ebpf-packet-redirect

Implements packet redirection and routing logic in eBPF programs.

1|Updated Oct 17, 2024

Search Tags:#routing #networking #ebpf #packet redirection #cnf #bpf_redirect_neigh

Ready to run

npx skills add https://github.com/cassamajor/xcnf --skill ebpf-packet-redirect

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: ebpf-packet-redirect
Source: https://github.com/cassamajor/xcnf/tree/main/.claude/skills/ebpf-packet-redirect
Command: npx skills add https://github.com/cassamajor/xcnf --skill ebpf-packet-redirect

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the complexity of managing packet forwarding in eBPF-based Cloud-Native Functions (CNFs) by providing tools and examples for implementing sophisticated routing logic.

Core Features & Use Cases

Packet Redirection: Implement basic and neighbor-aware packet redirection using bpf_redirect and bpf_redirect_neigh.
Policy Routing: Define source-based policy routing, map-based routing tables, and dynamic route updates.
Advanced Patterns: Includes load balancing, conditional routing, policy chaining, and IPv6 support.
Use Case: Build custom routers, gateways, load balancers, or service mesh sidecars that require fine-grained control over packet forwarding paths.

Quick Start

Use the ebpf-packet-redirect skill to implement source-based policy routing for IPv4 traffic.

Frequently Asked Questions about ebpf-packet-redirect

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I implement source-based policy routing in eBPF for Cloud-Native Functions?▼

Source-based policy routing in eBPF is implemented using map-based routing tables and dynamic route updates to control packet forwarding paths for Cloud-Native Functions. This Skill provides the logic to define custom routing rules based on packet source attributes.

When do I need to use bpf_redirect_neigh for packet redirection?▼

You need bpf_redirect_neigh for packet redirection when forwarding packets to a directly connected neighbor, requiring MAC address resolution. It facilitates neighbor-aware redirection, which is essential for building custom routers and gateways that bypass the standard Linux routing stack.

Can I use eBPF to build a load balancer with dynamic route updates?▼

Yes, you can use eBPF to build a load balancer with dynamic route updates by implementing advanced packet redirection logic. This Skill includes patterns for load balancing and conditional routing, allowing fine-grained control over packet forwarding paths in custom network functions.

Does this eBPF packet redirection logic support IPv6 traffic?▼

Yes, this eBPF packet redirection logic supports IPv6 traffic alongside IPv4. It includes advanced patterns and helper functions to manage packet forwarding, policy chaining, and source-based routing across both IP protocols for Cloud-Native Functions.

What is the best way to update routing tables dynamically in an eBPF program?▼

The best way to update routing tables dynamically in an eBPF program is by using map-based routing tables. This approach allows you to dynamically alter packet forwarding paths and implement conditional routing without reloading the entire eBPF program.

Why use eBPF for packet forwarding instead of standard Linux routing?▼

Using eBPF for packet forwarding provides fine-grained, programmable control over routing logic, enabling source-based policies and load balancing that standard Linux routing cannot easily handle. It allows custom routers and service mesh sidecars to process packets directly in the kernel.