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A2osX/LIB/LIBTCPIP.S.TCP.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $900
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
TCP.IN jsr IP.FillSKT.TemplateSrcDst
ldy #S.TCP.SRCPORT
lda (ZPFrameInPtr),y
sta SKT.Template+S.SOCKET.DST.PORT+1
iny
lda (ZPFrameInPtr),y
sta SKT.Template+S.SOCKET.DST.PORT
ldy #S.TCP.DSTPORT
lda (ZPFrameInPtr),y
sta SKT.Template+S.SOCKET.SRC.PORT+1
iny
lda (ZPFrameInPtr),y
sta SKT.Template+S.SOCKET.SRC.PORT
lda hSocketTable
>SYSCALL GetMemPtrA
>STYA ZPPtrSKT
ldx #0
.3 lda (ZPPtrSKT)
beq .7
cmp #S.SOCKET.SOCK.STREAM
bne .7
ldy #S.SOCKET.SRC.ADDR
.4 lda SKT.Template,y
cmp (ZPPtrSKT),y
bne .7 Not for this socket...
iny
cpy #S.SOCKET.SRC.PORT+2
bne .4
ldy #S.SOCKET.SO
lda (ZPPtrSKT),y
and #S.SOCKET.SO.ACCEPTCONN Listening socket?
beq .5 no, go check if Dst Match
ldy #S.TCP.OPTIONS yes, only accept SYN packet
lda (ZPFrameInPtr),y
cmp #S.TCP.OPTIONS.SYN SYN only, if SYN.ACK, pass to regular socket
beq TCP.IN.JMP.LISTEN
.5 ldy #S.SOCKET.DST.ADDR
.6 lda SKT.Template,y regular socket, check remote ADDR/PORT
cmp (ZPPtrSKT),y
bne .7
iny
cpy #S.SOCKET.DST.PORT+2
bne .6
ldy #S.TCP.OPTIONS
lda (ZPFrameInPtr),y
and #S.TCP.OPTIONS.RST RST ? go Kill this socket.
bne TCP.IN.RST
ldy #S.SOCKET.TCP.STATUS
lda (ZPPtrSKT),y
cmp #S.SOCKET.TCP.STATUS.TIMEWT
bcs *
asl
tax
jmp (L.TCP.IN.JMP,x)
.7 lda ZPPtrSKT
clc
adc #S.SOCKET
sta ZPPtrSKT
bcc .8
inc ZPPtrSKT+1
.8 inx
cpx #K.SKTTABLE.SIZE
bne .3
.9 clc Discard frame
rts
*--------------------------------------
TCP.IN.RST jmp SKT.Destroy
*--------------------------------------
TCP.IN.JMP.LISTEN
lda #S.SOCKET.SOCK.STREAM
sta SKT.Template+S.SOCKET.SOCK
stz SKT.Template+S.SOCKET.SO
stz SKT.Template+S.SOCKET.TCP.STATUS
>PUSHW L.SKT.Template
jsr SKT.New.Listen Assign SEQNUM
bcs .99
sty .1+1
sta .2+1
txa
jsr SKT.AddToQueueA
bcs .99 Queued successfully ?
.1 lda #$ff
sta ZPPtrSKT
.2 lda #$ff
sta ZPPtrSKT+1
ldy #S.TCP.SEQ.NUMBER+3 Get Remote SEQ
ldx #3
sec
.3 lda (ZPFrameInPtr),y Set ACK=SEQ+1 for new socket...
adc #0
sta SKT.TCBCache+S.TCB.ACKNUM,x
sta SKT.TCBCache+S.TCB.LASTSEQ,x
dey
dex
bpl .3
jsr SKT.StoreTCB
jsr ARP.AddFromFrameInPtr
lda #S.TCP.OPTIONS.SYN+S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOpt Send SYN.ACK
bcs .9
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.SYNRCVD
sta (ZPPtrSKT),y
clc
rts
.9 lda #0 error
sta (ZPPtrSKT) clear this socket
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
cmp #S.TCP.OPTIONS.SYN+S.TCP.OPTIONS.ACK
bne .8
jsr SKT.GetTCB
ldx #3
ldy #S.TCP.ACK.NUMBER+3
sec Check if ACK=my SEQ+1
.1 lda SKT.TCBCache+S.TCB.ACKNUM,x
adc #0
sta SKT.TCBCache+S.TCB.ACKNUM,x
eor (ZPFrameInPtr),y
bne .8
dey
dex
bpl .1
lda #S.TCP.OPTIONS.ACK
jsr TCP.OUT.SendOpt
bcs .9
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.ESTBLSH
sta (ZPPtrSKT),y
.8 clc
.9 rts
*--------------------------------------
TCP.IN.JMP.SYNRCVD
ldy #S.TCP.OPTIONS SYN Recieved, 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.ACK.NUMBER+3
sec
.1 lda SKT.TCBCache+S.TCB.SEQNUM,x Check if ACK=my SEQ+1
adc #0
sta SKT.TCBCache+S.TCB.SEQNUM,x
eor (ZPFrameInPtr),y
bne .8
dey
dex
bpl .1
jsr SKT.StoreTCB
bcs .9
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.ESTBLSH
sta (ZPPtrSKT),y
.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....
