Function prison_check_ip4

freebsd/netinet/in_jail.c:406–431

}

int
prison_check_ip4(const struct ucred *cred, const struct in_addr *ia)
{
	struct prison *pr;
	int error;

	KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
	KASSERT(ia != NULL, ("%s: ia is NULL", __func__));

	pr = cred->cr_prison;
	if (!(pr->pr_flags & PR_IP4))
		return (0);
	mtx_lock(&pr->pr_mtx);
	if (!(pr->pr_flags & PR_IP4)) {
		mtx_unlock(&pr->pr_mtx);
		return (0);
	}
	if (pr->pr_ip4 == NULL) {
		mtx_unlock(&pr->pr_mtx);
		return (EAFNOSUPPORT);
	}

	error = prison_check_ip4_locked(pr, ia);
	mtx_unlock(&pr->pr_mtx);
	return (error);
}