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A2osX/LIB/LIBTCPIP.S.TCP.txt
burniouf 84d77aaf7f TCPIP:fixes for dual FIN/ACK transaction 
DAN2ETH.DRV
2023-01-06 15:02:35 +01:00

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NEW
AUTO 3,1
*--------------------------------------
TCP.IN jsr FRM.GetTargetSKT.TCPUDP
jsr SKT.FindMatchingLocRem
bcs TCP.IN.JMP.DISCARD no socket, go discard
ldy #S.TCP.OPTIONS
lda (ZPFrameInPtr),y
and #S.TCP.OPTIONS.RST RST ? go Kill this socket...
bne TCP.IN.RST ...and discard frame
ldy #S.SOCKET.TCP.S
lda (ZPPtrSKT),y
asl
tax
jmp (J.TCP.IN,x)
*--------------------------------------
TCP.IN.RST lda #S.SOCKET.TCP.S.TIMEWT
ldy #S.SOCKET.TCP.S
sta (ZPPtrSKT),y
*--------------------------------------
TCP.IN.JMP.CLOSED
TCP.IN.JMP.OPENED
TCP.IN.JMP.DISCARD
clc
rts
*--------------------------------------
TCP.IN.JMP.LISTEN
ldy #S.SOCKET.T Create a new client socket
lda (ZPPtrSKT),y
tax Same type a listening socket
iny #S.SOCKET.PROTO
lda (ZPPtrSKT),y
jsr SKT.Socket.I get new socket in ZPTmpPtr1
bcs TCP.IN.JMP.DISCARD
jsr SKT.AddToQueueA Queued successfully ?
bcs TCP.IN.JMP.DISCARD no, discard frame and new socket
jsr ARP.AddFromFrameInPtr
lda ZPTmpPtr1
sta ZPPtrSKT
lda ZPTmpPtr1+1
sta ZPPtrSKT+1
jsr SKT.SetLocAddr
jsr SKT.SetRemAddr
jsr SKT.NewTCB
bcs .9
jsr TCP.IN.ACKTheSYN
lda #S.SOCKET.TCP.S.OPENED
jsr SKT.StoreTCB.S
lda #S.TCP.OPTIONS.SYN+S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOptA SYN received, Send SYN.ACK
bcs .9
lda #S.SOCKET.TCP.S.SYNRCVD
jmp SKT.StoreTCB.S
.9 rts
*--------------------------------------
TCP.IN.JMP.SYNSENT
ldy #S.TCP.OPTIONS SYN Send, only accept SYN.ACK packet, then Send ACK
lda (ZPFrameInPtr),y
and #S.TCP.OPTIONS.SYN+S.TCP.OPTIONS.ACK
cmp #S.TCP.OPTIONS.SYN+S.TCP.OPTIONS.ACK
bne .9
jsr SKT.GetTCB
ldx #3
ldy #S.TCP.ACKNUM+3
sec Check if ACK=OUTNEXTSEQ+1
.1 lda SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ,x
adc #0
sta SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ,x
eor (ZPFrameInPtr),y
bne .9
dey
dex
bpl .1
jsr TCP.IN.ACKTheSYN
jsr TCP.OUT.SendACK SYN.ACK received, Send, ACK
bcs .9
lda #S.SOCKET.TCP.S.ESTBLSH
jmp SKT.StoreTCB.S
.9 lda #S.TCP.OPTIONS.RST
jsr TCP.OUT.SendOptA Send RST
jmp TCP.IN.RST
*--------------------------------------
TCP.IN.JMP.SYNRCVD
ldy #S.TCP.OPTIONS SYN Received, SYN.ACK Sent, only accept ACK packet
lda (ZPFrameInPtr),y
cmp #S.TCP.OPTIONS.ACK
bne .8
jsr SKT.GetTCB
ldx #3
ldy #S.TCP.ACKNUM+3
sec
.1 lda SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ,x Check if ACK=OUTNEXTSEQ+1
adc #0
sta SKT.Cache+S.SOCKET.TCP.OUTSENTSEQ,x setup SEQNUM
sta SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ,x ...and update NEXTSEQ
eor (ZPFrameInPtr),y
bne .8
dey
dex
bpl .1
lda #S.SOCKET.TCP.S.ESTBLSH
jmp SKT.StoreTCB.S
.8 clc
.9 rts
*--------------------------------------
TCP.IN.JMP.ESTBLSH
jsr SKT.GetTCB
ldy #S.TCP.OPTIONS
lda (ZPFrameInPtr),y
and #S.TCP.OPTIONS.ACK Remote side ACKed data ?
