1297 lines
32 KiB
PHP
1297 lines
32 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; TCP.INC ;;
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;; ;;
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;; TCP Processes for Menuet OS TCP/IP stack ;;
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;; ;;
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;; Version 0.6 4th July 2004 ;;
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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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;; v0.6 : Added reset handling in the established state ;;
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;; Added a timer per socket to allow delays when rx window ;;
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;; gets below 1KB ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; TCP TCB states
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TCB_LISTEN equ 1
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TCB_SYN_SENT equ 2
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TCB_SYN_RECEIVED equ 3
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TCB_ESTABLISHED equ 4
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TCB_FIN_WAIT_1 equ 5
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TCB_FIN_WAIT_2 equ 6
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TCB_CLOSE_WAIT equ 7
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TCB_CLOSING equ 8
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TCB_LAST_ACK equ 9
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TCB_TIME_WAIT equ 10
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TCB_CLOSED equ 11
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TWOMSL equ 10 ; # of secs to wait before closing socket
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TCP_RETRIES equ 5 ; Number of times to resend a packet
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TCP_TIMEOUT equ 10 ; resend if not replied to in x hs
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;*******************************************************************
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; Interface
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;
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; tcp_tx_handler Handles the TCP transmit queue
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; tcp_rx The protocol handler for received data
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; buildTCPPacket fills in the packet headers and data
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; tcpStateMachine Main state machine for received TCP packets
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; tcp_tcb_handler 1s timer, to erase tcb's in TIME_WAIT state
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;
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;*******************************************************************
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; TCP 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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;20 | Source Port | Destination Port |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;24 | Sequence Number |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;28 | Acknowledgment Number |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;32 | Data | |U|A|P|R|S|F| |
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; | Offset| Reserved |R|C|S|S|Y|I| Window |
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; | | |G|K|H|T|N|N| |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;36 | Checksum | Urgent Pointer |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;40 | Options | Padding |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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; | data
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struc TCP_PACKET
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{ .SourcePort dw ? ;+00
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.DestinationPort dw ? ;+02
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.SequenceNumber dd ? ;+04
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.AckNumber dd ? ;+08
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.DataOffset db ? ;+12 - DataOffset[0-3 bits] and Reserved[4-7]
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.Flags db ? ;+13 - Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN
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.Window dw ? ;+14
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.Checksum dw ? ;+16
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.UrgentPointer dw ? ;+18
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.Options rb 3 ;+20
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.Padding db ? ;+23
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.Data db ? ;+24
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}
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virtual at 0
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TCP_PACKET TCP_PACKET
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end virtual
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;***************************************************************************
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; Function
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; tcp_tcb_handler
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;
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; Description
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; Handles sockets in the timewait state, closing them
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; when the TCB timer expires
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;
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;***************************************************************************
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tcp_tcb_handler:
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; scan through all the sockets, decrementing active timers
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mov eax, SOCKETBUFFSIZE * NUM_SOCKETS
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mov ecx, NUM_SOCKETS
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tth1:
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sub eax, SOCKETBUFFSIZE
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cmp [eax + sockets + 32], dword 0
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jne tth2
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tth1a:
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cmp [eax + sockets + 72], dword 0
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jne tth4
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loop tth1
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ret
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tth2:
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; decrement it, delete socket if TCB timer = 0 & socket in timewait state
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pusha
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dec dword [eax + sockets + 32]
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cmp [eax + sockets + 32], dword 0
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jne tth3
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cmp [eax + sockets + 28], dword TCB_TIME_WAIT
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jne tth3
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; OK, delete socket
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mov edi, eax
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add edi, sockets
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xor eax, eax
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mov ecx, SOCKETHEADERSIZE
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cld
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rep stosb
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tth3:
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popa
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jmp tth1a
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loop tth1
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ret
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; TODO - prove it works!
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tth4:
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dec dword [eax + sockets + 72]
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loop tth1
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ret
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tth_exit:
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ret
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;***************************************************************************
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; Function
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; tcp_tx_handler
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;
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; Description
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; Handles queued TCP data
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; This is a kernel function, called by stack_handler
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;
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;***************************************************************************
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tcp_tx_handler:
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; decrement all resend buffers timers. If they
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; expire, queue them for sending, and restart the timer.
