188 lines
6.4 KiB
PHP
188 lines
6.4 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;
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;; ICMP.INC
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;;
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;; Internet Control Message Protocol ( RFC 792 )
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;;
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;; Last revision: 11.11.2006
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;;
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;; This file contains the following:
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;; icmp_rx - processes ICMP-packets received by the IP layer
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;;
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;; Changes history:
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;; 22.09.2003 - [Mike Hibbett] : mikeh@oceanfree.net
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;; 11.11.2006 - [Johnny_B] and [smb]
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;;
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;; Current status:
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;; This implemetation of ICMP proto supports message of ECHO type.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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struc ICMP_PACKET
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{ .Type db ? ;+00
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.Code db ? ;+01
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.Checksum dw ? ;+02
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.Identifier dw ? ;+04
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.SequenceNumber dw ? ;+06
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.Data db ? ;+08
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}
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virtual at 0
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ICMP_PACKET ICMP_PACKET
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end virtual
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; Example:
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; ECHO message format
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;
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;
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; 0 1 2 3
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; 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
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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; | Type | Code | Checksum |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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; | Identifier | Sequence Number |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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; | Data ...
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; +-+-+-+-+-
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;
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;
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; ICMP types & codes, RFC 792 and FreeBSD's ICMP sources
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;
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ICMP_ECHOREPLY equ 0 ; echo reply message
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ICMP_UNREACH equ 3
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ICMP_UNREACH_NET equ 0 ; bad net
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ICMP_UNREACH_HOST equ 1 ; bad host
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ICMP_UNREACH_PROTOCOL equ 2 ; bad protocol
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ICMP_UNREACH_PORT equ 3 ; bad port
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ICMP_UNREACH_NEEDFRAG equ 4 ; IP_DF caused drop
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ICMP_UNREACH_SRCFAIL equ 5 ; src route failed
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ICMP_UNREACH_NET_UNKNOWN equ 6 ; unknown net
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ICMP_UNREACH_HOST_UNKNOWN equ 7 ; unknown host
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ICMP_UNREACH_ISOLATED equ 8 ; src host isolated
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ICMP_UNREACH_NET_PROHIB equ 9 ; prohibited access
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ICMP_UNREACH_HOST_PROHIB equ 10 ; ditto
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ICMP_UNREACH_TOSNET equ 11 ; bad tos for net
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ICMP_UNREACH_TOSHOST equ 12 ; bad tos for host
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ICMP_UNREACH_FILTER_PROHIB equ 13 ; admin prohib
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ICMP_UNREACH_HOST_PRECEDENCE equ 14 ; host prec vio.
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ICMP_UNREACH_PRECEDENCE_CUTOFF equ 15 ; prec cutoff
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ICMP_SOURCEQUENCH equ 4 ; packet lost, slow down
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ICMP_REDIRECT equ 5 ; shorter route, codes:
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ICMP_REDIRECT_NET equ 0 ; for network
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ICMP_REDIRECT_HOST equ 1 ; for host
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ICMP_REDIRECT_TOSNET equ 2 ; for tos and net
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ICMP_REDIRECT_TOSHOST equ 3 ; for tos and host
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ICMP_ALTHOSTADDR equ 6 ; alternate host address
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ICMP_ECHO equ 8 ; echo service
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ICMP_ROUTERADVERT equ 9 ; router advertisement
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ICMP_ROUTERADVERT_NORMAL equ 0 ; normal advertisement
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ICMP_ROUTERADVERT_NOROUTE_COMMON equ 16 ; selective routing
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ICMP_ROUTERSOLICIT equ 10 ; router solicitation
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ICMP_TIMXCEED equ 11 ; time exceeded, code:
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ICMP_TIMXCEED_INTRANS equ 0 ; ttl==0 in transit
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ICMP_TIMXCEED_REASS equ 1 ; ttl==0 in reass
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ICMP_PARAMPROB equ 12 ; ip header bad
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ICMP_PARAMPROB_ERRATPTR equ 0 ; error at param ptr
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ICMP_PARAMPROB_OPTABSENT equ 1 ; req. opt. absent
