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A2osX/LIB/LIBTCPIP.S.TCP.txt
Rémy GIBERT d1a8e08a0a Kernel 0.93
2019-05-13 23:10:09 +02:00

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NEW
AUTO 3,1
.LIST OFF
*--------------------------------------
TCP.IN jsr FRM.GetTargetSKT.TCPUDP
jsr SKT.FindMatchingLocRem
bcs TCP.IN.JMP.CLOSED no socket, go discard
ldy #S.SOCKET.PROTO
lda (ZPPtrSKT),y
cmp #S.IP.PROTOCOL.TCP
bne TCP.IN.JMP.CLOSED wrong protocol, 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 SKT.TABLE,x
jsr SKT.shutdown
*--------------------------------------
TCP.IN.JMP.CLOSED
lda hFrameIn
stz hFrameIn
>SYSCALL2 FreeMem
rts
*--------------------------------------
TCP.SENDCLOSE ldx #0
.1 phx
lda SKT.TABLE,x
beq .8
>SYSCALL2 GetMemPtr
>STYA ZPPtrSKT
ldy #S.SOCKET.AF
lda (ZPPtrSKT),y
cmp #AF.INET
bne .8
iny #S.SOCKET.T
lda (ZPPtrSKT),y
cmp #S.SOCKET.T.SEQPACKET
bcc .8
ldy #S.SOCKET.TCP.S
lda (ZPPtrSKT),y
cmp #S.SOCKET.TCP.S.TIMEWT
beq .4
cmp #S.SOCKET.TCP.S.ESTBLSH
bne .8
jsr TCP.OUT
bra .8
.4 ldy #S.SOCKET.SQ.hInMem
lda (ZPPtrSKT),y
>SYSCALL2 freemem
ldy #S.SOCKET.SQ.hOutMem
lda (ZPPtrSKT),y
>SYSCALL2 freemem
plx
phx
lda SKT.TABLE,x
>SYSCALL2 freemem
plx
phx
stz SKT.TABLE,x
.8 plx
inx
cpx #K.SKTTABLE.SIZE
bne .1
.9 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.CLOSED
jsr SKT.AddToQueueA Queued successfully ?
bcs TCP.IN.JMP.CLOSED 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 .99
jsr TCP.IN.ACKTheSYN
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 lda #ERR.SKT.OOS
.99 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
lda #S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOptA SYN.ACK recieved, Send, ACK
bcs .9
lda #S.SOCKET.TCP.S.ESTBLSH
jmp SKT.StoreTCB.S
.9 lda #S.TCP.OPTIONS.RST
jsr TCP.OUT.SendOptA
ldx SKT.Index
lda SKT.TABLE,x
jmp SKT.shutdown
*--------------------------------------
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.OUTSEQNUM,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 .1
jsr SKT.AckDataToSktOut Yes, Discard sent data
jsr SKT.StoreTCB and update SKT
.1 jsr TCP.IN.SetDataInPtrAndLen
lda ZPDataInLen Incoming Data in this frame ?
ora ZPDataInLen+1
beq .2 No data, ...
jsr SKT.AddDataToSktIn yes, queue data if there is room for....