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; If the retries counter reach 0, delete the entry
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mov esi, resendQ
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mov ecx, 0
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tth001:
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cmp ecx, NUMRESENDENTRIES
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je tth003 ; None left
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cmp [esi], byte 0xFF
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jne tth002 ; found one
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inc ecx
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add esi, 4
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jmp tth001
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tth002:
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; we have one. decrement it's timer by 1
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dec word [esi+2]
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mov ax, [esi+2]
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cmp ax, 0
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je tth002a
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inc ecx
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add esi, 4
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jmp tth001 ; Timer not zero, so move on
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tth002a:
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mov bl, 0xff
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; restart timer, and decrement retries
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; After the first resend, back of on next, by a factor of 5
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mov [esi+2], word TCP_TIMEOUT * 5
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dec byte [esi+1]
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mov al, [esi+1]
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cmp al, 0
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jne tth004
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; retries now 0, so delete from queue
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xchg [esi], bl
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tth004:
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; resend packet
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pusha
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mov eax, EMPTY_QUEUE
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call dequeue
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cmp ax, NO_BUFFER
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jne tth004z
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; TODO - try again in 10ms.
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cmp bl, 0xff
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jne tth004za
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mov [esi], bl
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tth004za:
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; Mark it to expire in 10ms - 1 tick
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mov [esi+1], byte 1
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mov [esi+2], word 1
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jmp tth005
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tth004z:
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; we have a buffer # in ax
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push eax
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push ecx
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mov ecx, IPBUFFSIZE
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mul ecx
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add eax, IPbuffs
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; we have the buffer address in eax
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mov edi, eax
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pop ecx
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; get resend data address
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inc ecx
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; Now get buffer location, and copy buffer across. argh! more copying,,
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mov esi, resendBuffer - IPBUFFSIZE
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tth004a:
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add esi, IPBUFFSIZE
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loop tth004a
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; we have resend buffer location in esi
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mov ecx, IPBUFFSIZE
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; copy data across
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cld
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rep movsb
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; queue packet
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mov eax, NET1OUT_QUEUE
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mov edx, [stack_ip]
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mov ecx, [ edi + 16 ]
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cmp edx, ecx
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jne tth004b
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mov eax, IPIN_QUEUE
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tth004b:
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pop ebx
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call queue
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tth005:
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popa
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inc ecx
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add esi, 4
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jmp tth001
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tth003:
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ret
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;***************************************************************************
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; Function
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; tcp_rx
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;
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; Description
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; TCP 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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tcp_rx:
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; The process is as follows.
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; Look for a socket with matching remote IP, remote port, local port
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; if not found, then
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; look for remote IP + local port match ( where sockets remote port = 0)
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; if not found, then
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; look for a socket where local socket port == IP packets remote port
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; where sockets remote port, remote IP = 0
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; discard if not found
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; Call sockets tcbStateMachine, with pointer to packet.
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; the state machine will not delete the packet, so do that here.
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push eax
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; Look for a socket where
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; IP Packet TCP Destination Port = local Port
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; IP Packet SA = Remote IP
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; IP Packet TCP Source Port = remote Port
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mov eax, SOCKETBUFFSIZE * NUM_SOCKETS
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mov ecx, NUM_SOCKETS
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ss1:
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sub eax, SOCKETBUFFSIZE
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movzx ebx, word [edx + 22] ; get the dest. port from the TCP hdr
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cmp [eax + sockets + 12], bx ; compare with socket's local port
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jnz nxttst1 ; different - try next socket
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movzx ebx, word [edx + 20] ; get the source port from the TCP hdr
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cmp [eax + sockets + 20], bx ; compare with socket's remote port
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jnz nxttst1 ; different - try next socket
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mov ebx, [edx + 12] ; get the source IP Addr from the IP hdr
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cmp [eax + sockets + 16], ebx ; compare with socket's remote IP
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jnz nxttst1 ; different - try next socket
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; We have a complete match - use this socket
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jmp tcprx_001
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nxttst1:
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loop ss1 ; Return back if no match
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; If we got here, there was no match
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; Look for a socket where
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; IP Packet TCP Destination Port = local Port
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; IP Packet SA = Remote IP
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; socket remote Port = 0
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mov eax, SOCKETBUFFSIZE * NUM_SOCKETS
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mov ecx, NUM_SOCKETS
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ss2:
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sub eax, SOCKETBUFFSIZE
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movzx ebx, word [edx + 22] ; get the dest. port from the TCP hdr
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cmp [eax + sockets + 12], bx ; compare with socket's local port
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jnz nxttst2 ; different - try next socket
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mov ebx, [edx + 12] ; get the source IP Addr from the IP hdr
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cmp [eax + sockets + 16], ebx ; compare with socket's remote IP
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jnz nxttst2 ; different - try next socket
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mov ebx, 0
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cmp [eax + sockets + 20], bx ; only match a remote socket of 0
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jnz nxttst2 ; different - try next socket
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; We have a complete match - use this socket
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jmp tcprx_001
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nxttst2:
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loop ss2 ; Return back if no match
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; If we got here, there was no match
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; Look for a socket where
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; IP Packet TCP Destination Port = local Port
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; socket Remote IP = 0
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; socket remote Port = 0
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mov eax, SOCKETBUFFSIZE * NUM_SOCKETS
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mov ecx, NUM_SOCKETS
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ss3:
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sub eax, SOCKETBUFFSIZE
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movzx ebx, word [edx + 22] ; get destination port from the TCP hdr
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cmp [eax + sockets + 12], bx ; compare with socket's local port
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jnz nxttst3 ; different - try next socket
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mov ebx, 0
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cmp [eax + sockets + 20], bx ; only match a remote socket of 0
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jnz nxttst3 ; different - try next socket
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mov ebx, 0
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cmp [eax + sockets + 16], ebx ; only match a socket remote IP of 0
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jnz nxttst3 ; different - try next socket
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; We have a complete match - use this socket
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jmp tcprx_001
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nxttst3:
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loop ss3 ; Return back if no match
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; If we got here, we need to reject the packet
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inc dword [dumped_rx_count]
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jmp tcprx_exit
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tcprx_001:
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; We have a valid socket/TCB, so call the TCB State Machine for that skt.
