Patch 1/3 re-introduces a fix to ensure that default MTU on new link is not lowered unnecessarily because of double counting of headers. This fix was originally introduced in 2014 and got lost in a merge commit shortly afterwards.
Patches 2/3 and 3/3 ensure that MTU passed from userspace on link creation is taken into account and also properly validated. Stefano Brivio (3): vti4: Don't count header length twice on tunnel setup ip_tunnel: Clamp MTU to bounds on new link vti4: Don't override MTU passed on link creation via IFLA_MTU net/ipv4/ip_tunnel.c | 8 +++++++- net/ipv4/ip_vti.c | 2 -- 2 files changed, 7 insertions(+), 3 deletions(-) -- 2.15.1
