A2osX/LIB/LIBTCPIP.S.ICMP.txt

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PR#3
PREFIX /A2OSX.SRC
LOMEM $900
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
ICMP.IN ldy #S.ICMP.TYPE
lda (ZPFrameInPtr),y
cmp #S.ICMP.TYPE.ECHOREP
beq ICMP.IN.ECHOREP
cmp #S.ICMP.TYPE.ECHOREQ
bne ICMP.IN.EXIT
*--------------------------------------
ICMP.IN.ECHOREQ ldy #S.IP.DST+3
ldx #3
.1 lda (ZPFrameInPtr),y
cmp IPCFG+S.IPCFG.IP,x
bne ICMP.IN.EXIT
dey
dex
bne .1
ldy #S.ICMP.TYPE
lda #S.ICMP.TYPE.ECHOREP
sta (ZPFrameInPtr),y
ldy #S.IP.SRC+3
ldx #3
.2 lda (ZPFrameInPtr),y
sta ARP.TmpCache+S.ARPCACHE.IP,x
dey
dex
bpl .2
ldy #S.IP.DST+3
ldx #3
.3 lda ARP.TmpCache+S.ARPCACHE.IP,x
sta (ZPFrameInPtr),y
dey
dex
bpl .3
ldy #S.ETH.SRCMAC+5
ldx #5
.4 lda (ZPFrameInPtr),y
sta ARP.TmpCache+S.ARPCACHE.MAC,x
dey
dex
bpl .4
lda #K.ARP.TTL
sta ARP.TmpCache+S.ARPCACHE.TTL
lda /K.ARP.TTL
sta ARP.TmpCache+S.ARPCACHE.TTL+1
lda #S.ARPCACHE.STATUS.RESOLVED
jsr ARP.ADD.I
lda hFrameIn
sta hFrameOut DO NOT DISCARD this frame,it is SOURCE frame!!!
>LDYA ZPFrameInPtr
>STYA ZPFrameOutPtr
jmp FRM.SendIP
ICMP.IN.EXIT lda hFrameIn
>SYSCALL FreeMemA
rts
*--------------------------------------
ICMP.IN.ECHOREP jsr IP.FillSKT.TemplateSrcDst
lda #S.IP.PROTOCOL.ICMP
sta SKT.Template+S.SOCKET.RAW.PROTO
ldy #S.ICMP.IDENTIFIER
lda (ZPFrameInPtr),y
sta SKT.Template+S.SOCKET.DST.PORT+1
iny
lda (ZPFrameInPtr),y
sta SKT.Template+S.SOCKET.DST.PORT
lda hSocketTable
>SYSCALL GetMemPtrA
>STYA ZPPtrSKT
ldx #0
.3 lda (ZPPtrSKT)
beq .7
cmp #S.SOCKET.SOCK.RAW
bne .7
ldy #S.SOCKET.SRC.ADDR
.4 lda (ZPPtrSKT),y
cmp SKT.Template,y
bne .7
iny
cpy #S.SOCKET.SRC.PORT
bne .5
iny
iny
.5 cpy #S.SOCKET.DST.PORT Compare SRC.ADDR,DST.ADDR,DST.PORT
bne .4
lda hFrameIn
jsr SKT.AddToQueueA
bcs .9 Q full, discard...
rts DO NOT Discard this queued frame
.7 lda ZPPtrSKT
clc
adc #S.SOCKET
sta ZPPtrSKT
bcc .8
inc ZPPtrSKT+1
.8 inx
cpx #K.SKTTABLE.SIZE
bne .3
.9 lda hFrameIn
>SYSCALL FreeMemA
rts
*--------------------------------------
ICMP.ComputeChecksum
>PUSHW ZPFrameOutLen
>PUSHWI S.ICMP.TYPE-2
ldy #S.ICMP.CHECKSUM
lda #0
sta (ZPFrameOutPtr),y
iny
sta (ZPFrameOutPtr),y
jsr IP.ComputeChecksum
phy
ldy #S.ICMP.CHECKSUM
sta (ZPFrameOutPtr),y
iny
pla
sta (ZPFrameOutPtr),y
rts
*--------------------------------------
MAN
SAVE LIB/LIBTCPIP.S.ICMP
LOAD LIB/LIBTCPIP.S
ASM