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kolibrios/kernel/branches/net/network/icmp.inc
hidnplayr 714722b812 ICMP checksum validation + cleanup of echo reply code 
git-svn-id: svn://kolibrios.org@1544 a494cfbc-eb01-0410-851d-a64ba20cac60
2010-08-01 14:47:24 +00:00

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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 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
; 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
;
;-----------------------------------------------------------------
macro ICMP_init {
xor eax, eax
mov edi, ICMP_PACKETS_TX
mov ecx, 2*MAX_IP
rep stosd
}
;-----------------------------------------------------------------
;
; 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]
; ebx = pointer to device struct
; ecx = ICMP Packet size
; edx = ptr to ICMP Packet data
; esi = ipv4 source address
; edi = ipv4 dest address
; OUT: /
;
;-----------------------------------------------------------------
align 4
ICMP_input:
DEBUGF 1,"ICMP_input - start\n"
; First, check the checksum (altough some implementations ignore it)
push edx esi ecx
push [edx + ICMP_Packet.Checksum]
mov [edx + ICMP_Packet.Checksum], 0
mov esi, edx
xor edx, edx
call checksum_1
call checksum_2
pop si
cmp dx, si
pop ecx esi edx
jne .checksum_mismatch
cmp byte [edx + ICMP_Packet.Type], ICMP_ECHO ; Is this an echo request?
jne .check_sockets
; We well re-use the packet sow e can create the response as fast as possible
; Notice: this only works on pure ethernet (however, IP packet options are not a problem this time :)
DEBUGF 1,"ICMP_input - echo request\n"
mov byte [edx + ICMP_Packet.Type], ICMP_ECHOREPLY ; Change Packet type to reply
; Update stats (and validate device ptr)
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] ; Start of buffer
push dword [esi + ETH_FRAME.DstMAC]
push dword [esi + ETH_FRAME.SrcMAC]
pop dword [esi + ETH_FRAME.DstMAC]
pop dword [esi + ETH_FRAME.SrcMAC]
push word [esi + ETH_FRAME.DstMAC + 4]
push word [esi + ETH_FRAME.SrcMAC + 4]
pop word [esi + ETH_FRAME.DstMAC + 4]
pop word [esi + ETH_FRAME.SrcMAC + 4]
add esi, ETH_FRAME.Data
push [esi + IPv4_Packet.SourceAddress]
push [esi + IPv4_Packet.DestinationAddress]
pop [esi + IPv4_Packet.SourceAddress]
pop [esi + IPv4_Packet.DestinationAddress]
; Recalculate ip header checksum
movzx ecx, byte [esi + IPv4_Packet.VersionAndIHL] ; Calculate IP Header length by using IHL field
and ecx, 0x0f
shl cx, 2
mov edi, ecx ; IP header length
mov eax, edx ; ICMP packet start addr
push esi ; Calculate the IP checksum
xor edx, edx ;
call checksum_1 ;
call checksum_2 ;
pop esi ;
mov word [esi + IPv4_Packet.HeaderChecksum], dx ;
; Recalculate ICMP CheckSum
movzx ecx, word[esi + IPv4_Packet.TotalLength] ; Find length of IP Packet
xchg ch, cl ;
sub ecx, edi ; IP packet length - IP header length = ICMP packet length
mov esi, eax ; Calculate ICMP checksum
xor edx, edx ;
call checksum_1 ;
call checksum_2 ;
mov word [eax + ICMP_Packet.Checksum], dx ;
; Transmit the packet (notice that packet ptr and packet size have been on stack since start of the procedure!)
call [ebx + NET_DEVICE.transmit]
ret
.check_sockets:
; Look for an open ICMP socket
; esi = sender ip
mov ebx, net_sockets
.try_more:
; mov ax , [edx + ICMP_Packet.Identifier]
.next_socket:
mov ebx, [ebx + SOCKET.NextPtr]
or ebx, ebx
jz .dump
cmp [ebx + SOCKET.Domain], AF_INET4
jne .next_socket
cmp [ebx + SOCKET.Protocol], IP_PROTO_ICMP
jne .next_socket
cmp [ebx + IP_SOCKET.RemoteIP], esi
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+edi]
DEBUGF 1,"Found valid ICMP packet for socket %x\n", ebx
mov eax, ebx
add ebx, SOCKET.lock
call wait_mutex
mov esi, edx
jmp SOCKET_input
.checksum_mismatch:
DEBUGF 1,"ICMP_Handler - checksum mismatch\n"
.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
mov ebx, [eax + IP_SOCKET.LocalIP]
mov eax, [eax + IP_SOCKET.RemoteIP]
add ecx, ICMP_Packet.Data
mov di , IP_PROTO_ICMP SHL 8 + 128 ; TTL
shr edx, 16
call IPv4_output
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_output
;
; IN: eax = socket ptr
; ecx = data length
; esi = data offset
;
;-----------------------------------------------------------------
align 4
ICMP_output_raw:
DEBUGF 1,"Creating ICMP Packet for socket %x, data ptr=%x\n", eax, edx
push edx
mov di, IP_PROTO_ICMP SHL 8 + 128 ; TTL
shr edx, 16
mov ebx, [eax + IP_SOCKET.LocalIP]
mov eax, [eax + IP_SOCKET.RemoteIP]
call IPv4_output
jz .exit
pop esi
push edx
push eax
push edi ecx
DEBUGF 1,"copying %u bytes from %x to %x\n", ecx, esi, edi
rep movsb
pop ecx edi
mov [edi + ICMP_Packet.Checksum], 0
mov esi, edi
xor edx, edx
call checksum_1
call checksum_2
mov [edi + ICMP_Packet.Checksum], dx
DEBUGF 1,"Sending ICMP Packet\n"
call [ebx + NET_DEVICE.transmit]
ret
.exit:
DEBUGF 1,"Creating ICMP Packet failed\n"
add esp, 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
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