https://github.com/florianl/tc-skeleton

Simple project to demonstrate the loading of eBPF programs via florianl/go-tc.
https://github.com/florianl/tc-skeleton

ebpf kernel linux network-programming

Last synced: about 2 months ago
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Simple project to demonstrate the loading of eBPF programs via florianl/go-tc.

• Host: GitHub
• URL: https://github.com/florianl/tc-skeleton
• Owner: florianl
• License: mit
• Created: 2020-12-07T20:12:52.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2024-04-06T07:29:19.000Z (9 months ago)
• Last Synced: 2024-06-20T08:09:13.880Z (6 months ago)
• Topics: ebpf, kernel, linux, network-programming
• Language: Go
• Homepage:
• Size: 19.5 KB
• Stars: 33
• Watchers: 5
• Forks: 6
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
tc-skeleton

===========

Simple project to demonstrate the loading of eBPF programs via [florianl/go-tc](https://github.com/florianl/go-tc).

```

  $ cd ebpf

  $ make clean

  $ make drop

  $ cd ..

  $ go run main.go

```

Overview

--------

After the eBPF code is loaded from `ebpf/drop` the eBPF program `ingress_drop` is loaded into the kernel. In a next step this PoC creates a dummy interface. So it does not alter existing configurations or network interfaces. Then a [qdisc and filter](https://man7.org/linux/man-pages/man8/tc.8.html) are attached via the [netlink interface](https://man7.org/linux/man-pages/man7/netlink.7.html) of the kernel to this dummy interface. The file descriptor of the eBPF program `ingress_drop` is passed as argument of the filter to the kernel. With attaching the filter to the interface the eBPF program `ingress_drop` will run on every packet on the interface.

Privileges

----------

This PoC uses the [`netlink`](https://man7.org/linux/man-pages/man7/netlink.7.html) and [`eBPF`](https://man7.org/linux/man-pages/man2/bpf.2.html) interface of the kernel and therefore it requires special privileges. You can provide this privileges by adjusting the `CAP_NET_ADMIN` capabilities.