Re: [PATCH net v2 1/3] selftests: forwarding: vxlan_bridge_1d: fix test failure with br_netfilter enabled

[Ido Schimmel]

On Fri, Feb 13, 2026 at 01:19:05PM +0000, Aleksei Oladko wrote:
> The test generates VXLAN traffic using mausezahn, where the encapsulated
> inner IPv4 packet contains a zero IP header checksum. After VXLAN
> decapsulation, such packets do not pass sanity checks in br_netfilter
> and are dropped, which causes the test to fail.
> 
> Fix this by calculating and setting a valid IPv4 header checksum for the
> encapsulated packet generated by mausezahn, so that the packet is accepted
> by br_netfilter. Fixed by using the payload_template_calc_checksum() /
> payload_template_expand_checksum() helpers that are only available
> in v6.3 and newer kernels.
> 
> Fixes: a0b61f3d8ebf ("selftests: forwarding: vxlan_bridge_1d: Add an ECN decap test")
> Signed-off-by: Aleksei Oladko <aleksey.oladko@xxxxxxxxxxxxx>

Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxx>