Subversion Repositories Kolibri OS

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;;                                                                 ;;

;; 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: 1257 $

; 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 - start\n"

	cmp	byte [edx + ICMP_Packet.Type], ICMP_ECHO		    ; Is this an echo request?

	jne	.check_sockets

	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