Subversion Repositories Kolibri OS

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;;                                                                 ;;

;; Copyright (C) KolibriOS team 2004-2010. 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: 1519 $

; 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_input:

;

;  This procedure will send reply's to ICMP echo's

;   and insert packets into sockets when needed

;

;  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_input:

;;; 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

;;; TODO: check checksum!

	DEBUGF	1,"ICMP_Handler - echo request\n"

	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	NET_ptr_to_num

	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

	call	[ebx + NET_DEVICE.transmit]

	ret

       .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.NextPtr]

	or	esi, esi

	jz	.dump

	cmp	[esi + SOCKET.Type], IP_PROTO_ICMP

	jne	.next_socket

	cmp	[esi + 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.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_input

       .dump:

	DEBUGF	1,"ICMP_Handler - dumping\n"

	call	kernel_free

	add	esp, 4 ; pop (balance stack)

	ret

;-----------------------------------------------------------------

;

; ICMP_output

;

; IN:  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_output:

	DEBUGF	1,"Creating ICMP Packet\n"

	push	esi edi edx

	add	ecx, ICMP_Packet.Data

	mov	di , IP_PROTO_ICMP

	shr	edx, 16

	call	IPv4_create_packet

	jz	.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

	push	edx edi

	DEBUGF	1,"Sending ICMP Packet\n"

	call	[ebx + NET_DEVICE.transmit]

	ret

  .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