A2osX/LIB/LIBTCPIP.S.IP.txt
2018-10-08 17:41:00 +02:00

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NEW
PREFIX /A2OSX.BUILD
AUTO 4,1
.LIST OFF
*--------------------------------------
IP.IN ldy #S.IP.PROTOCOL
lda (ZPFrameInPtr),y
cmp #S.IP.PROTOCOL.ICMP
bne .2
jmp ICMP.IN
.2 cmp #S.IP.PROTOCOL.UDP
bne .3
jmp UDP.IN
.3 cmp #S.IP.PROTOCOL.TCP
bne .9
jsr TCP.IN TCP will NOT discard FrameIn
.9 lda hFrameIn
beq .8
>SYSCALL FreeMem
rts
.8 clc
rts
*--------------------------------------
IP.ComputeICMPChecksum
stz IP.CHECKSUM
stz IP.CHECKSUM+1
lda ZPFrameOutLen
sec
sbc #S.IP
eor #$ff
tax
lda ZPFrameOutLen+1
sbc /S.IP
eor #$ff
ldy #S.ICMP.CHECKSUM
clc
jmp IP.ComputeChecksum
*--------------------------------------
IP.ComputeUDPChecksum
clc
ldy #S.UDP.LENGTH+1
lda (ZPFrameOutPtr),y
adc #S.IP.PROTOCOL.UDP
sta IP.CHECKSUM+1
dey
lda (ZPFrameOutPtr),y
adc /S.IP.PROTOCOL.UDP (all zero)
sta IP.CHECKSUM
jsr IP.AddSrcDstIPToChecksum
ldy #S.UDP.LENGTH+1
lda (ZPFrameOutPtr),y
eor #$ff
tax
dey
lda (ZPFrameOutPtr),y
eor #$ff
ldy #S.UDP.CHECKSUM
bra IP.ComputeChecksum
*--------------------------------------
IP.ComputeTCPChecksum
lda ZPFrameOutLen
sec
sbc #S.IP
sta ZPDataInLen
lda ZPFrameOutLen+1
sbc /S.IP
sta ZPDataInLen+1
clc
* lda ZPDataInLen+1
* adc /S.IP.PROTOCOL.TCP (all zero)
sta IP.CHECKSUM
lda ZPDataInLen
adc #S.IP.PROTOCOL.TCP
sta IP.CHECKSUM+1
jsr IP.AddSrcDstIPToChecksum
lda ZPDataInLen
eor #$ff
tax
lda ZPDataInLen+1
eor #$ff
ldy #S.TCP.CHECKSUM
*--------------------------------------
* X,A = !ByteCount, Y = Offset in Frame
*--------------------------------------
IP.ComputeChecksum
phy Save Offset
pha Save !ByteCount.HI
lda #0 Reset Checksum
sta (ZPFrameOutPtr),y
iny
sta (ZPFrameOutPtr),y
>LDYA ZPFrameOutPtr
>STYA ZPTmpPtr1
ldy #S.IP
.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 ply
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
*--------------------------------------
IP.AddSrcDstIPToChecksum
ldy #S.IP.SRC
ldx #4 4 words for SRC & DST IP
.1 lda (ZPFrameOutPtr),y
adc IP.CHECKSUM
sta IP.CHECKSUM
iny
lda (ZPFrameOutPtr),y
adc IP.CHECKSUM+1
sta IP.CHECKSUM+1
iny
dex
bne .1
rts
*--------------------------------------
IP.SetDestMAC ldy #S.IP.DST
lda (ZPFrameOutPtr),y
iny
.1 and (ZPFrameOutPtr),y
iny
cpy #S.IP.DST+4
bne .1
cmp #$FF
bne .3 not a broadcast....
ldy #S.ETH.DSTMAC
.2 sta (ZPFrameOutPtr),y
iny
cpy #S.ETH.DSTMAC+6
bne .2
clc
rts
.3 ldy #S.IP.DST+3
ldx #3
.4 lda (ZPFrameOutPtr),y
eor IPCFG+S.IPCFG.IP,x
and IPCFG+S.IPCFG.MASK,x
bne .6
dey
dex
bpl .4
ldy #S.IP.DST+3 Same network, query ARP for dest IP
ldx #3
.5 lda (ZPFrameOutPtr),y
sta ARP.TmpCache+S.ARPCACHE.IP,x
dey
dex
bpl .5
bra .8
.6 ldx #3 Not Same network, query ARP for GW
.7 lda IPCFG+S.IPCFG.GW,x
sta ARP.TmpCache+S.ARPCACHE.IP,x
dex
bpl .7
.8 jsr ARP.QUERY.I
bcs .99
ldx #5
ldy #S.ETH.DSTMAC+5
.11 lda ARP.TmpCache+S.ARPCACHE.MAC,x
sta (ZPFrameOutPtr),y
dey
dex
bpl .11
clc
.99 rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/LIB/LIBTCPIP.S.IP
LOAD /A2OSX.SRC/LIB/LIBTCPIP.S
ASM