bcs .2
jsr SKT.StoreTCB success, update socket
* jsr TCP.SetSocketTCPO.ACK Try to ACK read DATA
* jsr TCP.OUT.I SKT.GetTCB already called
.2 ldy #S.TCP.OPTIONS
lda (ZPFrameInPtr),y
and #S.TCP.OPTIONS.FIN
beq .8
jsr TCP.IN.ACKTheFIN
lda #S.TCP.OPTIONS.FIN+S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOptA FIN received, Send FIN.ACK
bcs .9
lda #S.SOCKET.TCP.S.CLWAIT
jmp SKT.StoreTCB.S
.8 clc
.9 rts
*--------------------------------------
TCP.IN.JMP.CLWAIT
clc Wait for SKT.shutdown
rts
*--------------------------------------
TCP.IN.JMP.LASTACK
ldy #S.TCP.OPTIONS only accept ACK packet
lda (ZPFrameInPtr),y
bit #S.TCP.OPTIONS.ACK
beq .8
ldy #S.SOCKET.TCP.S
lda #S.SOCKET.TCP.S.TIMEWT
sta (ZPPtrSKT),y
.8 clc
rts
*--------------------------------------
TCP.IN.JMP.FINWT1
jsr SKT.GetTCB
ldy #S.TCP.OPTIONS FIN sent, accept ACK or FIN/ACK packet
lda (ZPFrameInPtr),y
bit #S.TCP.OPTIONS.FIN
bne .1
lda #S.TCP.OPTIONS.FIN+S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOptA Send FIN.ACK
bcs .9
lda #S.SOCKET.TCP.S.FINWT2
jmp SKT.StoreTCB.S
.1 jsr TCP.IN.ACKTheFIN FIN/ACK
lda #S.TCP.OPTIONS.FIN+S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOptA Send FIN.ACK
bcs .9
lda #S.SOCKET.TCP.S.TIMEWT
jmp SKT.StoreTCB.S
* clc
.9 rts
*--------------------------------------
TCP.IN.JMP.FINWT2
ldy #S.TCP.OPTIONS only accept FIN packet
lda (ZPFrameInPtr),y
bit #S.TCP.OPTIONS.FIN
beq .8
jsr SKT.GetTCB
jsr TCP.IN.ACKTheFIN
lda #S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOptA FIN received, Send ACK
bcs .9
lda #S.SOCKET.TCP.S.TIMEWT
jmp SKT.StoreTCB.S
.8 clc
.9 rts
*--------------------------------------
TCP.IN.JMP.CLOSING
ldy #S.TCP.OPTIONS only accept ACK packet
lda (ZPFrameInPtr),y
bit #S.TCP.OPTIONS.ACK
beq .1
ldy #S.SOCKET.TCP.S
lda #S.SOCKET.TCP.S.TIMEWT
sta (ZPPtrSKT),y
.1 clc
rts
*--------------------------------------
TCP.IN.JMP.TIMEWT
clc Wait for TCP.Close
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.INLASTSEQNUM,x
sta SKT.Cache+S.SOCKET.TCP.OUTACKNUM,x
dey
dex
bpl .3
rts
*--------------------------------------
TCP.IN.ACKTheFIN
jsr TCP.SetSocketTCPO.ACK
ldx #3
sec
.2 lda SKT.Cache+S.SOCKET.TCP.INLASTSEQNUM,x
adc #0
sta SKT.Cache+S.SOCKET.TCP.INLASTSEQNUM,x
dex
bpl .2
ldx #3
sec
.3 lda SKT.Cache+S.SOCKET.TCP.OUTACKNUM,x
adc #0
sta SKT.Cache+S.SOCKET.TCP.OUTACKNUM,x
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.OUT jsr SKT.GetTCB
TCP.OUT.I 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
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 TCP.IN.RTS
jsr SKT.GetDataFromSktOut
lda #S.TCP.OPTIONS.ACK+S.TCP.OPTIONS.PSH
jsr TCP.SetSocketTCPO
jsr TCP.OUT.Send
bcs TCP.IN.RTS
lda SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ+3
clc
adc ZPDataOutLen
sta SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ+3
lda SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ+2
adc ZPDataOutLen+1
sta SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ+2
bcc .80
inc SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ+1
bne .80
inc SKT.Cache+S.SOCKET.TCP.OUTNEXTSEQ
.80 jmp SKT.StoreTCB exits with CC
*--------------------------------------
TCP.OUT.SendOptA
jsr TCP.SetSocketTCPO
>LDYAI 0
jsr TCP.NewFrame
bcs TCP.IN.RTS
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.OUTACKNUM,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
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
jsr FRM.SendIP
bcs .9
ldy #S.SOCKET.TCP.O
lda #0
sta (ZPPtrSKT),y
* clc
.9 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
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
clc
.9 rts
*--------------------------------------
MAN
SAVE USR/SRC/LIB/LIBTCPIP.S.TCP
LOAD USR/SRC/LIB/LIBTCPIP.S
ASM
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