bool bt_mesh_net_iv_update()

in nimble/host/mesh/src/net.c [244:351]

• 81 lines of code
• 22 McCabe index (conditional complexity)

bool bt_mesh_net_iv_update(uint32_t iv_index, bool iv_update)
{
	if (atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS)) {
		/* We're currently in IV Update mode */

		if (iv_index != bt_mesh.iv_index) {
			BT_WARN("IV Index mismatch: 0x%08x != 0x%08x",
				(unsigned) iv_index,
				(unsigned) bt_mesh.iv_index);
			return false;
		}

		if (iv_update) {
			/* Nothing to do */
			BT_DBG("Already in IV Update in Progress state");
			return false;
		}
	} else {
		/* We're currently in Normal mode */

		if (iv_index == bt_mesh.iv_index) {
			BT_DBG("Same IV Index in normal mode");
			return false;
		}

		if (iv_index < bt_mesh.iv_index ||
		    iv_index > bt_mesh.iv_index + 42) {
			BT_ERR("IV Index out of sync: 0x%08x != 0x%08x",
			       (unsigned) iv_index,
			       (unsigned) bt_mesh.iv_index);
			return false;
		}

		if ((iv_index > bt_mesh.iv_index + 1) ||
		(iv_index == bt_mesh.iv_index + 1 && !iv_update)) {
			if (ivi_was_recovered) {
				BT_ERR("IV Index Recovery before minimum delay");
				return false;
			}
			/* The Mesh profile specification allows to initiate an
			 * IV Index Recovery procedure if previous IV update has
			 * been missed. This allows the node to remain
			 * functional.
			 */
			BT_WARN("Performing IV Index Recovery");
			ivi_was_recovered = true;
			bt_mesh_rpl_clear();
			bt_mesh.iv_index = iv_index;
			bt_mesh.seq = 0;
			goto do_update;
		}
	}

	if (!(IS_ENABLED(CONFIG_BT_MESH_IV_UPDATE_TEST) &&
	      atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_TEST))) {
		if (bt_mesh.ivu_duration < BT_MESH_IVU_MIN_HOURS) {
			BT_WARN("IV Update before minimum duration");
			return false;
		}
	}

	/* Defer change to Normal Operation if there are pending acks */
	if (!iv_update && bt_mesh_tx_in_progress()) {
		BT_WARN("IV Update deferred because of pending transfer");
		atomic_set_bit(bt_mesh.flags, BT_MESH_IVU_PENDING);
		return false;
	}

	if (iv_update) {
		bt_mesh.iv_index = iv_index;
		BT_DBG("IV Update state entered. New index 0x%08x",
		       (unsigned) bt_mesh.iv_index);

		bt_mesh_rpl_reset();
		ivi_was_recovered = false;
	} else {
		BT_DBG("Normal mode entered");
		bt_mesh.seq = 0;
	}

do_update:
	atomic_set_bit_to(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS, iv_update);
	bt_mesh.ivu_duration = 0U;

	k_work_reschedule(&bt_mesh.ivu_timer, BT_MESH_IVU_TIMEOUT);

	/* Notify other modules */
	if (IS_ENABLED(CONFIG_BT_MESH_FRIEND)) {
		bt_mesh_friend_sec_update(BT_MESH_KEY_ANY);
	}

	bt_mesh_subnet_foreach(bt_mesh_beacon_update);

	if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) &&
	    bt_mesh_gatt_proxy_get() == BT_MESH_GATT_PROXY_ENABLED) {
		bt_mesh_proxy_beacon_send(NULL);
	}

	if (MYNEWT_VAL(BLE_MESH_CDB)) {
		bt_mesh_cdb_iv_update(iv_index, iv_update);
	}

	if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
		store_iv(false);
	}

	return true;
}