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There are currently 3 ip tunnels that are capable of carrying L2 traffic: gretap, vxlan and geneve. They all are capable to inherit the TOS/TTL for the outer IP-header from the inner frame. Add a test that verifies that these fields are correctly inherited. These tests failed before the following commits:b09ab9c92e("ip6_tunnel: allow to inherit from VLAN encapsulated IP")3f8a8447fd("ip6_gre: use actual protocol to select xmit")41337f52b9("ip6_gre: set DSCP for non-IP")7ae29fd1be("ip_tunnel: allow to inherit from VLAN encapsulated IP")7074732c8f("ip_tunnels: allow VXLAN/GENEVE to inherit TOS/TTL from VLAN")ca2bb69514("geneve: do not use RT_TOS for IPv6 flowlabel")b4ab94d6ad("geneve: fix TOS inheriting for ipv4") Signed-off-by: Matthias May <matthias.may@westermo.com> Link: https://lore.kernel.org/r/20220817073649.26117-1-matthias.may@westermo.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>