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[ Upstream commit025c65e119] If an xfrmi is associated to a vrf layer 3 master device, xfrm_policy_check() fails after traffic decapsulation. The input interface is replaced by the layer 3 master device, and hence xfrmi_decode_session() can't match the xfrmi anymore to satisfy policy checking. Extend ingress xfrmi lookup to honor the original layer 3 slave device, allowing xfrm interfaces to operate within a vrf domain. Fixes:f203b76d78("xfrm: Add virtual xfrm interfaces") Signed-off-by: Martin Willi <martin@strongswan.org> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>