tc

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

• A version of Go that is supported by upstream

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