.2 ldy #S.TCP.OPTIONS
lda (ZPFrameInPtr),y
and #S.TCP.OPTIONS.FIN
beq .8
ldy #S.TCP.OPTIONS
lda (ZPPtrSKT),y
ora #S.TCP.OPTIONS.ACK ACK the FIN....
sta (ZPPtrSKT),y
jsr TCP.OUT.I SKT.GetTCB called, try to ACK the FIN
bcs .9
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.CLWAIT
sta (ZPPtrSKT),y
.8 clc
.9 rts
*--------------------------------------
TCP.IN.JMP.CLWAIT
clc Wait for SKT.CloseA from Daemon
rts
*--------------------------------------
TCP.IN.JMP.LASTACK
ldy #S.TCP.OPTIONS only accept ACK packet
lda (ZPFrameInPtr),y
cmp #S.TCP.OPTIONS.ACK
bne .8
jmp SKT.Destroy
.8 clc
rts
*--------------------------------------
TCP.IN.JMP.FINWT1
ldy #S.TCP.OPTIONS only accept ACK packet
lda (ZPFrameInPtr),y
cmp #S.TCP.OPTIONS.ACK
bne .1
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.FINWT2
sta (ZPPtrSKT),y
clc
rts
.1 cmp #S.TCP.OPTIONS.FIN
bne .8
ldy #S.SOCKET.TCP.OPTIONS
lda (ZPPtrSKT),y
ora #S.TCP.OPTIONS.ACK
sta (ZPPtrSKT),y
jsr TCP.OUT
bcs .9
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.CLOSING
sta (ZPPtrSKT),y
.8 clc
.9 rts
*--------------------------------------
TCP.IN.JMP.FINWT2
ldy #S.TCP.OPTIONS only accept FIN packet
lda (ZPFrameInPtr),y
cmp #S.TCP.OPTIONS.FIN
bne .8
ldy #S.SOCKET.TCP.OPTIONS
lda (ZPPtrSKT),y
ora #S.TCP.OPTIONS.ACK
sta (ZPPtrSKT),y
jsr TCP.OUT
bcs .9
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.TIMEWT
sta (ZPPtrSKT),y
.8 clc
.9 rts
*--------------------------------------
TCP.IN.JMP.CLOSING
ldy #S.TCP.OPTIONS only accept ACK packet
lda (ZPFrameInPtr),y
cmp #S.TCP.OPTIONS.ACK
bne .1
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.TIMEWT
sta (ZPPtrSKT),y
.1 clc
rts
*--------------------------------------
TCP.IN.JMP.TIMEWT
*--------------------------------------
TCP.IN.JMP.CLOSED
clc
rts
*--------------------------------------
TCP.IN.SetDataInPtrAndLen
ldy #S.IP.TOTAL.LENGTH+1
lda (ZPFrameInPtr),y
sec
sbc #S.IP-S.ETH
sta ZPDataInLen
dey
lda (ZPFrameInPtr),y
sbc /S.IP-S.ETH
sta ZPDataInLen+1
ldy #S.TCP.DATAOFFSET
lda (ZPFrameInPtr),y
and #$F0 Get TCP Header len in DWORD
lsr
lsr
sta TmpOffset
lda ZPDataInLen
sec
sbc TmpOffset
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 TmpOffset
bcc .2
inx
.2 sta ZPDataInPtr
stx ZPDataInPtr+1
rts
*--------------------------------------
TCP.OUT jsr SKT.GetTCB
TCP.OUT.I lda SKT.TCBCache+S.TCB.OUTUSED+1
ldy SKT.TCBCache+S.TCB.OUTUSED
bne .1
tax
bne .1
* Y,A=0 : no data to send
ldy #S.SOCKET.TCP.OPTIONS
lda (ZPPtrSKT),y
bne TCP.OUT.SendOpt 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 get only MSS
.2 jsr TCP.NewFrame
bcs TCP.OUT.9
jsr SKT.GetDataFromSktOut
ldy #S.SOCKET.TCP.OPTIONS
lda (ZPPtrSKT),y
jsr TCP.OUT.Send
bcs TCP.OUT.9
lda SKT.TCBCache+S.TCB.SEQNUM+3
clc
adc ZPDataOutLen
sta SKT.TCBCache+S.TCB.SEQNUM+3
lda SKT.TCBCache+S.TCB.SEQNUM+2
adc ZPDataOutLen+1
sta SKT.TCBCache+S.TCB.SEQNUM+2
