forked from KolibriOS/kolibrios
165 lines
5.6 KiB
PHP
165 lines
5.6 KiB
PHP
$Revision$
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; UDP.INC ;;
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;; ;;
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;; UDP Processes for Menuet OS TCP/IP stack ;;
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;; ;;
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;; Version 0.3 29 August 2002 ;;
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;; ;;
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;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;;
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;; ;;
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;; See file COPYING for details ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;*******************************************************************
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; Interface
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;
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; udp_rx Handles received IP packets with the UDP protocol
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;
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;*******************************************************************
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;
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; UDP Payload ( Data field in IP datagram )
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;
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; 0 1 2 3
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; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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;
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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; | Source Port | Destination Port |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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; | Length ( UDP Header + Data ) | Checksum |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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; | UDP Data |
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; +-+-+-.......... -+
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;
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struc UDP_PACKET
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{ .SourcePort dw ? ;+00
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.DestinationPort dw ? ;+02
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.Length dw ? ;+04 - Length of (UDP Header + Data)
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.Checksum dw ? ;+06
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.Data db ? ;+08
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}
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virtual at 0
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UDP_PACKET UDP_PACKET
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end virtual
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;***************************************************************************
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; Function
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; udp_rx [by Johnny_B]
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;
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; Description
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; UDP protocol handler
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; This is a kernel function, called by ip_rx
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; IP buffer address given in edx
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; IP buffer number in eax
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; Free up (or re-use) IP buffer when finished
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;
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;***************************************************************************
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udp_rx:
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push eax
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; First validate the header & checksum. Discard buffer if error
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; Look for a socket where
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; IP Packet UDP Destination Port = local Port
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; IP Packet SA = Remote IP
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movzx ebx, word [edx + 22] ; get the local port from
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; the IP packet's UDP header
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mov eax, SOCKETBUFFSIZE * NUM_SOCKETS
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mov ecx, NUM_SOCKETS
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fs1:
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sub eax, SOCKETBUFFSIZE
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cmp [eax + sockets + 12], bx ; bx will hold the 'wrong' value,
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; but the comparision is correct
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loopnz fs1 ; Return back if no match
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jz fs_done
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; No match, so exit
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jmp udprx_001
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fs_done:
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; For dhcp, we must allow any remote server to respond.
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; I will accept the first incoming response to be the one
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; I bind to, if the socket is opened with a destination IP address of
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; 255.255.255.255
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mov ebx, [eax + sockets + 16]
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cmp ebx, 0xffffffff
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je udprx_002
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mov ebx, [edx + 12] ; get the Source address from the IP packet
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cmp [eax + sockets + 16], ebx
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jne udprx_001 ; Quit if the source IP is not valid
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udprx_002:
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; OK - we have a valid UDP packet for this socket.
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; First, update the sockets remote port number with the incoming msg
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; - it will have changed
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; from the original ( 69 normally ) to allow further connects
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movzx ebx, word [edx + 20] ; get the UDP source port
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; ( was 69, now new )
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mov [eax + sockets + 20], bx
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; Now, copy data to socket. We have socket address as [eax + sockets].
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; We have IP packet in edx
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; get # of bytes in ecx
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movzx ecx, byte [edx + 3] ; total length of IP packet. Subtract
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mov ch, byte [edx + 2] ; 20 + 8 gives data length
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sub ecx, 28
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mov ebx, eax
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add ebx, sockets ; ebx = address of actual socket
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mov eax, [ebx+ 4] ; get socket owner PID
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push eax
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mov eax, [ebx + 24] ; get # of bytes already in buffer
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add [ebx + 24], ecx ; increment the count of bytes in buffer
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; point to the location to store the data
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add ebx, eax
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add ebx, SOCKETHEADERSIZE
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; ebx = location for first byte, ecx has count,
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; edx points to data
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add edx, 28 ; edx now points to the data
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mov edi, ebx
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mov esi, edx
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cld
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rep movsb ; copy the data across
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; flag an event to the application
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pop eax
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mov ecx,1
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mov esi,TASK_DATA+TASKDATA.pid
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newsearch:
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cmp [esi],eax
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je foundPID
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inc ecx
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add esi,0x20
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cmp ecx,[TASK_COUNT]
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jbe newsearch
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foundPID:
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shl ecx,8
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or dword [ecx+SLOT_BASE+APPDATA.event_mask],dword 10000000b ; stack event
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mov [check_idle_semaphore],200
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udprx_001:
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pop eax
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call freeBuff ; Discard the packet
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ret
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