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; socket is pointed to by [eax + sockets]
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; IP packet is pointed to by [edx]
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; IP buffer number is on stack ( it will be popped at the end)
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call tcpStateMachine
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tcprx_exit:
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pop eax
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call freeBuff
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ret
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;***************************************************************************
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; Function
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; buildTCPPacket
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;
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; Description
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; builds an IP Packet with TCP data fully populated for transmission
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; You may destroy any and all registers
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; TCP control flags specified in bl
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; This TCB is in [sktAddr]
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; User data pointed to by esi
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; Data length in ecx
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; Transmit buffer number in eax
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;
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;***************************************************************************
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buildTCPPacket:
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push ecx ; Save data length
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; convert buffer pointer eax to the absolute address
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mov ecx, IPBUFFSIZE
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mul ecx
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add eax, IPbuffs
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mov edx, eax
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mov [edx + 33], bl ; TCP flags
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mov ebx, [sktAddr]
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; So, ebx holds the socket ptr, edx holds the IPbuffer ptr
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; Fill in the IP header ( some data is in the socket descriptor)
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mov eax, [ebx + 8]
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mov [edx + 12], eax ; source IP
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mov eax, [ebx + 16]
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mov [edx + 16], eax ; Destination IP
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mov al, 0x45
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mov [edx], al ; Version, IHL
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xor al, al
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mov [edx + 1], al ; Type of service
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pop eax ; Get the TCP data length
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push eax
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add eax, 20 + 20 ; add IP header and TCP header lengths
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mov [edx + 2], ah
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mov [edx + 3], al
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xor al, al
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mov [edx + 4], al
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mov [edx + 5], al
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mov al, 0x40
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mov [edx + 6], al
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xor al, al
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mov [edx + 7], al
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mov al, 0x20
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mov [edx + 8], al
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mov al, 6 ; TCP protocol
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mov [edx + 9], al
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; Checksum left unfilled
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xor ax, ax
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mov [edx + 10], ax
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; Fill in the TCP header ( some data is in the socket descriptor)
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mov ax, [ebx + 12]
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mov [edx + 20], ax ; Local Port
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mov ax, [ebx + 20]
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mov [edx + 20 + 2], ax ; desitination Port
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; Checksum left unfilled
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xor ax, ax
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mov [edx + 20 + 16], ax
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; sequence number
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mov eax, [ebx + 48]
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mov [edx + 20 + 4], eax
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; ack number
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mov eax, [ebx + 56]
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mov [edx + 20 + 8], eax
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; window ( 0x2000 is default ).I could accept 4KB, fa0, ( skt buffer size)
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; 768 bytes seems better
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mov ax, 0x0003
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mov [edx + 20 + 14], ax
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; Urgent pointer (0)
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mov ax, 0
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mov [edx + 20 + 18], ax
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; data offset ( 0x50 )
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mov al, 0x50
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mov [edx + 20 + 12], al
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pop ecx ; count of bytes to send
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mov ebx, ecx ; need the length later
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cmp ebx, 0
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jz btp_001
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mov edi, edx
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add edi, 40
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cld
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rep movsb ; copy the data across
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|
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btp_001:
|
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; we have edx as IPbuffer ptr.
