;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2009. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; ICMP.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: 1473 $
; ICMP types & codes
ICMP_ECHOREPLY equ 0 ; echo reply message
ICMP_UNREACH equ 3
ICMP_UNREACH_NET equ 0 ; bad net
ICMP_UNREACH_HOST equ 1 ; bad host
ICMP_UNREACH_PROTOCOL equ 2 ; bad protocol
ICMP_UNREACH_PORT equ 3 ; bad port
ICMP_UNREACH_NEEDFRAG equ 4 ; IP_DF caused drop
ICMP_UNREACH_SRCFAIL equ 5 ; src route failed
ICMP_UNREACH_NET_UNKNOWN equ 6 ; unknown net
ICMP_UNREACH_HOST_UNKNOWN equ 7 ; unknown host
ICMP_UNREACH_ISOLATED equ 8 ; src host isolated
ICMP_UNREACH_NET_PROHIB equ 9 ; prohibited access
ICMP_UNREACH_HOST_PROHIB equ 10 ; ditto
ICMP_UNREACH_TOSNET equ 11 ; bad tos for net
ICMP_UNREACH_TOSHOST equ 12 ; bad tos for host
ICMP_UNREACH_FILTER_PROHIB equ 13 ; admin prohib
ICMP_UNREACH_HOST_PRECEDENCE equ 14 ; host prec vio.
ICMP_UNREACH_PRECEDENCE_CUTOFF equ 15 ; prec cutoff
ICMP_SOURCEQUENCH equ 4 ; Packet lost, slow down
ICMP_REDIRECT equ 5 ; shorter route, codes:
ICMP_REDIRECT_NET equ 0 ; for network
ICMP_REDIRECT_HOST equ 1 ; for host
ICMP_REDIRECT_TOSNET equ 2 ; for tos and net
ICMP_REDIRECT_TOSHOST equ 3 ; for tos and host
ICMP_ALTHOSTADDR equ 6 ; alternate host address
ICMP_ECHO equ 8 ; echo service
ICMP_ROUTERADVERT equ 9 ; router advertisement
ICMP_ROUTERADVERT_NORMAL equ 0 ; normal advertisement
ICMP_ROUTERADVERT_NOROUTE_COMMON equ 16 ; selective routing
ICMP_ROUTERSOLICIT equ 10 ; router solicitation
ICMP_TIMXCEED equ 11 ; time exceeded, code:
ICMP_TIMXCEED_INTRANS equ 0 ; ttl==0 in transit
ICMP_TIMXCEED_REASS equ 1 ; ttl==0 in reass
ICMP_PARAMPROB equ 12 ; ip header bad
ICMP_PARAMPROB_ERRATPTR equ 0 ; error at param ptr
ICMP_PARAMPROB_OPTABSENT equ 1 ; req. opt. absent
ICMP_PARAMPROB_LENGTH equ 2 ; bad length
ICMP_TSTAMP equ 13 ; timestamp request
ICMP_TSTAMPREPLY equ 14 ; timestamp reply
ICMP_IREQ equ 15 ; information request
ICMP_IREQREPLY equ 16 ; information reply
ICMP_MASKREQ equ 17 ; address mask request
ICMP_MASKREPLY equ 18 ; address mask reply
ICMP_TRACEROUTE equ 30 ; traceroute
ICMP_DATACONVERR equ 31 ; data conversion error
ICMP_MOBILE_REDIRECT equ 32 ; mobile host redirect
ICMP_IPV6_WHEREAREYOU equ 33 ; IPv6 where-are-you
ICMP_IPV6_IAMHERE equ 34 ; IPv6 i-am-here
ICMP_MOBILE_REGREQUEST equ 35 ; mobile registration req
ICMP_MOBILE_REGREPLY equ 36 ; mobile registreation reply
ICMP_SKIP equ 39 ; SKIP
ICMP_PHOTURIS equ 40 ; Photuris
ICMP_PHOTURIS_UNKNOWN_INDEX equ 1 ; unknown sec index
ICMP_PHOTURIS_AUTH_FAILED equ 2 ; auth failed
ICMP_PHOTURIS_DECRYPT_FAILED equ 3 ; decrypt failed
struct ICMP_Packet
.Type db ?
.Code db ?
.Checksum dw ?
.Identifier dw ?
.SequenceNumber dw ?
