Mark Andrews writes:
>
> In message <21882.15475.138790.416...@gro.dd.org>, Dave Lawrence writes:
> > Tony Finch writes:
> > > Wouldn't it be much simpler to use the normal fixed address length, so
> > > that serializers and parsers can just choose a bcopy based on the address
> > > family?
> >
> > Simple in its way, yes, but of course there still has to be packet
> > parsing checks based on declared lengths. That's where I'm not seeing
> > that SHOULD versus MUST is making any sort of meaningful
> > implementation complexity difference.
> >
> > Also, when every byte counts for possibly having to end up doing tcp
> > fallback, saving one might make a difference of not having to do that.
>
> bytes = (bits + 7) / 8
The is what you do for MUST.
if (bytes != length)
FORMERR;
> /* check lsb bits are zero */
> if (bits % 8 != 0) {
> mask = ~0 << (8 - bits % 8);
> if ((x[bytes - 1] & mask) != x[bytes - 1])
> FORMERR;
> }
>
> /* check additional octets allowed by SHOULD are zero */
> for (i = bytes; i < length; i++)
> if (x[i] != 0)
> FORMERR;
>
> > _______________________________________________
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> > DNSOP@ietf.org
> > https://www.ietf.org/mailman/listinfo/dnsop
> --
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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