beq .4
* Ack sent data
ldy #S.TCP.ACKNUM+3 Get new ACK number from FrameIn...
ldx #3 Substract old ACK from socket
sec
.1 lda (ZPFrameInPtr),y
pha
sbc SKT.Cache+S.SOCKET.TCP.OUTSENTSEQ,x
sta TmpDWord,x
pla ....and Set SEQ = new SEQ
sta SKT.Cache+S.SOCKET.TCP.OUTSENTSEQ,x
dey
dex
bpl .1
bcc .70 ACK > SENT SEQ ????
lda TmpDWord+3
ldx TmpDWord+2
bne .2
tay
beq .4
.2 pha
clc
adc SKT.Cache+S.SOCKET.TCP.OUTTAIL
sta SKT.Cache+S.SOCKET.TCP.OUTTAIL
txa
adc SKT.Cache+S.SOCKET.TCP.OUTTAIL+1
and /K.TCP.WSIZE-1
sta SKT.Cache+S.SOCKET.TCP.OUTTAIL+1
pla
clc
adc SKT.Cache+S.SOCKET.TCP.OUTFREE
sta SKT.Cache+S.SOCKET.TCP.OUTFREE
txa
adc SKT.Cache+S.SOCKET.TCP.OUTFREE+1
sta SKT.Cache+S.SOCKET.TCP.OUTFREE+1
lda SKT.Cache+S.SOCKET.TCP.OUTUSED
sec
sbc TmpDWord+3
sta SKT.Cache+S.SOCKET.TCP.OUTUSED
lda SKT.Cache+S.SOCKET.TCP.OUTUSED+1
sbc TmpDWord+2
sta SKT.Cache+S.SOCKET.TCP.OUTUSED+1
jsr SKT.StoreTCB
* Store incoming data
.4 jsr TCP.IN.SetDataInPtrAndLen
lda ZPDataInLen Incoming Data in this frame ?
ora ZPDataInLen+1
beq .7 No data, ...
ldy #S.TCP.SEQNUM+3
ldx #3
.5 lda (ZPFrameInPtr),y
eor SKT.Cache+S.SOCKET.TCP.INSEQNUM,x
bne .90 Missed a frame.....
dey
dex
bpl .5
ldy #S.SOCKET.T
lda (ZPPtrSKT),y
cmp #S.SOCKET.T.STREAM
bne .52
jsr SKT.AddDataToSktIn yes, queue data if there is room for....
bcc .6
rts
.52 lda hFrameIn
jsr SKT.AddToQueueA
bcs .99
stz hFrameIn DON'T DISCARD
.6 lda ZPDataInLen
ldy ZPDataInLen+1
ldx #S.SOCKET.TCP.INSEQNUM
jsr TCP.AddAYToSktCacheAtX
jsr SKT.StoreTCB update socket
* bra .7
.70 jsr TCP.SetSocketTCPO.ACK ...and ack data
.7 ldy #S.TCP.OPTIONS
lda (ZPFrameInPtr),y
and #S.TCP.OPTIONS.FIN
beq .8
jsr SKT.StoreTCB update socket
lda #S.TCP.OPTIONS.FIN+S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOptA FIN received, Send FIN.ACK
lda #S.SOCKET.TCP.S.LASTACK
jmp SKT.StoreTCB.S
.8 ldy #S.SOCKET.TCP.O
lda (ZPPtrSKT),y
bne .91
.80 clc
.99 rts
.90
* lda #S.TCP.OPTIONS.ACK Send 3 ACK for last SEQ number
* jsr TCP.OUT.SendOptA
* lda #S.TCP.OPTIONS.ACK
* jsr TCP.OUT.SendOptA
lda #S.TCP.OPTIONS.ACK
.91 jmp TCP.OUT.SendOptA
*--------------------------------------
TCP.IN.JMP.LASTACK
ldy #S.TCP.OPTIONS only accept ACK packet
lda (ZPFrameInPtr),y
bit #S.TCP.OPTIONS.ACK
beq .8
* jsr TCP.OUT.SendACK
ldy #S.SOCKET.TCP.S
lda #S.SOCKET.TCP.S.TIMEWT
sta (ZPPtrSKT),y
.8