.Data:
ends
align 4
uglobal
ICMP_PACKETS_TX rd MAX_IP
ICMP_PACKETS_RX rd MAX_IP
endg
;-----------------------------------------------------------------
;
; ICMP_init
;
; This function resets all ICMP variables
;
; IN: /
; OUT: /
;
;-----------------------------------------------------------------
align 4
ICMP_init:
xor eax, eax
mov edi, ICMP_PACKETS_TX
mov ecx, 2*MAX_IP
rep stosd
ret
;-----------------------------------------------------------------
;
; ICMP_Handler:
;
; this procedure will send reply's to ICMP echo's
; and insert packets into sockets when needed ;;; TODO: update this to work with fragmented packets too!
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; pointer to device struct in ebx
; ICMP Packet size in ecx
; pointer to ICMP Packet data in edx
; OUT: /
;
;-----------------------------------------------------------------
align 4
ICMP_handler: ;TODO: works only on pure ethernet right now !
DEBUGF 1,"ICMP_Handler - buf:%x size:%x dev:%x, size:%x, buf:%x\n", [esp], [esp+4], ebx, ecx, edx
cmp byte [edx + ICMP_Packet.Type], ICMP_ECHO ; Is this an echo request?
jne .check_sockets
;;; TODO: check checksum!
DEBUGF 1,"ICMP_Handler - is echo request, through device:%x\n", ebx
mov byte [edx + ICMP_Packet.Type], ICMP_ECHOREPLY ; Change Packet type to reply
mov word [edx + ICMP_Packet.Checksum], 0 ; Set checksum to 0, needed to calculate new checksum
call ETH_struc2dev
cmp edi,-1
je .dump
inc [ICMP_PACKETS_RX+4*edi]
inc [ICMP_PACKETS_TX+4*edi]
; exchange dest and source address in IP header
; exchange dest and source MAC in ETH header
mov esi, [esp]
mov eax, dword [esi + ETH_FRAME.DstMAC]
mov ecx, dword [esi + ETH_FRAME.SrcMAC]
mov dword [esi + ETH_FRAME.SrcMAC], eax
mov dword [esi + ETH_FRAME.DstMAC], ecx
mov ax, word [esi + ETH_FRAME.DstMAC + 4]
mov cx, word [esi + ETH_FRAME.SrcMAC + 4]
mov word [esi + ETH_FRAME.SrcMAC + 4], ax
mov word [esi + ETH_FRAME.DstMAC + 4], cx
mov eax, dword [esi + ETH_FRAME.Data + IPv4_Packet.SourceAddress]
mov ecx, dword [esi + ETH_FRAME.Data + IPv4_Packet.DestinationAddress]
mov dword [esi + ETH_FRAME.Data + IPv4_Packet.DestinationAddress], eax
mov dword [esi + ETH_FRAME.Data + IPv4_Packet.SourceAddress], ecx
; Recalculate ip header checksum
add esi, ETH_FRAME.Data ; Point esi to start of IP Packet
movzx ecx, byte [esi + IPv4_Packet.VersionAndIHL] ; Calculate IP Header length by using IHL field
and ecx, 0x0000000F ;
shl cx , 2
push ebx edx ecx esi
xor edx, edx
call checksum_1
call checksum_2
pop esi
mov word [esi + IPv4_Packet.HeaderChecksum], dx ; Store it in the IP Packet header
; Recalculate ICMP CheckSum
movzx eax, word[esi + IPv4_Packet.TotalLength] ; Find length of IP Packet
xchg ah , al ;
sub eax, [esp] ; Now we know the length of ICMP data in eax
mov ecx, eax
mov esi, [esp + 4]
xor edx, edx
call checksum_1
call checksum_2
mov ax , dx
pop ecx edx ebx
mov word [edx + ICMP_Packet.Checksum], ax
jmp ETH_sender ; Send the reply
.check_sockets:
; TODO: validate the header & checksum.
; Look for an open ICMP socket
mov esi, net_sockets
.try_more:
mov ax , [edx + ICMP_Packet.Identifier]
.next_socket:
mov esi, [esi + SOCKET_head.NextPtr]
or esi, esi
jz .dump
cmp [esi + SOCKET_head.Type], IP_PROTO_ICMP
jne .next_socket
cmp [esi + SOCKET_head.end + IPv4_SOCKET.end + ICMP_SOCKET.Identifier], ax
jne .next_socket
call IPv4_dest_to_dev
cmp edi,-1
je .dump
inc [ICMP_PACKETS_RX+4*edi]
DEBUGF 1,"Found valid ICMP packet for socket %x\n", esi
lea ebx, [esi + SOCKET_head.lock]
call wait_mutex
; Now, assign data to socket. We have socket address in esi.
