[e2e] UDP length field

[Luigi Rizzo]

> Again, if UDP needed a length field to deal with that, why didn't TCP?

sounds like the reason is just a trivial one: after source and
destination port and the checksum, there were two spare bytes in
the UDP header to keep the 4-byte alignment, so it sounded natural
to use them for something.
The TCP header size on the other hand was already a multiple of 4
so no spares...

	cheers
	luigi

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