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; Fill in the TCP checksum
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; First, fill in pseudoheader
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mov eax, [edx + 12]
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mov [pseudoHeader], eax
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mov eax, [edx + 16]
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mov [pseudoHeader+4], eax
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mov ax, 0x0600 ; 0 + protocol
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mov [pseudoHeader+8], ax
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add ebx, 20
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mov eax, ebx
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mov [pseudoHeader+10], ah
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mov [pseudoHeader+11], al
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mov eax, pseudoHeader
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mov [checkAdd1], eax
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mov [checkSize1], word 12
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mov eax, edx
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add eax, 20
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mov [checkAdd2], eax
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mov eax, ebx
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mov [checkSize2], ax
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|
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call checksum
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|
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; store it in the TCP checksum ( in the correct order! )
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mov ax, [checkResult]
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|
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mov [edx + 20 + 16], ah
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mov [edx + 20 + 17], al
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|
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; Fill in the IP header checksum
|
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GET_IHL eax,edx ; get IP-Header length
|
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stdcall checksum_jb,edx,eax ; buf_ptr, buf_size
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|
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mov [edx + 10], ah
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mov [edx + 11], al
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|
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ret
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|
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|
|
; Increments the 32 bit value pointed to by esi in internet order
|
|
inc_inet_esi:
|
|
push eax
|
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add esi, 3
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mov al, byte[esi]
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inc al
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mov byte[esi], al
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cmp al, 0
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jnz iie_exit
|
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dec esi
|
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mov al, byte[esi]
|
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inc al
|
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mov byte[esi], al
|
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cmp al, 0
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jnz iie_exit
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|
dec esi
|
|
mov al, byte[esi]
|
|
inc al
|
|
mov byte[esi], al
|
|
cmp al, 0
|
|
jnz iie_exit
|
|
dec esi
|
|
mov al, byte[esi]
|
|
inc al
|
|
mov byte[esi], al
|
|
|
|
iie_exit:
|
|
pop eax
|
|
ret
|
|
|
|
|
|
; Increments the 32 bit value pointed to by esi in internet order
|
|
; by the value in ecx
|
|
add_inet_esi:
|
|
push eax
|
|
|
|
mov al, [esi]
|
|
shl eax, 8
|
|
inc esi
|
|
mov al, [esi]
|
|
shl eax, 8
|
|
inc esi
|
|
mov al, [esi]
|
|
shl eax, 8
|
|
inc esi
|
|
mov al, [esi]
|
|
add eax, ecx
|
|
mov [esi], al
|
|
dec esi
|
|
shr eax, 8
|
|
mov [esi], al
|
|
dec esi
|
|
shr eax, 8
|
|
mov [esi], al
|
|
dec esi
|
|
shr eax, 8
|
|
mov [esi], al
|
|
pop eax
|
|
ret
|
|
|
|
|
|
iglobal
|
|
TCBStateHandler:
|
|
dd stateTCB_LISTEN
|
|
dd stateTCB_SYN_SENT
|
|
dd stateTCB_SYN_RECEIVED
|
|
dd stateTCB_ESTABLISHED
|
|
dd stateTCB_FIN_WAIT_1
|
|
dd stateTCB_FIN_WAIT_2
|
|
dd stateTCB_CLOSE_WAIT
|
|
dd stateTCB_CLOSING
|
|
dd stateTCB_LAST_ACK
|
|
dd stateTCB_TIME_WAIT
|
|
dd stateTCB_CLOSED
|
|
endg
|
|
|
|
;***************************************************************************
|
|
; Function
|
|
; tcpStateMachine
|
|
;
|
|
; Description
|
|
; TCP state machine
|
|
; This is a kernel function, called by tcp_rx
|
|
;
|
|
; IP buffer address given in edx
|
|
; Socket/TCB address in [eax + sockets]
|
|
;
|
|
; The IP buffer will be released by the caller
|
|
;***************************************************************************
|
|
tcpStateMachine:
|
|
mov ebx, sockets
|
|
add ebx, eax
|
|
mov [sktAddr], ebx
|
|
|
|
; as a packet has been received, update the TCB timer
|
|
mov ecx, TWOMSL
|
|
mov [ebx + 32], ecx
|
|
|
|
; If the received packet has an ACK bit set,
|
|
; remove any packets in the resend queue that this
|
|
; received packet acknowledges
|
|
pusha
|
|
mov cl, [edx + 33]
|
|
and cl, 0x10
|
|
cmp cl, 0x10
|
|
jne tsm001 ; No ACK, so no data yet
|
|
|
|
|
|
; get skt number in al
|
|
shr eax, 12
|
|
|
|
; The ack number is in [edx + 28], inet format
|
|
; skt in al
|
|
|
|
mov esi, resendQ
|
|
mov ecx, 0
|
|
|
|
t001:
|
|
cmp ecx, NUMRESENDENTRIES
|
|
je t003 ; None left
|
|
cmp [esi], al
|
|
je t002 ; found one
|
|
inc ecx
|
|
add esi, 4
|
|
jmp t001
|
|
|
|
t002: ; Can we delete this buffer?
