Exemplo n.º 1
0
// startIML starts the MAC listener.
func (b *Bridge) startIML() {
	// use openflow to redirect arp and icmp6 traffic to the local tap
	filters := []string{
		"dl_type=0x0806,actions=local,normal",
		"dl_type=0x86dd,nw_proto=58,icmp_type=135,actions=local,normal",
	}
	for _, filter := range filters {
		if err := addOpenflow(b.Name, filter); err != nil {
			log.Error("cannot start ip learner on bridge: %v", err)
			return
		}
	}

	iml, err := ipmac.NewLearner(b.Name)
	if err != nil {
		log.Error("cannot start ip learner on bridge: %v", err)
		return
	}

	b.iml = iml
}
Exemplo n.º 2
0
func (b *bridge) startIML() error {
	if b.iml != nil {
		return nil
	}

	// use openflow to redirect arp and icmp6 traffic to the local tap
	var sOut bytes.Buffer
	var sErr bytes.Buffer
	p := process("openflow")

	cmd := &exec.Cmd{
		Path: p,
		Args: []string{
			p,
			"add-flow",
			b.Name,
			"dl_type=0x0806,actions=local,normal",
		},
		Env:    nil,
		Dir:    "",
		Stdout: &sOut,
		Stderr: &sErr,
	}
	log.Debug("adding arp flow with cmd: %v", cmd)
	ovsLock.Lock()
	err := cmd.Run()
	ovsLock.Unlock()
	if err != nil {
		e := fmt.Errorf("openflow: %v: %v", err, sErr.String())
		return e
	}

	cmd = &exec.Cmd{
		Path: p,
		Args: []string{
			p,
			"add-flow",
			b.Name,
			"dl_type=0x86dd,nw_proto=58,icmp_type=135,actions=local,normal",
		},
		Env:    nil,
		Dir:    "",
		Stdout: &sOut,
		Stderr: &sErr,
	}
	log.Debug("adding icmp6 ND flow with cmd: %v", cmd)
	ovsLock.Lock()
	err = cmd.Run()
	ovsLock.Unlock()
	if err != nil {
		e := fmt.Errorf("openflow: %v: %v", err, sErr.String())
		return e
	}

	iml, err := ipmac.NewLearner(b.Name)
	if err != nil {
		return fmt.Errorf("cannot start ip learner on bridge: %v", err)
	}
	b.Lock.Lock()
	b.iml = iml
	b.Lock.Unlock()
	return nil
}