;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; UDP.INC ;;
;; ;;
;; Part of the tcp/ip network stack for KolibriOS ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 2366 $
struct UDP_header
SourcePort dw ?
DestinationPort dw ?
Length dw ? ; Length of (UDP Header + Data)
Checksum dw ?
ends
align 4
uglobal
UDP_PACKETS_TX rd MAX_IP
UDP_PACKETS_RX rd MAX_IP
endg
;-----------------------------------------------------------------
;
; UDP_init
;
; This function resets all UDP variables
;
;-----------------------------------------------------------------
macro UDP_init {
xor eax, eax
mov edi, UDP_PACKETS_TX
mov ecx, 2*MAX_IP
rep stosd
}
macro UDP_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx
; Pseudoheader
mov edx, IP_PROTO_UDP
add dl, [IP1+1]
adc dh, [IP1+0]
adc dl, [IP1+3]
adc dh, [IP1+2]
adc dl, [IP2+1]
adc dh, [IP2+0]
adc dl, [IP2+3]
adc dh, [IP2+2]
adc dl, cl ; byte[esi+UDP_header.Length+1]
adc dh, ch ; byte[esi+UDP_header.Length+0]
; Done with pseudoheader, now do real header
adc dl, byte[esi+UDP_header.SourcePort+1]
adc dh, byte[esi+UDP_header.SourcePort+0]
adc dl, byte[esi+UDP_header.DestinationPort+1]
adc dh, byte[esi+UDP_header.DestinationPort+0]
adc dl, byte[esi+UDP_header.Length+1]
adc dh, byte[esi+UDP_header.Length+0]
adc edx, 0
; Done with header, now do data
push esi
movzx ecx, [esi+UDP_header.Length]
rol cx , 8
sub cx , sizeof.UDP_header
add esi, sizeof.UDP_header
call checksum_1
call checksum_2
pop esi
add [esi+UDP_header.Checksum], dx ; this final instruction will set or clear ZF :)
}
;-----------------------------------------------------------------
;
; UDP_input:
;
; Called by IPv4_input,
; this procedure will inject the udp data diagrams in the application sockets.
;
; IN: [esp] = Pointer to buffer
; [esp+4] = size of buffer
; ebx = ptr to device struct
; ecx = UDP Packet size
; esi = ptr to UDP header
; edi = ptr to ipv4 source and dest address
;
; OUT: /
;
;-----------------------------------------------------------------
align 4
UDP_input:
DEBUGF 1,"UDP_input, size:%u\n", ecx
; First validate, checksum
neg [esi + UDP_header.Checksum] ; substract checksum from 0
jz .no_checksum ; if checksum is zero, it is considered valid and we continue processing
; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct
push esi
UDP_checksum (edi), (edi+4)
pop edx
jnz .checksum_mismatch
.no_checksum:
DEBUGF 1,"UDP Checksum is correct\n"
; Convert port numbers to intel format
rol [edx + UDP_header.DestinationPort], 8
rol [edx + UDP_header.SourcePort], 8
rol [edx + UDP_header.Length], 8
; Look for a socket where
; IP Packet UDP Destination Port = local Port
; IP Packet SA = Remote IP
mov si, [edx + UDP_header.DestinationPort]
mov cx, [edx + UDP_header.SourcePort]
mov edi, [edi + 4] ; ipv4 source address
mov eax, net_sockets
.next_socket:
mov eax, [eax + SOCKET.NextPtr]
or eax, eax
jz .dump
cmp [eax + SOCKET.Domain], AF_INET4
jne .next_socket
cmp [eax + SOCKET.Protocol], IP_PROTO_UDP
jne .next_socket
cmp [eax + UDP_SOCKET.LocalPort], si
jne .next_socket
DEBUGF 1,"using socket: %x\n", eax
;;; TODO: when packet is processed, check more sockets!
; cmp [eax + IP_SOCKET.RemoteIP], 0xffffffff
; je @f
; cmp [eax + IP_SOCKET.RemoteIP], edi
; jne .next_socket
; @@:
;
; FIXME: UDP should check remote IP, but not under all circumstances!
cmp [eax + UDP_SOCKET.firstpacket], 0
je .updateport
cmp [eax + UDP_SOCKET.RemotePort], cx
jne .dump
push ebx
lea ebx, [eax + SOCKET.lock]
call wait_mutex
pop ebx
.updatesock:
inc [UDP_PACKETS_RX]
DEBUGF 1,"Found valid UDP packet for socket %x\n", eax
lea esi, [edx + sizeof.UDP_header]
movzx ecx, [edx + UDP_header.Length]
sub ecx, sizeof.UDP_header
jmp SOCKET_input
.updateport:
push ebx
lea ebx, [eax + SOCKET.lock]
call wait_mutex
pop ebx
DEBUGF 1,"Changing remote port to: %u\n", cx
mov [eax + UDP_SOCKET.RemotePort], cx
inc [eax + UDP_SOCKET.firstpacket]
jmp .updatesock
.checksum_mismatch:
DEBUGF 2,"UDP_Handler - checksum mismatch\n"
.dump:
call kernel_free
add esp, 4 ; pop (balance stack)
DEBUGF 2,"UDP_Handler - dumping\n"
ret
;-----------------------------------------------------------------
;
; UDP_output
;
; IN: eax = socket pointer
; ecx = number of bytes to send
; esi = pointer to data
;
;-----------------------------------------------------------------
align 4
UDP_output:
DEBUGF 1,"UDP_output: socket:%x, bytes: %u, data ptr: %x\n", eax, ecx, esi
mov dx, [eax + UDP_SOCKET.RemotePort]
DEBUGF 1,"remote port: %u\n", dx
rol dx, 8
rol edx, 16
mov dx, [eax + UDP_SOCKET.LocalPort]
DEBUGF 1,"local port: %u\n", dx
rol dx, 8
mov ebx, [eax + IP_SOCKET.LocalIP]
mov eax, [eax + IP_SOCKET.RemoteIP]
mov di, IP_PROTO_UDP shl 8 + 128
sub esp, 8 ; Data ptr and data size will be placed here
add ecx, sizeof.UDP_header
;;; TODO: fragment id
push edx esi
call IPv4_output
jz .fail
mov [esp + 8], eax ; pointer to buffer start
mov [esp + 8 + 4], edx ; buffer size
mov [edi + UDP_header.Length], cx
rol [edi + UDP_header.Length], 8
pop esi
push edi ecx
sub ecx, sizeof.UDP_header
add edi, sizeof.UDP_header
shr ecx, 2
rep movsd
mov ecx, [esp]
and ecx, 3
rep movsb
pop ecx edi
pop dword [edi + UDP_header.SourcePort]
; Checksum
mov esi, edi
mov [edi + UDP_header.Checksum], 0
UDP_checksum (edi-4), (edi-8) ; TODO: fix this, IPv4 packet could have options..
inc [UDP_PACKETS_TX]
DEBUGF 1,"Sending UDP Packet to device %x\n", ebx
call [ebx + NET_DEVICE.transmit]
ret
.fail:
DEBUGF 1,"UDP_output: failed\n"
add esp, 4+4+8
xor eax, eax
ret
;---------------------------------------------------------------------------
;
; UDP_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
UDP_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:
mov eax, [UDP_PACKETS_TX + eax]
ret
.packets_rx:
mov eax, [UDP_PACKETS_RX + eax]
ret