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On 08/10/2025 19:51, Guy Harris wrote:
> On Oct 8, 2025, at 10:33 AM, Francois via tcpdump-workers
> <[email protected]> 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.
That's right.
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