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because xfrm policy direction has same value with corresponding flow direction, so this problem is covered. In xfrm_lookup and __xfrm_policy_check, flow_cache_lookup is used to accelerate the lookup. Flow direction is given to flow_cache_lookup by policy_to_flow_dir. When the flow cache is mismatched, callback 'resolver' is called. 'resolver' requires xfrm direction, so convert direction back to xfrm direction. Signed-off-by: Baker Zhang <baker.zhang@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>