Packet Filtering at an Application-Processor-to-Modem Interface

摘要

An application processor circuit comprises an interface circuit configured to communicate with a separate modem device, a user application module configured to execute one or more user-installed applications, and a core application module configured to execute one or more core applications and to access one or more modem services on the modem device, using the interface circuit and an IP socket application protocol interface (API), wherein packets sent to the modem device for accessing the one or more modem services include a destination IP address corresponding to the modem device. The application processor circuit further comprises an IP filter module configured to identify and discard outbound packets that include a destination IP address corresponding to the modem device and that originate from any of one or more disallowed applications in the application processor, without sending the identified packets to the modem device.

主权项

1. An application processor circuit (800) comprising:
an interface circuit (810) configured to communicate with a modem device (900); and a processing circuit (820);wherein the processing circuit (820) is configured to:
access one or more modem services on the modem device (900), using the interface circuit (810) and an IP socket application protocol interface (API), wherein packets sent to the modem device (900) for accessing the one or more modem services include a destination IP address corresponding to the modem device (900); and identify and discard outbound packets that include a destination IP address corresponding to the modem device (900) and that originate from any of one or more disallowed applications in the application processor, without sending the identified packets to the modem device (900).