| 0,0 → 1,188 |
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| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| ;; |
| ;; 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 |