|
|
|
|
; If yes, goto t004. No, goto t001
|
|
; Get packet data address
|
|
|
|
push ecx
|
|
inc ecx
|
|
; Now get buffer location, and copy buffer across. argh! more copying,,
|
|
mov edi, resendBuffer - IPBUFFSIZE
|
|
t002a:
|
|
add edi, IPBUFFSIZE
|
|
loop t002a
|
|
|
|
; we have dest buffer location in edi. incoming packet in edx.
|
|
; Get this packets sequence number
|
|
; preserve al, ecx, esi, edx
|
|
|
|
mov cl, [edi + 24]
|
|
shl ecx, 8
|
|
mov cl, [edi + 25]
|
|
shl ecx, 8
|
|
mov cl, [edi + 26]
|
|
shl ecx, 8
|
|
mov cl, [edi + 27]
|
|
movzx ebx, byte [edi + 3]
|
|
mov bh, [edi + 2]
|
|
sub ebx, 40
|
|
add ecx, ebx ; ecx is now seq# of last byte +1, intel format
|
|
|
|
; get recievd ack #, in intel format
|
|
mov bl, [edx + 28]
|
|
shl ebx, 8
|
|
mov bl, [edx + 29]
|
|
shl ebx, 8
|
|
mov bl, [edx + 30]
|
|
shl ebx, 8
|
|
mov bl, [edx + 31]
|
|
|
|
cmp ebx, ecx ; Finally. ecx = rx'ed ack. ebx = last byte in que
|
|
; DANGER! need to handle case that we have just
|
|
; passed the 2**32, and wrapped round!
|
|
pop ecx
|
|
|
|
jae t004 ; if rx > old, delete old
|
|
inc ecx
|
|
add esi, 4
|
|
jmp t001
|
|
|
|
|
|
t004:
|
|
dec dword [arp_rx_count] ; ************ TEST ONLY!
|
|
|
|
mov [esi], byte 0xFF
|
|
inc ecx
|
|
add esi, 4
|
|
jmp t001
|
|
|
|
t003:
|
|
|
|
tsm001:
|
|
popa
|
|
|
|
; Call handler for given TCB state
|
|
mov ebx, [eax + sockets+28]
|
|
cmp ebx, TCB_LISTEN
|
|
jb tsm_exit
|
|
cmp ebx, TCB_CLOSED
|
|
ja tsm_exit
|
|
|
|
dec ebx
|
|
call dword [TCBStateHandler+ebx*4]
|
|
|
|
tsm_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_LISTEN:
|
|
; In this case, we are expecting a SYN packet
|
|
; For now, if the packet is a SYN, process it, and send a response
|
|
; If not, ignore it
|
|
|
|
; Look at control flags
|
|
mov bl, [edx + 33]
|
|
and bl, 0x02
|
|
cmp bl, 0x02
|
|
jnz stl_exit
|
|
|
|
; We have a SYN. update the socket with this IP packets details,
|
|
; And send a response
|
|
|
|
mov ebx, [edx + 12] ; IP source address
|
|
mov [eax + sockets + 16], ebx
|
|
mov bx, [edx + 20] ; IP source port
|
|
mov [eax + sockets + 20], bx
|
|
mov ebx, [edx + 24] ; IRS
|
|
mov [eax + sockets + 40], ebx
|
|
mov [eax + sockets + 56], ebx
|
|
mov esi, sockets
|
|
add esi, eax
|
|
add esi, 56
|
|
call inc_inet_esi ; RCV.NXT
|
|
mov ebx, [eax + sockets + 36] ; ISS
|
|
mov [eax + sockets + 48], ebx ; SND.NXT
|
|
|
|
; Now construct the response, and queue for sending by IP
|
|
mov eax, EMPTY_QUEUE
|
|
call dequeue
|
|
cmp ax, NO_BUFFER
|
|
je stl_exit
|
|
|
|
push eax
|
|
mov bl, 0x12 ; SYN + ACK
|
|
mov ecx, 0
|
|
mov esi, 0
|
|
|
|
call buildTCPPacket
|
|
|
|
mov eax, NET1OUT_QUEUE
|
|
mov edx, [stack_ip]
|
|
mov ecx, [ sktAddr ]
|
|
mov ecx, [ ecx + 16 ]
|
|
cmp edx, ecx
|
|
jne stl_notlocal
|
|
mov eax, IPIN_QUEUE
|
|
|
|
stl_notlocal:
|
|
; Send it.
