> > 1) only fe80::my-id
> > 2) or fe80:x:my-id, where x can be anything.
>
> I guess you are looking at KAME code. if so, please read through
> the following URL, section 1.3. (1) is the legal one, (2) is
> used in KAME kernel internally and should never appear on wire
> nor userland API.
Yes, I know (1) is the legal. To rephrase: what should I do with the
illegal (2) variant? [stack must handle any incoming stuff, even if
illegal].
The address obviously belongs to my host, there cannot be any other
host having such address. To drop it, I have to do the additional
check for x=0 specially. Could also just leave the test out, and treat
is as legal packet.
The choice in here fixes possible future uses of those bits.
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