Function mac_socket_label_alloc

freebsd/security/mac/mac_socket.c:102–122

 */

struct label *
mac_socket_label_alloc(int flag)
{
	struct label *label;
	int error;

	label = mac_labelzone_alloc(flag);
	if (label == NULL)
		return (NULL);

	if (flag & M_WAITOK)
		MAC_POLICY_CHECK(socket_init_label, label, flag);
	else
		MAC_POLICY_CHECK_NOSLEEP(socket_init_label, label, flag);
	if (error) {
		MAC_POLICY_PERFORM_NOSLEEP(socket_destroy_label, label);
		mac_labelzone_free(label);
		return (NULL);
	}
	return (label);
}

static struct label *
mac_socketpeer_label_alloc(int flag)