; We have ICMP Packet in edx
; number of bytes in ecx
mov eax, esi
pop esi
add esp, 4
sub edx, esi
mov edi, edx
jmp socket_internal_receiver
.dump:
DEBUGF 1,"ICMP_Handler - dumping\n"
call kernel_free
add esp, 4 ; pop (balance stack)
ret
;-----------------------------------------------------------------
;
; ICMP_Handler_fragments:
;
; Called by IP_handler,
; this procedure will send reply's to ICMP echo's etc
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; pointer to device struct in ebx
; ICMP Packet size in ecx
; pointer to ICMP Packet data in edx
; OUT: /
;
;-----------------------------------------------------------------
align 4
ICMP_handler_fragments: ; works only on pure ethernet right now !
DEBUGF 1,"ICMP_Handler_fragments - start\n"
cmp ecx, 65500
jg .dump
cmp byte [edx + ICMP_Packet.Type], ICMP_ECHO ; Is this an echo request? discard if not
jne .dump
mov esi, [esp]
sub ecx, ICMP_Packet.Data
mov eax, [esi + IPv4_Packet.SourceAddress]
mov ebx, [esi + IPv4_Packet.DestinationAddress]
push word [esi + IPv4_Packet.Identification]
mov di , [edx + ICMP_Packet.Identifier]
shl edi, 16
mov di , [edx + ICMP_Packet.SequenceNumber]
mov esi, edx
add esi, ICMP_Packet.Data
pop dx
shl edx, 16
mov dx , ICMP_ECHOREPLY shl 8 + 0 ; Type + Code
call ICMP_create_packet
.dump:
DEBUGF 1,"ICMP_Handler_fragments - end\n"
call kernel_free
add esp, 4 ; pop (balance stack)
ret
;-----------------------------------------------------------------
;
; Note: ICMP only works on top of IP protocol :)
;
; inputs:
;
; eax = dest ip
; ebx = source ip
; ecx = data length
; dh = type
; dl = code
; high 16 bits of edx = fragment id (for IP header)
; esi = data offset
; edi = identifier shl 16 + sequence number
;
;-----------------------------------------------------------------
align 4
ICMP_create_packet:
DEBUGF 1,"Create ICMP Packet\n"
push esi edi edx
add ecx, ICMP_Packet.Data
mov di , IP_PROTO_ICMP
shr edx, 16
call IPv4_create_packet
cmp edi, -1
je .exit
DEBUGF 1,"full icmp packet size: %u\n", edx
pop eax
mov word [edi + ICMP_Packet.Type], ax ; Write both type and code bytes at once
pop eax
mov [edi + ICMP_Packet.SequenceNumber], ax
shr eax, 16
mov [edi + ICMP_Packet.Identifier], ax
mov [edi + ICMP_Packet.Checksum], 0
push eax ebx ecx edx
mov esi, edi
xor edx, edx
call checksum_1
call checksum_2
mov [edi + ICMP_Packet.Checksum], dx
pop edx ecx ebx eax esi
sub ecx, ICMP_Packet.Data
add edi, ICMP_Packet.Data
push cx
shr cx , 2
rep movsd
pop cx
and cx , 3
rep movsb
sub edi, edx ;; TODO: find a better way to remember start of packet
mov ecx, [ebx + ETH_DEVICE.transmit]
push edx edi ecx
DEBUGF 1,"Sending ICMP Packet\n"
ret ; Send the packet (create_packet routine outputs pointer to routine to send packet in eax)
.exit:
DEBUGF 1,"Creating ICMP Packet failed\n"
add esp, 3*4
ret
;-----------------------------------------------------------------
;
; ICMP_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
ICMP_API:
movzx eax, bh
shl eax, 2
test bl, bl
jz .packets_tx ; 0
dec bl
jz .packets_rx ; 1
.error:
mov eax, -1
ret
.packets_tx:
add eax, ICMP_PACKETS_TX
mov eax, [eax]
ret
.packets_rx:
add eax, ICMP_PACKETS_RX
mov eax, [eax]
ret