|
|
pop ebx
|
|
call queue
|
|
|
|
|
|
mov ebx, TCB_SYN_RECEIVED
|
|
mov esi, [sktAddr]
|
|
mov [esi + 28], ebx
|
|
|
|
; increament SND.NXT in socket
|
|
add esi, 48
|
|
call inc_inet_esi
|
|
|
|
stl_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_SYN_SENT:
|
|
; We are awaiting an ACK to our SYN, with a SYM
|
|
; Look at control flags - expecting an ACK
|
|
mov bl, [edx + 33]
|
|
and bl, 0x12
|
|
cmp bl, 0x12
|
|
jnz stss_exit
|
|
|
|
mov ebx, TCB_ESTABLISHED
|
|
mov esi, [sktAddr]
|
|
mov [esi + 28], ebx
|
|
|
|
; Store the recv.nxt field
|
|
mov eax, [edx + 24]
|
|
|
|
; Update our recv.nxt field
|
|
mov esi, [sktAddr]
|
|
add esi, 56
|
|
mov [esi], eax
|
|
call inc_inet_esi
|
|
|
|
; Send an ACK
|
|
; Now construct the response, and queue for sending by IP
|
|
mov eax, EMPTY_QUEUE
|
|
call dequeue
|
|
cmp ax, NO_BUFFER
|
|
je stss_exit
|
|
|
|
push eax
|
|
|
|
mov bl, 0x10 ; ACK
|
|
mov ecx, 0
|
|
mov esi, 0
|
|
|
|
call buildTCPPacket
|
|
|
|
mov eax, NET1OUT_QUEUE
|
|
|
|
mov edx, [stack_ip]
|
|
mov ecx, [ sktAddr ]
|
|
mov ecx, [ ecx + 16 ]
|
|
cmp edx, ecx
|
|
jne stss_notlocal
|
|
mov eax, IPIN_QUEUE
|
|
|
|
stss_notlocal:
|
|
; Send it.
|
|
pop ebx
|
|
call queue
|
|
|
|
stss_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_SYN_RECEIVED:
|
|
; In this case, we are expecting an ACK packet
|
|
; For now, if the packet is an ACK, process it,
|
|
; If not, ignore it
|
|
|
|
; Look at control flags - expecting an ACK
|
|
mov bl, [edx + 33]
|
|
and bl, 0x10
|
|
cmp bl, 0x10
|
|
jnz stsr_exit
|
|
|
|
mov ebx, TCB_ESTABLISHED
|
|
mov esi, [sktAddr]
|
|
mov [esi + 28], ebx
|
|
|
|
stsr_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_ESTABLISHED:
|
|
; Here we are expecting data, or a request to close
|
|
; OR both...
|
|
|
|
; Did we receive a FIN or RST?
|
|
mov bl, [edx + 33]
|
|
and bl, 0x05
|
|
cmp bl, 0
|
|
je ste_chkack
|
|
|
|
; It was a fin or reset.
|
|
|
|
; Remove resend entries from the queue - I dont want to send any more data
|
|
pusha
|
|
|
|
mov ebx, [sktAddr]
|
|
sub ebx, sockets
|
|
shr ebx, 12 ; get skt #
|
|
|
|
mov esi, resendQ
|
|
mov ecx, 0
|
|
|
|
ste001:
|
|
cmp ecx, NUMRESENDENTRIES
|
|
je ste003 ; None left
|
|
cmp [esi], bl
|
|
je ste002 ; found one
|
|
inc ecx
|
|
add esi, 4
|
|
jmp ste001
|
|
|
|
ste002:
|
|
dec dword [arp_rx_count] ; ************ TEST ONLY!
|
|
|
|
mov [esi], byte 0xFF
|
|
jmp ste001
|
|
|
|
ste003:
|
|
popa
|
|
|
|
; was it a reset?
|
|
mov bl, [edx + 33]
|
|
and bl, 0x04
|
|
cmp bl, 0x04
|
|
jne ste003a
|
|
|
|
mov esi, [sktAddr]
|
|
mov ebx, TCB_CLOSED
|
|
mov [esi + 28], ebx
|
|
jmp ste_exit
|
|
|
|
ste003a:
|
|
; Send an ACK to that fin, and enter closewait state
|
|
|
|
mov esi, [sktAddr]
|
|
mov ebx, TCB_CLOSE_WAIT
|
|
mov [esi + 28], ebx
|
|
add esi, 56
|
|
mov eax, [esi] ; save original
|
|
call inc_inet_esi
|
|
;; jmp ste_ack - NO, there may be data
|
|
|
|
ste_chkack:
|
|
; Check that we received an ACK
|
|
mov bl, [edx + 33]
|
|
and bl, 0x10
|
|
cmp bl, 0x10
|
|
jnz ste_exit
|
|
|
|
|
|
; TODO - done, I think!
