A2osX/LIB/LIBTCPIP.S.ICMP.txt

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2017-12-22 21:24:30 +00:00
NEW
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AUTO 3,1
.LIST OFF
*--------------------------------------
ICMP.IN ldy #S.ICMP.TYPE
lda (ZPFrameInPtr),y
cmp #S.ICMP.TYPE.ECHOREP
beq ICMP.IN.ECHOREP
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cmp #S.ICMP.TYPE.ECHOREQ
bne ICMP.IN.EXIT
*--------------------------------------
ICMP.IN.ECHOREQ ldy #S.IP.DST+3
ldx #3
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.1 lda (ZPFrameInPtr),y
cmp IPCFG+S.IPCFG.IP,x
bne ICMP.IN.EXIT
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dey
dex
bne .1
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ldy #S.ICMP.TYPE
lda #S.ICMP.TYPE.ECHOREP
sta (ZPFrameInPtr),y
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jsr ARP.AddFromFrameInPtr
lda hFrameIn
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* stz hFrameIn DO NOT DISCARD this frame,it is SOURCE frame!!!
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sta hFrameOut
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ldx #3
.2 lda ZPFrameInPtr,x
sta ZPFrameOutPtr,x
dex
bpl .2
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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
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clc Queue if fail
jmp FRM.SendIP
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ICMP.IN.EXIT jmp FRM.DiscardIn
*--------------------------------------
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ICMP.IN.ECHOREP jsr FRM.GetTargetSKT.RAW
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ldy #S.ICMP.IDENTIFIER
lda (ZPFrameInPtr),y
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sta SKT.LOC.ADDR+S.SOCKADDR.PORT+1
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sta SKT.REM.ADDR+S.SOCKADDR.PORT+1
iny
lda (ZPFrameInPtr),y
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sta SKT.LOC.ADDR+S.SOCKADDR.PORT
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sta SKT.REM.ADDR+S.SOCKADDR.PORT
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jsr SKT.FindMatchingLocRem
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bcs ICMP.IN.EXIT
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ldy #S.SOCKET.PROTO
lda (ZPPtrSKT),y
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cmp #S.IP.PROTOCOL.ICMP
bne ICMP.IN.EXIT
lda hFrameIn
jsr SKT.AddToQueueA
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bcs ICMP.IN.EXIT Q full, discard...
rts
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*--------------------------------------
MAN
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SAVE usr/src/lib/libtcpip.s.icmp
LOAD usr/src/lib/libtcpip.s
ASM