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traffic control in pure go - it allows to read and alter queues, filters and classes

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florianl/go-tc

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tc PkgGoDev Go Report Card GitHub Actions Coverage Status

This is a work in progress version of tc. It provides a C-binding free API to the netlink based traffic control system of rtnetlink.

Example

package main

import (
	"fmt"
	"net"
	"os"

	"github.com/mdlayher/netlink"

	"github.com/florianl/go-tc"
)

func main() {
	// open a rtnetlink socket
	rtnl, err := tc.Open(&tc.Config{})
	if err != nil {
		fmt.Fprintf(os.Stderr, "could not open rtnetlink socket: %v\n", err)
		return
	}
	defer func() {
		if err := rtnl.Close(); err != nil {
			fmt.Fprintf(os.Stderr, "could not close rtnetlink socket: %v\n", err)
		}
	}()

	// For enhanced error messages from the kernel, it is recommended to set
	// option `NETLINK_EXT_ACK`, which is supported since 4.12 kernel.
	//
	// If not supported, `unix.ENOPROTOOPT` is returned.

	err = rtnl.SetOption(netlink.ExtendedAcknowledge, true)
	if err != nil {
		fmt.Fprintf(os.Stderr, "could not set option ExtendedAcknowledge: %v\n", err)
		return
	}

	// get all the qdiscs from all interfaces
	qdiscs, err := rtnl.Qdisc().Get()
	if err != nil {
		fmt.Fprintf(os.Stderr, "could not get qdiscs: %v\n", err)
		return
	}

	for _, qdisc := range qdiscs {
		iface, err := net.InterfaceByIndex(int(qdisc.Ifindex))
		if err != nil {
			fmt.Fprintf(os.Stderr, "could not get interface from id %d: %v", qdisc.Ifindex, err)
			return
		}
		fmt.Printf("%20s\t%s\n", iface.Name, qdisc.Kind)
	}
}

Requirements

Privileges

This package processes information directly from the kernel and therefore it requires special privileges. You can provide this privileges by adjusting the CAP_NET_ADMIN capabilities.

	setcap 'cap_net_admin=+ep' /your/executable