|
|
; First, look at the incoming window. If this is less than or equal to 1024,
|
|
; Set the socket window timer to 1. This will stop an additional packets being
|
|
; queued.
|
|
; ** I may need to tweak this value, since I do not know how many packets are already queued
|
|
mov ch, [edx + 34]
|
|
mov cl, [edx + 35]
|
|
cmp cx, 1024
|
|
ja ste004
|
|
|
|
mov ecx, [sktAddr]
|
|
mov [ecx+72], dword 1
|
|
|
|
ste004:
|
|
|
|
; OK, here is the deal
|
|
; My recv.nct field holds the seq of the expected next rec byte
|
|
; if the recevied sequence number is not equal to this, do not
|
|
; increment the recv.nxt field, do not copy data - just send a
|
|
; repeat ack.
|
|
|
|
; recv.nxt is in dword [edx+24], in inext format
|
|
; recv seq is in [sktAddr]+56, in inet format
|
|
; just do a comparision
|
|
mov ecx, [sktAddr]
|
|
add ecx, 56
|
|
|
|
cmp [ecx - 56 + 28], dword TCB_CLOSE_WAIT
|
|
mov ecx, [ecx]
|
|
jne stenofin
|
|
mov ecx, eax
|
|
|
|
stenofin:
|
|
cmp ecx, [edx+24]
|
|
jne ste_ack
|
|
|
|
|
|
; Read the data bytes, store in socket buffer
|
|
xor ecx, ecx
|
|
mov ch, [edx + 2]
|
|
mov cl, [edx + 3]
|
|
sub ecx, 40 ; Discard 40 bytes of header
|
|
|
|
cmp ecx, 0
|
|
jnz ste_data ; Read data, if any
|
|
|
|
; If we had received a fin, we need to ACK it.
|
|
mov esi, [sktAddr]
|
|
mov ebx, [esi + 28]
|
|
cmp ebx, TCB_CLOSE_WAIT
|
|
jz ste_ack
|
|
jnz ste_exit
|
|
|
|
ste_data:
|
|
push ecx
|
|
mov esi, [sktAddr]
|
|
|
|
add [esi + 24], ecx ; increment the count of bytes in buffer
|
|
|
|
mov eax, [esi + 4] ; get socket owner PID
|
|
push eax
|
|
|
|
mov eax, [esi + 24] ; get # of bytes already in buffer
|
|
|
|
; point to the location to store the data
|
|
add esi, eax
|
|
sub esi, ecx
|
|
add esi, SOCKETHEADERSIZE
|
|
|
|
add edx, 40 ; edx now points to the data
|
|
mov edi, esi
|
|
mov esi, edx
|
|
|
|
cld
|
|
rep movsb ; copy the data across
|
|
|
|
; flag an event to the application
|
|
pop eax
|
|
mov ecx,1
|
|
mov esi,TASK_DATA+TASKDATA.pid
|
|
|
|
news:
|
|
cmp [esi],eax
|
|
je foundPID1
|
|
inc ecx
|
|
add esi,0x20
|
|
cmp ecx,[TASK_COUNT]
|
|
jbe news
|
|
|
|
foundPID1:
|
|
shl ecx,8
|
|
or dword [ecx+SLOT_BASE+APPDATA.event_mask],dword 10000000b ; stack event
|
|
|
|
pop ecx
|
|
|
|
; Update our recv.nxt field
|
|
mov esi, [sktAddr]
|
|
add esi, 56
|
|
call add_inet_esi
|
|
|
|
ste_ack:
|
|
; Send an ACK
|
|
; Now construct the response, and queue for sending by IP
|
|
mov eax, EMPTY_QUEUE
|
|
call dequeue
|
|
cmp ax, NO_BUFFER
|
|
je ste_exit
|
|
|
|
push eax
|
|
|
|
mov bl, 0x10 ; ACK
|
|
mov ecx, 0
|
|
mov esi, 0
|
|
|
|
call buildTCPPacket
|
|
|
|
mov eax, NET1OUT_QUEUE
|
|
|
|
mov edx, [stack_ip]
|
|
mov ecx, [ sktAddr ]
|
|
mov ecx, [ ecx + 16 ]
|
|
cmp edx, ecx
|
|
jne ste_notlocal
|
|
mov eax, IPIN_QUEUE
|
|
ste_notlocal:
|
|
|
|
; Send it.
