// 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
}
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
}