A2osX/LIB/LIBTCPIP.S.TCP.txt

646 lines
12 KiB
Plaintext
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

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