|
|
pop ebx
|
|
call queue
|
|
|
|
ste_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_FIN_WAIT_1:
|
|
; We can either receive an ACK of a fin, or a fin
|
|
mov bl, [edx + 33]
|
|
and bl, 0x10
|
|
cmp bl, 0x10
|
|
jnz stfw1_001
|
|
|
|
; It was an ACK
|
|
mov esi, [sktAddr]
|
|
mov ebx, TCB_FIN_WAIT_2
|
|
mov [esi + 28], ebx
|
|
jmp stfw1_exit
|
|
|
|
stfw1_001:
|
|
; It must be a fin then
|
|
mov esi, [sktAddr]
|
|
mov ebx, TCB_CLOSING
|
|
mov [esi + 28], ebx
|
|
add esi, 56
|
|
call inc_inet_esi
|
|
|
|
; Send an ACK
|
|
mov eax, EMPTY_QUEUE
|
|
call dequeue
|
|
cmp ax, NO_BUFFER
|
|
je stfw1_exit
|
|
|
|
push eax
|
|
|
|
mov bl, 0x10 ; ACK
|
|
mov ecx, 0
|
|
mov esi, 0
|
|
|
|
call buildTCPPacket
|
|
mov eax, NET1OUT_QUEUE
|
|
|
|
mov edx, [stack_ip]
|
|
mov ecx, [ sktAddr ]
|
|
mov ecx, [ ecx + 16 ]
|
|
cmp edx, ecx
|
|
jne stfw1_notlocal
|
|
mov eax, IPIN_QUEUE
|
|
|
|
stfw1_notlocal:
|
|
; Send it.
|
|
pop ebx
|
|
call queue
|
|
|
|
stfw1_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_FIN_WAIT_2:
|
|
mov esi, [sktAddr]
|
|
|
|
; Get data length
|
|
xor ecx, ecx
|
|
mov ch, [edx+2]
|
|
mov cl, [edx+3]
|
|
sub ecx, 40
|
|
|
|
mov bl, [edx + 33]
|
|
and bl, 0x01
|
|
cmp bl, 0x01
|
|
jne stfw2001
|
|
|
|
; Change state, as we have a fin
|
|
mov ebx, TCB_TIME_WAIT
|
|
mov [esi + 28], ebx
|
|
|
|
inc ecx ; FIN is part of the sequence space
|
|
|
|
stfw2001:
|
|
add esi, 56
|
|
call add_inet_esi
|
|
|
|
; Send an ACK
|
|
mov eax, EMPTY_QUEUE
|
|
call dequeue
|
|
cmp ax, NO_BUFFER
|
|
je stfw2_exit
|
|
|
|
push eax
|
|
|
|
mov bl, 0x10 ; ACK
|
|
mov ecx, 0
|
|
mov esi, 0
|
|
|
|
call buildTCPPacket
|
|
|
|
mov eax, NET1OUT_QUEUE
|
|
|
|
mov edx, [stack_ip]
|
|
mov ecx, [ sktAddr ]
|
|
mov ecx, [ ecx + 16 ]
|
|
cmp edx, ecx
|
|
jne stfw2_notlocal
|
|
mov eax, IPIN_QUEUE
|
|
|
|
stfw2_notlocal:
|
|
; Send it.
|
|
pop ebx
|
|
call queue
|
|
|
|
; Only delete the socket if we received the FIN
|
|
|
|
mov bl, [edx + 33]
|
|
and bl, 0x01
|
|
cmp bl, 0x01
|
|
jne stfw2_exit
|
|
|
|
; mov edi, [sktAddr]
|
|
|
|
; delete the socket. Should really wait for 2MSL
|
|
; xor eax, eax
|
|
; mov ecx,SOCKETHEADERSIZE
|
|
; cld
|
|
; rep stosb
|
|
|
|
stfw2_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_CLOSE_WAIT:
|
|
; Intentionally left empty
|
|
; socket_close_tcp handles this
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_CLOSING:
|
|
; We can either receive an ACK of a fin, or a fin
|
|
mov bl, [edx + 33]
|
|
and bl, 0x10
|
|
cmp bl, 0x10
|
|
jnz stc_exit
|
|
|
|
; It was an ACK
|
|
|
|
mov edi, [sktAddr]
|
|
|
|
; delete the socket
|
|
xor eax, eax
|
|
mov ecx,SOCKETHEADERSIZE
|
|
cld
|
|
rep stosb
|
|
|
|
stc_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_LAST_ACK:
|
|
; Look at control flags - expecting an ACK
|
|
mov bl, [edx + 33]
|
|
and bl, 0x10
|
|
cmp bl, 0x10
|
|
jnz stla_exit
|
|
|
|
mov edi, [sktAddr]
|
|
|
|
; delete the socket
|
|
xor eax, eax
|
|
mov ecx,SOCKETHEADERSIZE
|
|
cld
|
|
rep stosb
|
|
|
|
stla_exit:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_TIME_WAIT:
|
|
ret
|
|
|
|
|
|
|
|
stateTCB_CLOSED:
|
|
ret
|