$Revision: 431 $ ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;; ;; Distributed under terms of the GNU General Public License ;; ;; ;; ;; ICMP.INC ;; ;; ;; ;; Internet Control Message Protocol ( RFC 792 ) ;; ;; ;; ;; Last revision: 11.11.2006 ;; ;; ;; ;; This file contains the following: ;; ;; icmp_rx - processes ICMP-packets received by the IP layer ;; ;; ;; ;; Changes history: ;; ;; 22.09.2003 - [Mike Hibbett] : mikeh@oceanfree.net ;; ;; 11.11.2006 - [Johnny_B] and [smb] ;; ;; ;; ;; Current status: ;; ;; This implemetation of ICMP proto supports message of ECHO type. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; struc ICMP_PACKET { .Type db ? ;+00 .Code db ? ;+01 .Checksum dw ? ;+02 .Identifier dw ? ;+04 .SequenceNumber dw ? ;+06 .Data db ? ;+08 } virtual at 0 ICMP_PACKET ICMP_PACKET end virtual ; Example: ; ECHO message format ; ; ; 0 1 2 3 ; 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ; | Type | Code | Checksum | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ; | Identifier | Sequence Number | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ; | Data ... ; +-+-+-+-+- ; ; ; ICMP types & codes, RFC 792 and FreeBSD's ICMP sources ; 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 ;*************************************************************************** ; Function ; icmp_rx [by Johnny_B] ; ; Description ; ICMP protocol handler ; This is a kernel function, called by ip_rx ; ; IN: ; buffer_number - # of IP-buffer. This buffer must be reused or marked as empty afterwards ; IPPacketBase - IP_PACKET base address ; IPHeaderLength - Header length of IP_PACKET ; ; OUT: ; EAX=not defined ; ; All used registers will be saved ; ;*************************************************************************** proc icmp_rx stdcall uses ebx esi edi,\ buffer_number:DWORD,IPPacketBase:DWORD,IPHeaderLength:DWORD mov esi,[IPPacketBase] ;esi=IP_PACKET base address mov edi, esi add edi,[IPHeaderLength] ;edi=ICMP_PACKET base address cmp byte[edi + ICMP_PACKET.Type], ICMP_ECHO ; Is this an echo request? discard if not jz .icmp_echo mov eax, [buffer_number] call freeBuff jmp .exit .icmp_echo: ; swap the source and destination addresses mov ecx, [esi + IP_PACKET.DestinationAddress] mov ebx, [esi + IP_PACKET.SourceAddress] mov [esi + IP_PACKET.DestinationAddress], ebx mov [esi + IP_PACKET.SourceAddress], ecx ; recalculate the IP header checksum mov eax,[IPHeaderLength] stdcall checksum_jb,esi,eax ;buf_ptr,buf_size mov byte[esi + IP_PACKET.HeaderChecksum], ah mov byte[esi + IP_PACKET.HeaderChecksum + 1], al ; ?? correct byte order? mov byte[edi + ICMP_PACKET.Type], ICMP_ECHOREPLY ; change the request to a response mov word[edi + ICMP_PACKET.Checksum], 0 ; clear ICMP checksum prior to re-calc ; Calculate the length of the ICMP data ( IP payload) xor eax, eax mov ah, byte[esi + IP_PACKET.TotalLength] mov al, byte[esi + IP_PACKET.TotalLength + 1] sub ax, word[IPHeaderLength] ;ax=ICMP-packet length stdcall checksum_jb,edi,eax ;buf_ptr,buf_size mov byte[edi + ICMP_PACKET.Checksum], ah mov byte[edi + ICMP_PACKET.Checksum + 1], al ; Queue packet for transmission mov ebx, [buffer_number] mov eax, NET1OUT_QUEUE call queue .exit: ret endp