xfrm_sk_policy_insert
int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
xfrm_sk_policy_insert(sk, err, pol);