*--------------------------------------
TCP.IN.JMP.CLWAIT
clc Wait for SKT.shutdown
rts
*--------------------------------------
TCP.IN.JMP.FINWT1
ldy #S.TCP.OPTIONS FIN sent, accept ACK or FIN/ACK packet
lda (ZPFrameInPtr),y
bit #S.TCP.OPTIONS.FIN
bne TCP.IN.2TIMEWT FIN/ACK
jsr SKT.GetTCB
lda #S.SOCKET.TCP.S.FINWT2
jmp SKT.StoreTCB.S
*--------------------------------------
TCP.IN.JMP.FINWT2
ldy #S.TCP.OPTIONS FIN sent & ACKed, awaiting FIN
lda (ZPFrameInPtr),y
bit #S.TCP.OPTIONS.FIN
beq TCP.IN.JMP.TIMEWT
TCP.IN.2TIMEWT jsr SKT.GetTCB
ldx #3
.1 inc SKT.Cache+S.SOCKET.TCP.INSEQNUM,x
bne .2
dex
bpl .1
.2 ldx #3
.3 inc SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ,x
bne .4
dex
bpl .3
.4 jsr TCP.OUT.SendACK FIN received, Send ACK
bcs TCP.IN.JMP.TIMEWT.RTS
lda #S.SOCKET.TCP.S.TIMEWT
jmp SKT.StoreTCB.S
*--------------------------------------
TCP.IN.JMP.CLOSING
* Wait for SKT.Shutdown
TCP.IN.JMP.TIMEWT
clc Wait for TCP.SendClose
TCP.IN.JMP.TIMEWT.RTS
rts
*--------------------------------------
TCP.IN.ACKTheSYN
ldy #S.TCP.SEQNUM+3 Get Remote SEQ
ldx #3
sec
.3 lda (ZPFrameInPtr),y Set OUTACK=SEQ+1 for new socket...
adc #0
sta SKT.Cache+S.SOCKET.TCP.INSEQNUM,x
dey
dex
bpl .3
rts
*--------------------------------------
TCP.IN.SetDataInPtrAndLen
ldy #S.IP.TOTAL.LENGTH+1
lda (ZPFrameInPtr),y
sec
sbc #S.IP-S.ETH.EII
sta ZPDataInLen
dey
lda (ZPFrameInPtr),y
sbc /S.IP-S.ETH.EII
sta ZPDataInLen+1
ldy #S.TCP.DATAOFFSET
lda (ZPFrameInPtr),y
and #$F0 Get TCP Header len in DWORD
lsr
lsr
sta ZPDataInPtr TMP Storage
lda ZPDataInLen
sec
sbc ZPDataInPtr TMP Storage
sta ZPDataInLen
bcs .1
dec ZPDataInLen+1
.1 lda ZPFrameInPtr
clc
adc #S.IP
pha
lda ZPFrameInPtr+1
adc /S.IP
tax
pla
clc
adc ZPDataInPtr TMP Storage
bcc .2
inx
.2 sta ZPDataInPtr
stx ZPDataInPtr+1
TCP.IN.RTS rts
*--------------------------------------
TCP.SENDCLOSE ldx #0
.1 phx
lda SKT.TABLE,x
beq .8
jsr SKT.GetFD
ldy #S.SOCKET.AF
lda (ZPPtrSKT),y
cmp #AF.INET
bne .8
iny #S.SOCKET.T
lda (ZPPtrSKT),y
cmp #S.SOCKET.T.SEQPKT
bcc .8
tax
ldy #S.SOCKET.TCP.S
lda (ZPPtrSKT),y
cmp #S.SOCKET.TCP.S.TIMEWT
beq .4
cmp #S.SOCKET.TCP.S.ESTBLSH
bne .2
cpx #S.SOCKET.T.SEQPKT
beq .8
jsr SKT.GetTCB
jsr TCP.OUT
bra .8
.2 cmp #S.SOCKET.TCP.S.OPENED
bne .8
jsr SKT.GetTCB
lda #S.TCP.OPTIONS.SYN
jsr TCP.OUT.SendOptA Send SYN
bcs .8 failed ARP lookup....
