mirror of
https://github.com/A2osX/A2osX.git
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264 lines
4.5 KiB
Plaintext
264 lines
4.5 KiB
Plaintext
NEW
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AUTO 3,1
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.LIST OFF
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*--------------------------------------
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IP.IN ldy #S.IP.PROTOCOL
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lda (ZPFrameInPtr),y
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cmp #S.IP.PROTOCOL.ICMP
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bne .2
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jmp ICMP.IN
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.2 cmp #S.IP.PROTOCOL.UDP
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bne .3
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jsr FRM.GetTargetSKT.TCPUDP
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jsr SKT.FindMatchingLocRem
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bcs .9
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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
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.3 cmp #S.IP.PROTOCOL.TCP
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bne .9
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jsr TCP.IN TCP may NOT discard FrameIn
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.9 lda hFrameIn
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beq .8
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>SYSCALL2 FreeMem
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.8 clc
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rts
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*--------------------------------------
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IP.ComputeICMPChecksum
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stz IP.CHECKSUM
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stz IP.CHECKSUM+1
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lda ZPFrameOutLen
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sec
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sbc #S.IP
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eor #$ff
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tax
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lda ZPFrameOutLen+1
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sbc /S.IP
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eor #$ff
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ldy #S.ICMP.CHECKSUM
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clc
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jmp IP.ComputeChecksum
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*--------------------------------------
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IP.ComputeUDPChecksum
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clc
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ldy #S.UDP.LENGTH+1
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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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dey
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lda (ZPFrameOutPtr),y
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adc /S.IP.PROTOCOL.UDP (all zero)
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sta IP.CHECKSUM
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jsr IP.AddSrcDstIPToChecksum
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ldy #S.UDP.LENGTH+1
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lda (ZPFrameOutPtr),y
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eor #$ff
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tax
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dey
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lda (ZPFrameOutPtr),y
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eor #$ff
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ldy #S.UDP.CHECKSUM
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bra IP.ComputeChecksum
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*--------------------------------------
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IP.ComputeTCPChecksum
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lda ZPFrameOutLen
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sec
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sbc #S.IP
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sta IP.CHECKSUM.TMP
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lda ZPFrameOutLen+1
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sbc /S.IP
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sta IP.CHECKSUM.TMP+1
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clc
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* lda IP.CHECKSUM.TMP+1
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* adc /S.IP.PROTOCOL.TCP (all zero)
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sta IP.CHECKSUM
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lda IP.CHECKSUM.TMP
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adc #S.IP.PROTOCOL.TCP
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sta IP.CHECKSUM+1
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jsr IP.AddSrcDstIPToChecksum
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lda IP.CHECKSUM.TMP
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eor #$ff
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tax
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lda IP.CHECKSUM.TMP+1
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eor #$ff
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ldy #S.TCP.CHECKSUM
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*--------------------------------------
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* X,A = !ByteCount, Y = Offset in Frame
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*--------------------------------------
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IP.ComputeChecksum
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phy Save Offset
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pha Save !ByteCount.HI
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lda #0 Reset 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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ldy #S.IP
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.1 inx
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bne .11
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pla
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inc
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beq .8
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pha
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.11 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 inx
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bne .2
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pla
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inc
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beq .7
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pha
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.2 lda (ZPTmpPtr1),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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bne .1
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inc ZPTmpPtr1+1
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bra .1
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.7 adc IP.CHECKSUM+1 A=0 from beq .7
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sta IP.CHECKSUM+1
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.8 ply
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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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IP.AddSrcDstIPToChecksum
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ldy #S.IP.SRC
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ldx #4 4 words for SRC & DST IP
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.1 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 .1
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rts
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*--------------------------------------
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IP.SetDestMAC ldy #S.IP.DST
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lda (ZPFrameOutPtr),y
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iny
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.1 and (ZPFrameOutPtr),y
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iny
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cpy #S.IP.DST+4
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bne .1
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cmp #$FF
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bne .3 not a broadcast....
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ldy #S.ETH.DSTMAC
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.2 sta (ZPFrameOutPtr),y
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iny
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cpy #S.ETH.DSTMAC+6
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bne .2
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clc
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rts
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.3 ldy #S.IP.DST+3
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ldx #3
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.4 lda (ZPFrameOutPtr),y
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eor IPCFG+S.IPCFG.IP,x
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and IPCFG+S.IPCFG.MASK,x
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bne .6
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dey
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dex
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bpl .4
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ldy #S.IP.DST+3 Same network, query ARP for dest IP
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ldx #3
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.5 lda (ZPFrameOutPtr),y
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sta ARP.TmpCache+S.ARPCACHE.IP,x
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dey
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dex
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bpl .5
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bra .8
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.6 ldx #3 Not Same network, query ARP for GW
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.7 lda IPCFG+S.IPCFG.GW,x
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sta ARP.TmpCache+S.ARPCACHE.IP,x
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dex
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bpl .7
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.8 jsr ARP.QUERY.I
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bcs .99
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ldx #5
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ldy #S.ETH.DSTMAC+5
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.11 lda ARP.TmpCache+S.ARPCACHE.MAC,x
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sta (ZPFrameOutPtr),y
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dey
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dex
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bpl .11
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clc
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.99 rts
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*--------------------------------------
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MAN
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SAVE USR/SRC/LIB/LIBTCPIP.S.IP
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LOAD USR/SRC/LIB/LIBTCPIP.S
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ASM
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