eBPF
What is eBPF?
eBPF (extended Berkeley Packet Filter) is a Linux kernel technology that enables safe execution of sandboxed programs in the kernel to extend observability, networking, and security capabilities without modifying kernel code or loading new kernel modules.
- Mechanism for running sandboxed bytecode in the Linux kernel (kernel extensibility)
- Event-driven attachment to hooks in the kernel and user space for dynamic behavior (event processing)
- Support for high-performance networking functions such as traffic control, load balancing, and packet filtering (networking and traffic management)
- Fine-grained system and application monitoring through programmable tracing and metrics collection (observability and monitoring)
- Enforcement of security policies and runtime checks based on kernel-level visibility (security and policy enforcement)
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More About eBPF
eBPF (extended Berkeley Packet Filter) is a kernel-level programmability framework (kernel extensibility) that allows user-defined programs to run in a sandboxed Virtual Machine (VM) inside the Linux kernel. It addresses the need for dynamic, safe extension of kernel behavior in areas such as observability, networking, and security without patching or recompiling the kernel.
At its core, eBPF consists of a bytecode instruction set, a verifier, a just-in-time (JIT) compiler, and integration with multiple kernel subsystems (kernel architecture). Developers write eBPF programs in a restricted C-like language, which are compiled to eBPF bytecode and then loaded into the kernel via system calls. The eBPF verifier statically analyzes each program to ensure safety properties such as bounded loops and memory access constraints, after which the program may be JIT-compiled to native machine code for execution.
eBPF programs attach to hooks in various kernel and user-space events (event processing), including network packet processing paths, tracepoints, kprobes, uprobes, and cgroup hooks. Through these attachment points, eBPF can implement packet filtering, traffic shaping, load balancing, and encapsulation for container and cloud networking (networking and traffic management). It can also collect low-level metrics, traces, and performance data across processes, containers, and nodes (observability and monitoring).
To exchange state between eBPF programs and user space, the framework provides eBPF maps (data structures) that store key-value data, counters, histograms, connection state, and policy rules (data management). User-space applications interact with these maps via system calls and libraries, enabling control planes and management tools to configure behavior and retrieve telemetry from eBPF programs in real time.
In enterprise environments, eBPF underpins tools and platforms for container-aware networking, service connectivity, intrusion detection, runtime security enforcement, and performance profiling (cloud-native infrastructure). It integrates with common Linux distributions and container orchestration platforms, providing a programmable layer that can be deployed alongside existing infrastructure. Vendors and open-source projects build higher-level solutions on top of eBPF by supplying prepackaged programs, policy languages, and management APIs.
The eBPF ecosystem includes a community and governance structure coordinated through the eBPF Foundation (open-source governance), which focuses on stewardship of core technology, documentation, and interoperability practices. The project aligns with Linux kernel development processes and relies on stable kernel interfaces for its hooks and helper functions. For technical categorization, eBPF can be placed under kernel programmability, cloud-native networking, observability, and runtime security, as it provides a programmable execution environment inside the kernel that supports multiple enterprise infrastructure domains.