ipsec_get_reqlevel
if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
u_int ipsec_get_reqlevel(const struct ipsecrequest *);
KASSERTMSG(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
ipsec_get_reqlevel(isr));
level = ipsec_get_reqlevel(isr);