From: Sabrina Dubroca <[email protected]> Date: Mon, 26 Feb 2018 16:13:43 +0100
> According to RFC 1191 sections 3 and 4, ICMP frag-needed messages > indicating an MTU below 68 should be rejected: > > A host MUST never reduce its estimate of the Path MTU below 68 > octets. > > and (talking about ICMP frag-needed's Next-Hop MTU field): > > This field will never contain a value less than 68, since every > router "must be able to forward a datagram of 68 octets without > fragmentation". > > Furthermore, by letting net.ipv4.route.min_pmtu be set to negative > values, we can end up with a very large PMTU when (-1) is cast into u32. > > Let's also make ip_rt_min_pmtu a u32, since it's only ever compared to > unsigned ints. > > Reported-by: Jianlin Shi <[email protected]> > Signed-off-by: Sabrina Dubroca <[email protected]> > Reviewed-by: Stefano Brivio <[email protected]> Applied and queued up for -stable, thanks Sabrina.
