From: Eric Dumazet <eric.duma...@gmail.com> Date: Mon, 11 Dec 2017 07:17:39 -0800
> From: Eric Dumazet <eduma...@google.com> > > IPv4 stack reacts to changes to small MTU, by disabling itself under > RTNL. > > But there is a window where threads not using RTNL can see a wrong > device mtu. This can lead to surprises, in igmp code where it is > assumed the mtu is suitable. > > Fix this by reading device mtu once and checking IPv4 minimal MTU. > > This patch adds missing IPV4_MIN_MTU define, to not abuse > ETH_MIN_MTU anymore. > > Signed-off-by: Eric Dumazet <eduma...@google.com> Applied and queued up for -stable.
