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Drop bogus IPv6 messages

Ralf Haferkamp requested to merge rhafer/libslirp:ip6_payload_len into master

Drop IPv6 message shorter than what's mentioned in the payload length header (+ the size of the IPv6 header). They're invalid an could lead to data leakage in icmp6_send_echoreply().

This is an alternative fix to !42 (closed) (+ also addresses the MTU comment raised there)

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