]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
net: ip_tunnel: fix mtu calculation for ETHER tunnel devices
authorHangbin Liu <liuhangbin@gmail.com>
Fri, 9 Jul 2021 03:45:02 +0000 (11:45 +0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 9 Jul 2021 20:53:53 +0000 (13:53 -0700)
commit9992a078b1771da354ac1f9737e1e639b687caa2
treeebbff5d36d7650cc6db1114e5011f9a36c8ed44b
parent28b34f01a73435a754956ebae826e728c03ffa38
net: ip_tunnel: fix mtu calculation for ETHER tunnel devices

Commit 28e104d00281 ("net: ip_tunnel: fix mtu calculation") removed
dev->hard_header_len subtraction when calculate MTU for tunnel devices
as there is an overhead for device that has header_ops.

But there are ETHER tunnel devices, like gre_tap or erspan, which don't
have header_ops but set dev->hard_header_len during setup. This makes
pkts greater than (MTU - ETH_HLEN) could not be xmited. Fix it by
subtracting the ETHER tunnel devices' dev->hard_header_len for MTU
calculation.

Fixes: 28e104d00281 ("net: ip_tunnel: fix mtu calculation")
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ip_tunnel.c