bcc .80
inc SKT.TCBCache+S.TCB.SEQNUM+1
bne .80
inc SKT.TCBCache+S.TCB.SEQNUM
.80 jmp SKT.StoreTCB
TCP.OUT.9 rts
*--------------------------------------
TCP.OUT.SendOpt sta .1+1
>LDYAI 0
jsr TCP.NewFrame
bcs TCP.OUT.9
.1 lda #$ff
TCP.OUT.Send ldy #S.TCP.OPTIONS
sta (ZPFrameOutPtr),y
bit #S.TCP.OPTIONS.ACK
* beq .1
ldx #3
ldy #S.TCP.ACK.NUMBER+3
.10 lda SKT.TCBCache+S.TCB.ACKNUM,x
sta (ZPFrameOutPtr),y
dey
dex
bpl .10
.1 ldx #3
ldy #S.TCP.SEQ.NUMBER+3
.2 lda SKT.TCBCache+S.TCB.SEQNUM,x
sta (ZPFrameOutPtr),y
dey
dex
bpl .2
ldy #S.TCP.WINDOW
lda SKT.TCBCache+S.TCB.INFREE+1
sta (ZPFrameOutPtr),y
iny
lda SKT.TCBCache+S.TCB.INFREE
sta (ZPFrameOutPtr),y
jsr FRM.SendIP
bcs .9
ldy #S.SOCKET.TCP.OPTIONS
lda (ZPPtrSKT),y
bit #S.TCP.OPTIONS.FIN
beq .8
ldy #S.SOCKET.TCP.STATUS
lda #S.SOCKET.TCP.STATUS.FINWT1
sta (ZPPtrSKT),y
.8 ldy #S.SOCKET.TCP.OPTIONS
lda #0
sta (ZPPtrSKT),y
clc
.9 rts
*--------------------------------------
TCP.NewFrame ldx #S.IP.PROTOCOL.TCP
jsr FRM.NewIP
bcs .9
jsr SKT.SetFrameOutDstIP
ldy #S.SOCKET.SRC.PORT
lda (ZPPtrSKT),y
tax
iny
lda (ZPPtrSKT),y
ldy #S.TCP.SRCPORT
sta (ZPFrameOutPtr),y
iny
txa
sta (ZPFrameOutPtr),y
ldy #S.SOCKET.DST.PORT
lda (ZPPtrSKT),y
tax
iny
lda (ZPPtrSKT),y
ldy #S.TCP.DSTPORT
sta (ZPFrameOutPtr),y
iny
txa
sta (ZPFrameOutPtr),y
ldy #S.TCP.DATAOFFSET
lda #$50 Header size = 5 DWORDS
sta (ZPFrameOutPtr),y
ldy #S.TCP.WINDOW
lda SKT.TCBCache+S.TCB.INFREE+1
sta (ZPFrameOutPtr),y
iny
lda SKT.TCBCache+S.TCB.INFREE
sta (ZPFrameOutPtr),y
clc
.9 rts
*--------------------------------------
TCP.ComputeChecksum
lda #0 RESET.TCP.CHECKSUM
ldy #S.TCP.CHECKSUM
sta (ZPFrameOutPtr),y
iny
sta (ZPFrameOutPtr),y
>LDYA ZPFrameOutPtr
>STYA ZPTmpPtr1
lda ZPFrameOutLen
sec
sbc #S.IP-2
sta ZPDataInLen
lda ZPFrameOutLen+1
sbc /S.IP-2
sta ZPDataInLen+1
clc
* lda ZPDataInLen+1
* adc #0 RESERVED (all zero)
sta IP.CHECKSUM
lda ZPDataInLen
adc #S.IP.PROTOCOL.TCP
sta IP.CHECKSUM+1
ldy #S.IP.SRC
ldx #4 4 words for SRC & DST IP
.10 lda (ZPFrameOutPtr),y
adc IP.CHECKSUM
sta IP.CHECKSUM
iny
lda (ZPFrameOutPtr),y
adc IP.CHECKSUM+1
sta IP.CHECKSUM+1
iny
dex
bne .10
ldy #S.IP
lda ZPDataInLen
eor #$ff
tax
lda ZPDataInLen+1
eor #$ff
pha
.1 inx
bne .11
pla
inc
beq .8
pha
.11 lda (ZPTmpPtr1),y
adc IP.CHECKSUM
sta IP.CHECKSUM
iny
bne .20
inc ZPTmpPtr1+1
.20 inx
bne .2
pla
inc
beq .7
pha
.2 lda (ZPTmpPtr1),y
adc IP.CHECKSUM+1
sta IP.CHECKSUM+1
iny
bne .1
inc ZPTmpPtr1+1
bra .1
.7 adc IP.CHECKSUM+1 A=0 from beq .7
sta IP.CHECKSUM+1
.8 ldy #S.TCP.CHECKSUM
lda IP.CHECKSUM
adc #0 Don't forget to add last carry!!!
eor #$FF
sta (ZPFrameOutPtr),y
iny
lda IP.CHECKSUM+1
adc #0 Don't forget to add last carry!!!
eor #$FF
sta (ZPFrameOutPtr),y
rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/LIB/LIBTCPIP.S.TCP
LOAD /A2OSX.SRC/LIB/LIBTCPIP.S
ASM
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