A2osX/LIB/LIBTCPIP.S.ICMP.txt

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2017-12-22 21:24:30 +00:00
NEW
PREFIX /A2OSX.BUILD
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AUTO 4,1
.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
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jsr ARP.AddFromFrameInPtr
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lda hFrameIn
stz hFrameIn DO NOT DISCARD this frame,it is SOURCE frame!!!
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sta hFrameOut
>LDYA ZPFrameInPtr
>STYA ZPFrameOutPtr
ldx #3
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ldy #S.IP.DST+3
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.3 lda ARP.TmpCache+S.ARPCACHE.IP,x
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sta (ZPFrameOutPtr),y
dey
dex
bpl .3
jmp FRM.SendIP
ICMP.IN.EXIT lda hFrameIn
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beq .8
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>SYSCALL FreeMem
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stz hFrameIn
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.8 rts
*--------------------------------------
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ICMP.IN.ECHOREP jsr FRM.GetTargetSKT.RAW
ldy #S.ICMP.IDENTIFIER
lda (ZPFrameInPtr),y
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sta SKT.LOC.ADDR+S.SOCKADDR.PORT+1
iny
lda (ZPFrameInPtr),y
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sta SKT.LOC.ADDR+S.SOCKADDR.PORT
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jsr SKT.FindMatchingLocRem
bcs .9
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>STYA ZPPtrSKT
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ldy #S.SOCKET.PROTO
lda (ZPPtrSKT),y
ldy #S.SOCKET.PROTO
lda (ZPPtrSKT),y
cmp #S.IP.PROTOCOL.ICMP
bne .9
lda hFrameIn
jsr SKT.AddToQueueA
bcc .8
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.9 lda hFrameIn Q full, discard...
>SYSCALL FreeMem
.8 rts
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*--------------------------------------
MAN
SAVE /A2OSX.SRC/LIB/LIBTCPIP.S.ICMP
LOAD /A2OSX.SRC/LIB/LIBTCPIP.S
ASM