Kernel Hook Interception for Socket Control Information
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Solution Overview
Problem
Existing network devices require extensive and error-prone modifications to operating system networking code to intercept and manipulate control information passed between applications and the kernel, limiting extensibility and flexibility in supporting new functionalities.
Innovation Solution
Implementing loadable kernel modules that register callback functions with the kernel, allowing the kernel to invoke these functions based on specific events, such as the execution of hooks associated with network protocol stacks, enabling interception and manipulation of control information without modifying underlying operating system code.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If extensive modifications are made to operating system networking code to intercept control information, then the ability to manipulate control information is improved, but the complexity and error-proneness of the system increases
Solution Approach 1:
The patent introduces a hook mechanism as an intermediary layer between the kernel and the control information flow. This hook acts as a mediator that intercepts control information without requiring modifications to the core operating system networking code. The hook receives control information from the kernel, allows external modules to manipulate it, and then passes it along, thus resolving the contradiction by providing adaptability through an intermediary rather than through extensive code modifications.
2Adaptability or versatility
If iterative changes are made to operating system network code to support new functionalities, then new functionalities are added, but the risk of errors and system stability issues increases
Solution Approach 1:
The patent segments the functionality by separating the core kernel from the functionality-adding components. Instead of iteratively modifying the kernel code, new functionalities are implemented as separate loadable kernel modules that attach to the kernel through standardized hooks. This segmentation allows new features to be added without touching or risking the stability of the core operating system network code, thus resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The patent implements a dynamic architecture where the kernel can load and unload modules at runtime through hooks. This dynamic capability allows the system to adapt to new functionalities without requiring iterative recompilation or modification of the core kernel code. Modules can be dynamically attached to hooks, executed, and detached, providing adaptability while maintaining the stability of the core system.
3Adaptability or versatility
If the kernel code is modified to intercept control information, then interception capability is improved, but the ease of manufacture and deployment of new functionalities deteriorates
Solution Approach 1:
The patent creates a universal hook interface that can serve multiple functions and multiple modules simultaneously. The hook mechanism is designed as a universal attachment point that any loadable kernel module can utilize to intercept and manipulate control information. This universality means that new functionalities can be deployed by simply creating modules that attach to the existing hook infrastructure, without requiring custom modifications for each function, thus improving ease of manufacture and deployment while maintaining interception capability.
Data Source
AI summary
A device may receive, by a kernel of the device and from a loadable kernel module of the device, information that instructs the kernel to invoke a callback function associated with the loadable kernel module based on an execution of a hook of the kernel. The device may receive, by the kernel of the device and from an application of the device, a socket application programming interface (API) call. The socket API call may include control information. The device may execute, by the kernel of the device, the hook based on receiving the socket API call. The device may invoke, by the kernel of the device, the callback function associated with the loadable kernel module based on executing the hook to permit a functionality associated with the callback function to be provided. The kernel may provide the control information, associated with the socket API call, to the callback function as an argument.