Re: [tsvwg] UDP options and header-data split (zero copy)

["C. M. Heard" <[e-mail]>]

On Sun, Aug 1, 2021 at 3:56 PM Joseph Touch <wrote:

> The value in the terminal fragment is just the value that would have been
> in the original IP length before fragmentation, less the IP and UDP headers.
>
> That’s very simple.


That's highly dependent on the details of the implementation,


> Whether it can be used to split off the trailing options requires a simple
> comparison - if FRAG_END > FRAG_OFFSET, then the trailing options are
> entirely in this fragment. If not, then not.
>
> The fact that per-reassembled datagram options look exactly like legacy
> options it similar in its simplicity, as is using TLVs for everything. It’s
> all about fewer different ways to do the same thing.
>

Based on my own experience, I do not agree that this necessarily makes for
a simpler implementation. But let's see what other folks think.

Mike Heard