Kernel Socket Layer Introspection via Filter Hooks
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Solution Overview
Problem
Current network introspection methods are resource-intensive and limited in their ability to gather information about socket operations, as they typically process packets at the transport or network layer, which is computationally expensive and does not provide adequate visibility into pre-operation and post-operation events in the user and kernel memory spaces.
Innovation Solution
Implementing socket operation filter hooks at the socket layer in the kernel memory space to intercept and filter socket operations, allowing for greater versatility in gathering information about network events, including pre-operation and post-operation events, without the need to parse packet headers, thereby reducing resource intensity and enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If network introspection is performed at the transport or network layer by processing packets, then information about network events can be gathered, but computational overhead is high and resource consumption increases
Solution Approach 1:
The patent shifts the introspection point from the traditional transport/network layer (lower dimension in network stack) to the socket layer (higher dimension closer to application). This dimensional change in the network stack allows capturing socket operation events directly at the kernel socket layer, providing comprehensive visibility while avoiding expensive packet parsing operations.
Solution Approach 2:
The patent extracts the introspection function from packet processing at the transport layer and relocates it to socket operation filtering at the socket layer. This extraction separates the information gathering function from the computationally intensive packet parsing, achieving visibility into network events without the associated computational overhead.
2Loss of information
If packet parsing is performed at the transport or network layer, then network event information can be obtained, but the process is computationally expensive
Solution Approach 1:
The patent implements socket operation filter hooks that are registered in advance at the socket layer. These hooks are pre-positioned to intercept socket operations before they occur, allowing the system to capture network event information at the source without needing to perform expensive post-hoc packet parsing at the transport layer.
Solution Approach 2:
The patent introduces socket operation filter hooks as intermediary components between the socket operations and the introspection system. These hooks act as mediators that capture socket operation events directly, providing network event information without requiring the computationally expensive packet parsing that would otherwise be necessary.
3Loss of information
If socket operation filter hooks are implemented at the socket layer, then visibility into pre-operation and post-operation events is improved, but system complexity increases
Solution Approach 1:
The patent implements a dynamic hook registration mechanism where socket operation filter hooks can be registered and unregistered at runtime. This dynamic approach allows the system to add introspection capabilities only when needed, rather than hardcoding complex filtering logic throughout the socket layer, thereby managing system complexity while maintaining improved visibility.
Solution Approach 2:
The patent creates a universal socket operation filter hook interface that can handle multiple socket operations (connect, accept, send, receive, etc.) through a unified mechanism. This multi-functional approach consolidates what would otherwise require separate complex filtering logic for each socket operation, improving visibility while controlling system complexity through code reuse and standardization.
Data Source
AI summary
According to examples of the present disclosure, a method is provided to perform network introspection in an operating system that comprises a user memory space and a kernel memory space. The method may comprise, in response to an initiation of a socket operation, filtering the socket operation at a socket layer in the kernel memory space using a socket operation filter hook associated with the socket operation. The method may further comprise performing an introspection action associated with the socket operation filtered using the socket operation filter hook.