traffic control in pure go - it allows to read and alter queues, filters and classes
MIT License
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.
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)
}
}
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