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ICMP_PARAMPROB_LENGTH equ 2 ; bad length
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ICMP_TSTAMP equ 13 ; timestamp request
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ICMP_TSTAMPREPLY equ 14 ; timestamp reply
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ICMP_IREQ equ 15 ; information request
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ICMP_IREQREPLY equ 16 ; information reply
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ICMP_MASKREQ equ 17 ; address mask request
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ICMP_MASKREPLY equ 18 ; address mask reply
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ICMP_TRACEROUTE equ 30 ; traceroute
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ICMP_DATACONVERR equ 31 ; data conversion error
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ICMP_MOBILE_REDIRECT equ 32 ; mobile host redirect
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ICMP_IPV6_WHEREAREYOU equ 33 ; IPv6 where-are-you
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ICMP_IPV6_IAMHERE equ 34 ; IPv6 i-am-here
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ICMP_MOBILE_REGREQUEST equ 35 ; mobile registration req
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ICMP_MOBILE_REGREPLY equ 36 ; mobile registreation reply
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ICMP_SKIP equ 39 ; SKIP
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ICMP_PHOTURIS equ 40 ; Photuris
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ICMP_PHOTURIS_UNKNOWN_INDEX equ 1 ; unknown sec index
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ICMP_PHOTURIS_AUTH_FAILED equ 2 ; auth failed
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ICMP_PHOTURIS_DECRYPT_FAILED equ 3 ; decrypt failed
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;***************************************************************************
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; Function
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; icmp_rx [by Johnny_B]
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;
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; Description
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; ICMP protocol handler
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; This is a kernel function, called by ip_rx
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;
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; IN:
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; buffer_number - # of IP-buffer. This buffer must be reused or marked as empty afterwards
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; IPPacketBase - IP_PACKET base address
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; IPHeaderLength - Header length of IP_PACKET
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;
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; OUT:
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; EAX=not defined
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;
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; All used registers will be saved
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;
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;***************************************************************************
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proc icmp_rx stdcall uses ebx esi edi,\
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buffer_number:DWORD,IPPacketBase:DWORD,IPHeaderLength:DWORD
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mov esi,[IPPacketBase] ;esi=IP_PACKET base address
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mov edi, esi
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add edi,[IPHeaderLength] ;edi=ICMP_PACKET base address
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cmp byte[edi + ICMP_PACKET.Type], ICMP_ECHO ; Is this an echo request? discard if not
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jz .icmp_echo
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mov eax, [buffer_number]
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call freeBuff
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jmp .exit
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.icmp_echo:
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; swap the source and destination addresses
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mov ecx, [esi + IP_PACKET.DestinationAddress]
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mov ebx, [esi + IP_PACKET.SourceAddress]
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mov [esi + IP_PACKET.DestinationAddress], ebx
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mov [esi + IP_PACKET.SourceAddress], ecx
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; recalculate the IP header checksum
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mov eax,[IPHeaderLength]
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stdcall checksum_jb,esi,eax ;buf_ptr,buf_size
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mov byte[esi + IP_PACKET.HeaderChecksum], ah
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mov byte[esi + IP_PACKET.HeaderChecksum + 1], al ; ?? correct byte order?
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mov byte[edi + ICMP_PACKET.Type], ICMP_ECHOREPLY ; change the request to a response
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mov word[edi + ICMP_PACKET.Checksum], 0 ; clear ICMP checksum prior to re-calc
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; Calculate the length of the ICMP data ( IP payload)
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xor eax, eax
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mov ah, byte[esi + IP_PACKET.TotalLength]
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mov al, byte[esi + IP_PACKET.TotalLength + 1]
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sub ax, word[IPHeaderLength] ;ax=ICMP-packet length
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stdcall checksum_jb,edi,eax ;buf_ptr,buf_size
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mov byte[edi + ICMP_PACKET.Checksum], ah
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mov byte[edi + ICMP_PACKET.Checksum + 1], al
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; Queue packet for transmission
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mov ebx, [buffer_number]
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mov eax, NET1OUT_QUEUE
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call queue
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.exit:
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ret
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endp |