UDP packet and INVALID state

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Hello all,

What are the possible conditions for a UDP packet to have the INVALID
state but still be accepted by the destination ?

I already found a previous reply from Jozsef Kadlecsik mentionning the
following conditions :

- the header is too small, truncated or malformed, etc.) ;
- the IP addresses or the protocol parameters (ports) for a unique
  tuple (src ip, dst ip, proto, src "port", dst "port") cannot be
  extracted from the packet.

But wouldn't that also make the destination discard the packet ?

Are there other conditions ?
Maybe if the conntrack table is full ?

Thanks for all insights.
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