mirror of
https://github.com/A2osX/A2osX.git
synced 2024-11-22 16:31:07 +00:00
286 lines
4.9 KiB
Plaintext
286 lines
4.9 KiB
Plaintext
PR#3
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PREFIX /A2OSX.SRC
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NEW
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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TCP.IN ldy #S.IP.SRC+3
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ldx #3
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.1 lda (ZPFrameBase1),y
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sta TmpSocket+S.SOCKET.DST.ADDR,x
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dey
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dex
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bpl .1
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ldy #S.TCP.SRCPORT
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lda (ZPFrameBase1),y
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sta TmpSocket+S.SOCKET.DST.PORT+1
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iny
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lda (ZPFrameBase1),y
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sta TmpSocket+S.SOCKET.DST.PORT
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ldy #S.IP.DST+3
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ldx #3
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.2 lda (ZPFrameBase1),y
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sta TmpSocket+S.SOCKET.SRC.ADDR,x
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dey
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dex
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bpl .2
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ldy #S.TCP.DSTPORT
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lda (ZPFrameBase1),y
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sta TmpSocket+S.SOCKET.SRC.PORT+1
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iny
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lda (ZPFrameBase1),y
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sta TmpSocket+S.SOCKET.SRC.PORT
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>LDYA L.SKT.TABLE
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>STYA ZPPtrSKT
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ldx #0
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.3 lda (ZPPtrSKT)
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beq .7
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cmp #S.SOCKET.SOCK.STREAM
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bne .7
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ldy #S.SOCKET.SRC.ADDR
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.4 lda TmpSocket,y
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cmp (ZPPtrSKT),y
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bne .7 Not for this socket...
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iny
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cpy #S.SOCKET.SRC.PORT+2
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bne .4
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ldy #S.SOCKET.SO
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lda (ZPPtrSKT),y
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and #S.SOCKET.SO.ACCEPTCONN Listening socket?
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beq .5
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ldy #S.TCP.OPTIONS yes, only accept SYN packet
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lda (ZPFrameBase1),y
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cmp #S.TCP.OPTIONS.SYN
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bne .7 not for this listening socket
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jmp TCP.IN.LISTEN.NEW
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.5 ldy #S.SOCKET.DST.ADDR
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.6 lda TmpSocket,y regular socket, check remote ADDR/PORT
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cmp (ZPPtrSKT),y
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bne .7
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iny
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cpy #S.SOCKET.DST.PORT+2
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bne .6
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jmp TCP.IN.ESTABLISHED
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.7 lda ZPPtrSKT
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clc
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adc #S.SOCKET
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sta ZPPtrSKT
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bcc .8
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inc ZPPtrSKT+1
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.8 inx
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cpx #K.SKTTABLE.SIZE
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bne .3
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clc Discard frame
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rts
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*--------------------------------------
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TCP.IN.LISTEN.NEW
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lda #S.SOCKET.SOCK.STREAM
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sta TmpSocket
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stz TmpSocket+S.SOCKET.SO
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ldy #S.TCP.SEQ.NUMBER+3
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ldx #3
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sec
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.1 lda (ZPFrameBase1),y
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adc #0
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sta TmpSocket+S.SOCKET.SQ.ACKNUM,x
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dey
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dex
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bpl .1
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ldx #3
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.2 lda A2osX.TIMER16,x
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sta TmpSocket+S.SOCKET.SQ.SEQNUM,x
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dex
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bpl .2
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>PUSHW L.TmpSocket
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jsr SKT.NEW
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bcs .9
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txa
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ldy #S.SOCKET.PARENT
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sta (ZPPtrSKT),y
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jsr SKT.TCPSendSYNACKA
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ldy #S.SOCKET.STATUS
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lda #S.SOCKET.STATUS.SYNRCVD
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sta (ZPPtrSKT),y
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clc
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.9 rts
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*--------------------------------------
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TCP.IN.ESTABLISHED
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stx hSocket
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ldy #S.SOCKET.STATUS
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lda (ZPPtrSKT),y
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cmp #S.SOCKET.STATUS.SYNRCVD Waiting for ACK to establish?
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bne .1
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ldy #S.TCP.OPTIONS yes, only accept ACK packet
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lda (ZPFrameBase1),y
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cmp #S.TCP.OPTIONS.ACK
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bne .8
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ldx #3
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ldy #S.SOCKET.SQ.SEQNUM+3
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sec
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.10 lda (ZPPtrSKT),y
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adc #0
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sta TmpDWord,x
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dey
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dex
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bpl .10
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ldx #3
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ldy #S.TCP.ACK.NUMBER+3
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.11 lda (ZPFrameBase1),y
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cmp TmpDWord,x
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bne .8
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dey
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dex
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bpl .11
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ldx #3
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ldy #S.SOCKET.SQ.SEQNUM+3
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.12 lda TmpDWord,x
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sta (ZPPtrSKT),y
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dey
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dex
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bpl .12
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ldy #S.SOCKET.STATUS
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lda #S.SOCKET.STATUS.ESTBLSH
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sta (ZPPtrSKT),y
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ldy #S.SOCKET.PARENT
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lda (ZPPtrSKT),y
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jsr SKT.GetA
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lda hSocket
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jsr SKT.AddToQueueL
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.8 clc
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rts
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.1 cmp #S.SOCKET.STATUS.ESTBLSH
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bne .99
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bra *
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.99 clc
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rts
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*--------------------------------------
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TCP.ComputeChecksum
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lda #0 RESET.TCP.CHECKSUM
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ldy #S.TCP.CHECKSUM
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sta (ZPFrameBase1),y
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iny
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sta (ZPFrameBase1),y
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>LDYA ZPFrameBase1
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>STYA ZPTmpPtr1
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lda ZPFrameLen1
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sec
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sbc #S.IP-2
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sta ZPDataLen
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lda ZPFrameLen1+1
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sbc /S.IP-2
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sta ZPDataLen+1
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clc
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* lda ZPDataLen+1
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* adc #0 RESERVED (all zero)
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sta IP.CHECKSUM
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lda ZPDataLen
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adc #S.IP.PROTOCOL.TCP
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sta IP.CHECKSUM+1
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ldy #S.IP.SRC
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ldx #4 4 words for SRC & DST IP
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.10 lda (ZPFrameBase1),y
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adc IP.CHECKSUM
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sta IP.CHECKSUM
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iny
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lda (ZPFrameBase1),y
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adc IP.CHECKSUM+1
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sta IP.CHECKSUM+1
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iny
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dex
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bne .10
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ldy #S.IP
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.1 jsr DecDataLen
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beq .8
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lda (ZPTmpPtr1),y
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adc IP.CHECKSUM
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sta IP.CHECKSUM
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iny
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bne .20
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inc ZPTmpPtr1+1
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.20 jsr DecDataLen
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bne .2
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lda #0
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bra .21
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.2 lda (ZPTmpPtr1),y
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.21 adc IP.CHECKSUM+1
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sta IP.CHECKSUM+1
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iny
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bne .1
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inc ZPTmpPtr1+1
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bra .1
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.8 ldy #S.TCP.CHECKSUM
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lda IP.CHECKSUM
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adc #0 Don't forget to add last carry!!!
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eor #$FF
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sta (ZPFrameBase1),y
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iny
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lda IP.CHECKSUM+1
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adc #0 Don't forget to add last carry!!!
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eor #$FF
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sta (ZPFrameBase1),y
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rts
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*--------------------------------------
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MAN
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SAVE LIB/LIBTCPIP.S.TCP
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LOAD LIB/LIBTCPIP.S
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ASM
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