xfrm_policy_flush
int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
EXPORT_SYMBOL(xfrm_policy_flush);
xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
err = xfrm_policy_flush(net, type, true);