On Fri, Feb 13, 2026 at 01:19:06PM +0000, Aleksei Oladko wrote:
> The test generates VXLAN traffic using mausezahn, where the encapsulated
> inner IPv6 packet has an incorrect payload length set in the IPv6 header.
> 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 setting the correct IPv6 payload length for the encapsulated
> packet generated by mausezahn, so that the packet is accepted
> by br_netfilter.
>
> tools/testing/selftests/net/forwarding/vxlan_bridge_1d_ipv6.sh
> lines 698-706
>
> )"00:03:"$( : Payload length
> )"3a:"$( : Next header
> )"04:"$( : Hop limit
> )"$saddr:"$( : IP saddr
> )"$daddr:"$( : IP daddr
> )"80:"$( : ICMPv6.type
> )"00:"$( : ICMPv6.code
> )"00:"$( : ICMPv6.checksum
> )
>
> Data after IPv6 header:
> • 80: — 1 byte (ICMPv6 type)
> • 00: — 1 byte (ICMPv6 code)
> • 00: — 1 byte (ICMPv6 checksum, truncated)
>
> Total: 3 bytes → 00:03 is correct. The old value 00:08 did not match
> the actual payload size.
>
> Fixes: b07e9957f220 ("selftests: forwarding: Add VxLAN tests with a
> VLAN-unaware bridge for IPv6")
> Signed-off-by: Aleksei Oladko <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
