Re: updates needed to print-udp.c.. (was Re: RFC 9868 on Transport Options for UDP)

[Guy Harris <gharris () sonic net>]

On Oct 8, 2025, at 10:33 AM, Francois via tcpdump-workers <tcpdump-workers () lists tcpdump org> wrote:

> On 08/10/2025 18:53, Guy Harris wrote:
>
> > OK, so does this finally make the Length field in the UDP header serve a useful purpose, or was there a purpose for 
> > it *before* this that I didn't know about?
>
> One example on network stacks: Linux, net/ipv4/udp.c and net/ipv6/udp.c: length checks.

But if the UDP header hadn't had a length field in the first place, and the UDP payload always ran to the end of the 
(possibly-reassembled) IP datagram, there wouldn't be a length field to check.
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