lda #S.SOCKET.TCP.S.SYNSENT
jsr SKT.StoreTCB.S
bra .8
*--------------------------------------
.4 cpx #S.SOCKET.T.SEQPKT
bne .6
.5 jsr SKT.GetFromQueue
bcs .7
>SYSCALL2 FreeMem
bra .5
.6 ldy #S.SOCKET.SQ.hInMem
jsr TCP.SENDCLOSE.PIPE
ldy #S.SOCKET.SQ.hOutMem
jsr TCP.SENDCLOSE.PIPE
.7 plx
phx
lda SKT.TABLE,x
stz SKT.TABLE,x
>SYSCALL2 freemem
.8 plx
inx
cpx #K.SKTTABLE.SIZE
bne .1
clc
rts
TCP.SENDCLOSE.PIPE
lda (ZPPtrSKT),y
beq .8
.DO AUXPIPE=1
>SYSCALL2 FreeStkObj
.ELSE
>SYSCALL2 freemem
.FIN
.8 rts
*--------------------------------------
TCP.OUT lda SKT.Cache+S.SOCKET.TCP.OUTTOSEND+1
ldy SKT.Cache+S.SOCKET.TCP.OUTTOSEND
bne .1
tax
bne .1
* Y,A=0 : no data to send
ldy #S.SOCKET.TCP.O
lda (ZPPtrSKT),y
bne TCP.OUT.SendOptA a least an option...
clc No data, no flag....exit
.9 rts
.1 cpy #K.TCP.MSS
pha
sbc /K.TCP.MSS OUTDATA > MSS ?
pla
bcc .2 no....keep data len
>LDYAI K.TCP.MSS yes send only MSS
.2 jsr TCP.NewFrame
bcs .9
jsr SKT.GetDataFromSktOut
TCP.OUT.SEQSEND ldy #S.TCP.WINDOW
lda SKT.Cache+S.SOCKET.TCP.INFREE+1
sta (ZPFrameOutPtr),y
iny
lda SKT.Cache+S.SOCKET.TCP.INFREE
sta (ZPFrameOutPtr),y
lda #S.TCP.OPTIONS.ACK+S.TCP.OPTIONS.PSH
jsr TCP.OUT.Send
bcs TCP.OUT.Send.RTS
lda ZPDataOutLen
ldy ZPDataOutLen+1
ldx #S.SOCKET.TCP.OUTNEXTSEQ
jsr TCP.AddAYToSktCacheAtX
jmp SKT.StoreTCB exits with CC
*--------------------------------------
TCP.OUT.SendACK lda #S.TCP.OPTIONS.ACK
TCP.OUT.SendOptA
jsr TCP.SetSocketTCPO
>LDYAI 0
jsr TCP.NewFrame
bcs TCP.OUT.Send.RTS
ldy #S.SOCKET.TCP.INFREE+1
lda (ZPPtrSKT),y
tax
dey
lda (ZPPtrSKT),y
ldy #S.TCP.WINDOW+1
sta (ZPFrameOutPtr),y
dey
txa
sta (ZPFrameOutPtr),y
ldy #S.SOCKET.TCP.O
lda (ZPPtrSKT),y
TCP.OUT.Send ldy #S.TCP.OPTIONS
sta (ZPFrameOutPtr),y
bit #S.TCP.OPTIONS.ACK
beq .2
ldx #3
ldy #S.TCP.ACKNUM+3
.1 lda SKT.Cache+S.SOCKET.TCP.INSEQNUM,x
sta (ZPFrameOutPtr),y
dey
dex
bpl .1
.2 ldx #3
ldy #S.TCP.SEQNUM+3
.3 lda SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ,x
sta (ZPFrameOutPtr),y
dey
dex
bpl .3
clc
* sec DONT Queue if fail
jsr FRM.SendIP
bcs TCP.OUT.Send.RTS
ldy #S.SOCKET.TCP.O
lda #0
sta (ZPPtrSKT),y
* clc
TCP.OUT.Send.RTS
rts
*--------------------------------------
TCP.SetSocketTCPO.ACK
lda #S.TCP.OPTIONS.ACK
TCP.SetSocketTCPO
ldy #S.SOCKET.TCP.O
ora (ZPPtrSKT),y
sta (ZPPtrSKT),y
rts
*--------------------------------------
TCP.NewFrame ldx #S.IP.PROTOCOL.TCP
jsr FRM.NewIP
bcs .9
jsr SKT.SetFrameOutDstIP
jsr SKT.SetFrameOutTCPUDPPorts
ldy #S.TCP.DATAOFFSET
lda #$50 Header size = 5 DWORDS
sta (ZPFrameOutPtr),y
clc
.9 rts
*--------------------------------------
TCP.AddAYToSktCacheAtX
clc
adc SKT.Cache+3,x
sta SKT.Cache+3,x
tya
adc SKT.Cache+2,x
sta SKT.Cache+2,x
bcc .8
inc SKT.Cache+1,x
bne .8
inc SKT.Cache,x
.8 rts
*--------------------------------------
MAN
SAVE usr/src/lib/libtcpip.s.tcp
LOAD usr/src/lib/libtcpip.s
ASM
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