Electronic control apparatus, monitoring method, recording medium, and gateway apparatus
View Patent ↗An electronic control apparatus includes: an obtaining unit configured to obtain data transmitted via a network in a system; and a judging unit configured to judge presence or absence of an anomaly in the data obtained by the obtaining unit, based on a transmission state of the data. The judging unit is configured to judge that an anomaly is present in the data, when the transmission state of the data is a transmission stopped state.
1. An electronic control apparatus, comprising:
an obtaining unit configured to obtain data transmitted via a network in a system;
a determination unit configured to determine, based on the data obtained by the obtaining unit, a transmission state of the data;
a judging unit configured to judge presence or absence of an anomaly in the data obtained by the obtaining unit, based on the transmission state of the data; and
an informing apparatus informs a user of a judgment result, wherein
the judging unit is configured to judge that an anomaly is present in the data, when the transmission state of the data is a transmission stopped state,
the determination unit is configured to determine, based on first data obtained by the obtaining unit, a transmission state of second data whose transmission source is an information processor that is a destination of the first data, and
the judging unit is configured to judge that an anomaly is present in the second data, when the transmission state of the second data obtained by the obtaining unit is the transmission stopped state.
2. The electronic control apparatus according to claim 1 , wherein
the first data includes an instruction instructing the information processor to execute or stop transmission of data, and
the determination unit is configured to determine that the transmission state of the second data is a transmission execution state or the transmission stopped state in accordance with the instruction included in the first data.
3. The electronic control apparatus according to claim 1 , wherein
when third data cyclically outputted by an information processor communicatively coupled to the network is not obtained for a predetermined period, the determination unit is configured to determine that a transmission state of the third data is the transmission stopped state; and
when the transmission state of the third data obtained by the obtaining unit is the transmission stopped state, the judging unit is configured to judge that an anomaly is present in the third data.
4. The electronic control apparatus according to claim 1 , wherein
when third data cyclically outputted by an information processor communicatively coupled to the network is not obtained for a predetermined period, the determination unit is configured to determine that a transmission state of fourth data is the transmission stopped state, the fourth data being different from the third data whose transmission source is the information processor, and
when the transmission state of the fourth data obtained by the obtaining unit is the transmission stopped state, the judging unit is configured to judge that an anomaly is present in the fourth data.
5. The electronic control apparatus according to claim 4 , wherein
the determination unit is configured to determine that the transmission state of the fourth data is a transmission execution state or the transmission stopped state in accordance with an instruction included in fifth data whose destination is the information processor,
the fifth data includes the instruction instructing the information processor to execute or stop transmission of data, and
when the transmission state of the fourth data obtained by the obtaining unit is the transmission stopped state, the judging unit is configured to judge that an anomaly is present in the fourth data.
6. The electronic control apparatus according to claim 1 , further comprising:
a storage unit configured to store, in association with one another, i) an identifier of an information processor communicatively coupled to the network, ii) data whose transmission source is the information processor, and iii) the transmission state of the data whose transmission source is the information processor, wherein
the determination unit is configured to change the transmission state stored in the storage unit using the transmission state determined by the determination unit, and
the judging unit is configured to perform judgment based on the transmission state stored in the storage unit.
7. The electronic control apparatus according to claim 1 , further comprising:
a storage unit that stores, in association with one another, i) the data transmitted between a plurality of information processors communicatively coupled to the network and ii) the transmission state of the data, wherein
the determination unit is configured to change the transmission state stored in the storage unit using the transmission state determined by the determination unit, and
the judging unit is configured to perform judgment based on the transmission state stored in the storage unit.
8. The electronic control apparatus according to claim 1 , wherein
when a power supply of an information processor communicatively coupled to the network is in an ON state, the determination unit is configured to determine that data whose transmission source is the information processor is in a transmission execution state, and
when the power supply of the information processor is in an OFF state, the determination unit is configured to determine that the data whose transmission source is the information processor is in the transmission stopped state.
9. The electronic control apparatus according to claim 1 , wherein
when a state of an information processor is a diagnostic mode or a program updating mode, the determination unit is configured to determine that data whose transmission source is the information processor is in the transmission stopped state.
10. The electronic control apparatus according to claim 1 , wherein
the network is a bus network including a plurality of buses,
the electronic control apparatus is provided for a plurality of buses, and
the obtaining unit of the electronic control apparatus is configured to obtain data from the plurality of buses.
11. The electronic control apparatus according to claim 1 , wherein
the network is a bus network including a plurality of buses,
a plurality of electronic control apparatuses are provided for the plurality of buses, the plurality of electronic control apparatuses each being the electronic control apparatus, and
the obtaining unit in each of the plurality of the electronic control apparatuses is configured to obtain data from each of the plurality of buses.
12. A monitoring method performed by an electronic control apparatus, the monitoring method comprising:
obtaining data transmitted via a network in a system;
determining, based on the data obtained, a transmission state of the data;
judging that an anomaly is present in the data obtained, when the transmission state of the data is a transmission stopped state;
determining, based on first data obtained, a transmission state of second data whose transmission source is an information processor that is a destination of the first data;
judging that an anomaly is present in the second data, when the transmission state of the second data obtained by the obtaining unit is the transmission stopped state; and
informing, via an informing apparatus, a user of a judgment result.
13. A non-transitory computer-readable recording medium for use in a computer, the non-transitory computer-readable recording medium having a computer program recorded thereon for causing the computer to execute:
obtaining data transmitted via a network in a system;
determining, based on the data obtained, a transmission state of the data;
judging that an anomaly is present in the data obtained, when the transmission state of the data is a transmission stopped state;
determining, based on first data obtained, a transmission state of second data whose transmission source is an information processor that is a destination of the first data;
judging that an anomaly is present in the second data, when the transmission state of the second data obtained by the obtaining unit is the transmission stopped state; and
informing, via an informing apparatus, a user of a judgment result.
14. A gateway apparatus, comprising:
an obtaining unit configured to obtain data transmitted via a network in a system;
a determination unit configured to determine, based on the data obtained by the obtaining unit, a transmission state of the data;
a judging unit configured to judge that an anomaly is present in the data obtained by the obtaining unit, when the transmission state of the data is a transmission stopped state;
an informing apparatus configured to inform a user of a judgment result; and
a transfer unit configured to stop information processor transmitted data, when the judging unit judges that the anomaly is present in the data,
wherein
the determination unit is configured to determine, based on first data obtained by the obtaining unit, a transmission state of second data whose transmission source is an information processor that is a destination of the first data, and
the judging unit is configured to judge that an anomaly is present in the second data, when the transmission state of the second data obtained by the obtaining unit is the transmission stopped state.