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https://github.com/A2osX/A2osX.git
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79 lines
1.5 KiB
Plaintext
79 lines
1.5 KiB
Plaintext
NEW
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AUTO 3,1
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.LIST OFF
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*--------------------------------------
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ICMP.IN ldy #S.ICMP.TYPE
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lda (ZPFrameInPtr),y
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cmp #S.ICMP.TYPE.ECHOREP
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beq ICMP.IN.ECHOREP
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cmp #S.ICMP.TYPE.ECHOREQ
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bne ICMP.IN.EXIT
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*--------------------------------------
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ICMP.IN.ECHOREQ ldy #S.IP.DST+3
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ldx #3
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.1 lda (ZPFrameInPtr),y
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cmp IPCFG+S.IPCFG.IP,x
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bne ICMP.IN.EXIT
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dey
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dex
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bne .1
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ldy #S.ICMP.TYPE
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lda #S.ICMP.TYPE.ECHOREP
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sta (ZPFrameInPtr),y
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jsr ARP.AddFromFrameInPtr
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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
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.2 lda ZPFrameInPtr,x
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sta ZPFrameOutPtr,x
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dex
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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
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dey
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dex
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bpl .3
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clc Queue if fail
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jmp FRM.SendIP
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ICMP.IN.EXIT jmp FRM.DiscardIn
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*--------------------------------------
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ICMP.IN.ECHOREP jsr FRM.GetTargetSKT.RAW
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ldy #S.ICMP.IDENTIFIER
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lda (ZPFrameInPtr),y
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sta SKT.REM.ADDR+S.SOCKADDR.PORT+1
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iny
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lda (ZPFrameInPtr),y
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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
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lda (ZPPtrSKT),y
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cmp #S.IP.PROTOCOL.ICMP
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bne ICMP.IN.EXIT
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lda hFrameIn
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jsr SKT.AddToQueueA
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bcs ICMP.IN.EXIT Q full, discard...
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rts
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*--------------------------------------
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MAN
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SAVE usr/src/lib/libtcpip.s.icmp
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LOAD usr/src/lib/libtcpip.s
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ASM
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