mirror of
https://github.com/A2osX/A2osX.git
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170 lines
3.1 KiB
Plaintext
170 lines
3.1 KiB
Plaintext
PR#3
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PREFIX /A2OSX.SRC
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LOMEM $A00
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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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UDP.IN jsr IP.FillSKT.TemplateSrcDst
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ldy #S.UDP.SRCPORT
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lda (ZPFrameInPtr),y
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sta SKT.Template+S.SOCKET.DST.PORT+1
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iny
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lda (ZPFrameInPtr),y
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sta SKT.Template+S.SOCKET.DST.PORT
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ldy #S.UDP.DSTPORT
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lda (ZPFrameInPtr),y
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sta SKT.Template+S.SOCKET.SRC.PORT+1
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iny
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lda (ZPFrameInPtr),y
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sta SKT.Template+S.SOCKET.SRC.PORT
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lda hSocketTable
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>SYSCALL GetMemPtrA
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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.DGRAM
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bne .7
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ldy #S.SOCKET.SRC.ADDR
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lda (ZPPtrSKT),y SOCKET.SRC.ADDR=0.0.0.0 ?
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bne .41
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ldy #S.SOCKET.SRC.PORT yes, do not check if IP match
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.4 lda (ZPPtrSKT),y
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.41 cmp SKT.Template,y
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bne .7
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iny
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cpy #S.SOCKET.DST.ADDR
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bne .4
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lda (ZPPtrSKT),y SOCKET.DST.ADDR=FF.FF.FF.FF ?
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cmp #$FF
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bne .51
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ldy #S.SOCKET.DST.PORT yes, do not check if IP match
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.5 lda (ZPPtrSKT),y
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.51 cmp SKT.Template,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 .5
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lda hFrameIn
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jsr SKT.AddToQueueA
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bcs .9 Q full, discard...
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rts DO NOT Discard this queued frame
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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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.9 lda hFrameIn
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>SYSCALL FreeMemA
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rts
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*--------------------------------------
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UDP.ComputeChecksum
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lda #0 RESET.TCP.CHECKSUM
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ldy #S.UDP.CHECKSUM
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sta (ZPFrameOutPtr),y
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iny
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sta (ZPFrameOutPtr),y
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>LDYA ZPFrameOutPtr
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>STYA ZPTmpPtr1
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lda ZPFrameOutLen
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sec
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sbc #S.IP-2
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sta ZPDataInLen
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lda ZPFrameOutLen+1
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sbc /S.IP-2
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sta ZPDataInLen+1
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clc
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ldy #S.UDP.LENGTH
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lda (ZPFrameOutPtr),y
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* adc #0 RESERVED (all zero)
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sta IP.CHECKSUM
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iny
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lda (ZPFrameOutPtr),y
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adc #S.IP.PROTOCOL.UDP
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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 (ZPFrameOutPtr),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 (ZPFrameOutPtr),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 DecDataInLen
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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 DecDataInLen
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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.UDP.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 #$FF
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sta (ZPFrameOutPtr),y
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iny
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lda IP.CHECKSUM+1
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adc #0 Don't forget to add last carry!!!
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eor #$FF
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sta (ZPFrameOutPtr),y
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rts
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*--------------------------------------
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MAN
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SAVE LIB/LIBTCPIP.S.UDP
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LOAD LIB/LIBTCPIP.S
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ASM
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