get IHL(header length)
cmp al , 0x05 ; IHL!= 5*4(20 bytes)
jnz .dump ; TODO: dont dump packets wich have optional fiels !!! /!\
cmp byte [edx + IPv4_Packet.TimeToLive], 0
je .dump
movzx eax, word [edx + IPv4_Packet.FlagsAndFragmentOffset]
xchg al , ah
test ax , 1 shl 13 ; Is 'more fragments' flag set ?
jnz .yes_fragments ; If so, we definately have a fragmented packet
test ax , 0x1fff ; If flag is not set, but there is a fragment offset, the packet is last in series of fragmented packets
jnz .last_fragment
.handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed
movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field
and eax, 0x0000000F ;
shl eax, 2 ;
movzx ecx, word [edx + IPv4_Packet.TotalLength] ; Calculate length of encapsulated Packet
xchg cl , ch ;
sub ecx, eax ;
add eax, edx
push eax
mov al , [edx + IPv4_Packet.Protocol]
pop edx ; Offset to data (tcp/udp/icmp/.. Packet)
cmp al , IP_PROTO_TCP
; je TCP_handler
cmp al , IP_PROTO_UDP
je UDP_handler
cmp al , IP_PROTO_ICMP
je ICMP_handler
DEBUGF 1,"IP_Handler - unknown protocol:%u\n",al
.dump:
DEBUGF 1,"IP_Handler - done\n"
; inc [dumped_rx_count]
call kernel_free
add esp, 4 ; pop (balance stack)
ret
.yes_fragments:
shl ax , 3
DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_Packet.Identification]:4
test ax , ax ; Is this the first packet of the fragment?
jnz .not_first_fragment
DEBUGF 1,"First fragmented packet received!\n"
; try to locate a free slot..
mov ecx, MAX_FRAGMENTS
mov esi, FRAGMENT_LIST
.find_free_slot:
cmp word [esi + FRAGMENT_slot.ttl], 0
je .found_free_slot
add esi, FRAGMENT_slot.size
loop .find_free_slot
jmp .dump ; If no free slot was found, dump the packet
.found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure
mov word [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl
mov ax , word [edx + IPv4_Packet.Identification]
mov word [esi + FRAGMENT_slot.id], ax
mov eax, dword [edx + IPv4_Packet.SourceAddress]
mov dword [esi + FRAGMENT_slot.SrcIP], eax
mov eax, dword [edx + IPv4_Packet.DestinationAddress]
mov dword [esi + FRAGMENT_slot.DstIP], eax
pop eax
mov dword [esi + FRAGMENT_slot.ptr], eax
; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure
mov [eax + FRAGMENT_entry.NextPtr], -1
mov [eax + FRAGMENT_entry.PrevPtr], -1
mov [eax + FRAGMENT_entry.Owner], ebx
add esp, 4 ; balance stack and exit
ret
.not_first_fragment:
DEBUGF 1,"Middle fragmented packet received!\n"
call .find_fragment_slot
cmp esi, -1
je .dump
mov word [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl
mov esi, [esi + FRAGMENT_slot.ptr]
or edi, -1
.find_last_entry: ; The following routine will try to find the last entry
cmp edi, [esi + FRAGMENT_entry.PrevPtr]
jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
mov edi, esi
mov esi, [esi + FRAGMENT_entry.NextPtr]
cmp esi, -1
jne .find_last_entry
; We found the last entry (pointer is noww in edi)
; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure
pop eax ; pointer to packet
mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry
mov [eax + FRAGMENT_entry.NextPtr], -1
mov [eax + FRAGMENT_entry.PrevPtr], edi
mov [eax + FRAGMENT_entry.Owner], ebx
add esp, 4
ret
.last_fragment:
DEBUGF 1,"Last fragmented packet received!\n"
call .find_fragment_slot
cmp esi, -1
je .dump
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
push esi
xor eax, eax ;
or edi, -1
.count_bytes:
cmp [esi + FRAGMENT_entry.PrevPtr], edi
jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
mov cx, word [esi + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Add total length
xchg cl, ch
DEBUGF 1,"Packet size: %u\n", cx
add ax, cx
movzx cx, byte [esi + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Sub Header length
and cx, 0x000F
shl cx, 2
DEBUGF 1,"Header size: %u\n", cx
sub ax, cx
mov edi, esi
mov esi, [esi + FRAGMENT_entry.NextPtr]
cmp esi, -1
jne .count_bytes
mov esi, [esp+4] ;;;
mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code
mov [esi + FRAGMENT_entry.NextPtr], -1
mov [esi + FRAGMENT_entry.PrevPtr], edi
mov [esi + FRAGMENT_entry.Owner], ebx
mov cx, [edx + IPv4_Packet.TotalLength] ; Note: This time we dont substract Header length
xchg cl , ch
DEBUGF 1,"Packet size: %u\n", cx
add ax , cx
DEBUGF 1,"Total Received data size: %u\n", eax
push eax
mov ax , [edx + IPv4_Packet.FlagsAndFragmentOffset]
xchg al , ah
shl ax , 3
add cx , ax
pop eax
DEBUGF 1,"Total Fragment size: %u\n", ecx
cmp ax, cx
jne .destroy_slot_pop
push eax
push eax
call kernel_alloc
test eax, eax
je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot
mov edx, [esp+4] ; Get pointer to first fragment entry back in edx
.rebuild_packet_loop:
movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.FlagsAndFragmentOffset] ; Calculate the fragment offset
xchg cl , ch ; intel byte order
shl cx , 3 ; multiply by 8 and clear first 3 bits
DEBUGF 1,"Fragment offset: %u\n", cx
lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment
movzx ebx, byte [edx + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Find header size (in ebx) of fragment
and bx , 0x000F ;
shl bx , 2 ;
lea esi, [edx + FRAGMENT_entry.Data] ; Set esi to the correct begin of fragment
movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Calculate total length of fragment
xchg cl, ch ; intel byte order
cmp edi, eax ; Is this packet the first fragment ?
je .first_fragment
sub cx, bx ; If not, dont copy the header
add esi, ebx ;
.first_fragment:
push cx ; First copy dword-wise, then byte-wise
shr cx, 2 ;
rep movsd ;
pop cx ;
and cx, 3 ;
rep movsb ;
push eax
push edx ; Push pointer to fragment onto stack
mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer
call kernel_free ; free the previous fragment buffer (this uses the value from stack)
pop eax
cmp edx, -1 ; Check if it is last fragment in chain
jne .rebuild_packet_loop
pop ecx ;
xchg cl, ch
mov edx, eax
mov word [edx + IPv4_Packet.TotalLength], cx
add esp, 8
xchg cl, ch ; This prints the IP packet to the debug board (usefull when using serial output debug..)
push ecx ;;;;
push eax ;;;;
; mov esi, edx ;
; ;
; @@: ;
; lodsb ;
; DEBUGF 1,"%x ", eax:2 ;
; loop @r ;
movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field
and ax, 0x000F ;
shl ax, 2 ;
sub ecx, eax ;
add eax, edx
push eax
mov al , [edx + IPv4_Packet.Protocol]
pop edx ; Offset to data (tcp/udp/icmp/.. Packet)
cmp al , IP_PROTO_TCP
; je TCP_handler
cmp al , IP_PROTO_UDP
je UDP_handler
cmp al , IP_PROTO_ICMP
je ICMP_handler_fragments
DEBUGF 1,"IP_Handler - unknown protocol:%u\n",al
call kernel_free
add esp, 8 ; pop (balance stack)
ret
.destroy_slot_pop:
add esp, 4
.destroy_slot:
DEBUGF 1,"Destroy fragment slot!\n"
; TODO!
jmp .dump
;-----------------------------------------------------------------
;
; find fragment slot
;
; IN: pointer to fragmented packet in edx ; TODO: the RFC says we should check protocol too
; OUT: pointer to slot in edi, -1 on error
;
;-----------------------------------------------------------------
.find_fragment_slot:
push eax ebx ecx edx
mov ax , word [edx + IPv4_Packet.Identification]
mov ecx, MAX_FRAGMENTS
mov esi, FRAGMENT_LIST
mov ebx, dword [edx + IPv4_Packet.SourceAddress]
mov edx, dword [edx + IPv4_Packet.DestinationAddress]
.find_slot:
cmp word [esi + FRAGMENT_slot.id], ax
jne .try_next
cmp dword [esi + FRAGMENT_slot.SrcIP], ebx
jne .try_next
cmp dword [esi + FRAGMENT_slot.DstIP], edx
je .found_slot
.try_next:
add esi, FRAGMENT_slot.size
loop .find_slot
; pop edx ebx
or esi, -1
; ret
.found_slot:
pop edx ecx ebx eax
ret
;-----------------------------------------------------------------
;
; Decrease TimeToLive of all fragment slots
;
; IN: /
; OUT: /
;
;-----------------------------------------------------------------
align 4
IPv4_decrease_fragment_ttls:
mov esi, FRAGMENT_LIST
mov ecx, MAX_FRAGMENTS
.loop:
cmp [esi + FRAGMENT_slot.ttl], 0
je .try_next
dec [esi + FRAGMENT_slot.ttl]
jnz .try_next
DEBUGF 1,"Fragment slot timed-out!\n"
; TODO: clear all entry's of timed-out slot
.try_next:
add esi, 4
loop .loop
ret
;-----------------------------------------------------------------
;
; Create_IPv4_Packet
;
; IN: eax = dest ip
; ebx = source ip
; ecx = data length
; dx = fragment id
; di = protocol
;
; OUT: eax points to buffer start
; ebx is size of complete buffer
; edi = pointer to start of data (-1 on error)
; ecx = unchanged (packet size of embedded data)
; edx = pointer to device struct (needed for sending procedure)
; esi = pointer to sending procedure
;
;-----------------------------------------------------------------
;;; TODO: create fragmented packets
align 4
IPv4_create_packet:
DEBUGF 1,"Create IPv4 Packet\n"
cmp ecx, 1514
jg .exit_
cmp eax, -1
je .broadcast ; If it is broadcast, just send
call ARP_IP_to_MAC
cmp eax, -1
jne .found
DEBUGF 1,"Create IPv4 Packet - ARP entry not found!\n"
; TODO: QUEUE!
or edi, -1
ret
.found:
push ax
push ebx
jmp .send
.broadcast:
push word -1
push dword -1
.send:
push ecx eax ebx dx di
call IPv4_dest_to_dev
inc [IP_PACKETS_TX+4*edi]
mov edi, [ETH_DRV_LIST + 4*edi]
lea eax, [edi + ETH_DEVICE.mac]
lea ebx, [esp+16]
mov ecx, [esp+12]
add ecx, IPv4_Packet.DataOrOptional
mov edx, edi ;;;
mov di , ETHER_IPv4
call ETH_create_Packet ; TODO: figure out a way to make this work with other protocols too
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
stdcall checksum_jb, edi, IPv4_Packet.DataOrOptional ; buf_ptr, buf_size
xchg al, ah
mov [edi + IPv4_Packet.HeaderChecksum], ax
pop eax ecx
add edi, IPv4_Packet.DataOrOptional
DEBUGF 1,"IPv4 Packet for device %x created successfully\n", edx
add esp, 6
ret
.exit:
add esp, 16+6
.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
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