func (o *OgoInstance) ConnectionUp(dpid net.HardwareAddr) {
dropMod := ofp10.NewFlowMod()
dropMod.Priority = 1
arpFmod := ofp10.NewFlowMod()
arpFmod.Priority = 2
arpFmod.Match.DLType = 0x0806 // ARP Messages
arpFmod.AddAction(ofp10.NewActionOutput(ofp10.P_CONTROLLER))
dscFmod := ofp10.NewFlowMod()
dscFmod.Priority = 0xffff
dscFmod.Match.DLType = 0xa0f1 // Link Discovery Messages
dscFmod.AddAction(ofp10.NewActionOutput(ofp10.P_CONTROLLER))
if sw, ok := Switch(dpid); ok {
sw.Send(ofp10.NewFeaturesRequest())
sw.Send(dropMod)
sw.Send(arpFmod)
sw.Send(dscFmod)
sw.Send(ofp10.NewEchoRequest())
}
go o.linkDiscoveryLoop(dpid)
}
func (c *Controller) handleConnection(conn *net.TCPConn) {
stream := NewMessageStream(conn)
h, err := ofpxx.NewHello(1)
if err != nil {
return
}
stream.Outbound <- h
for {
select {
//case stream.Outbound <- ofp10.NewHello():
// Send hello message with latest protocol version.
case msg := <-stream.Inbound:
switch m := msg.(type) {
// A Hello message of the appropriate type
// completes version negotiation. If version
// types are incompatable, it is possible the
// connection may be servered without error.
case *ofpxx.Header:
if m.Version == ofp10.VERSION {
// Version negotiation is
// considered complete. Create
// new Switch and notifiy listening
// applications.
stream.Version = m.Version
stream.Outbound <- ofp10.NewFeaturesRequest()
} else {
// Connection should be severed if controller
// doesn't support switch version.
log.Println("Received unsupported ofp version", m.Version)
stream.Shutdown <- true
}
// After a vaild FeaturesReply has been received we
// have all the information we need. Create a new
// switch object and notify applications.
case *ofp10.SwitchFeatures:
NewSwitch(stream, *m)
for _, newInstance := range Applications {
if sw, ok := Switch(m.DPID); ok {
i := newInstance()
sw.AddInstance(i)
}
}
return
// An error message may indicate a version mismatch. We
// disconnect if an error occurs this early.
case *ofp10.ErrorMsg:
log.Println(m)
stream.Version = m.Header.Version
stream.Shutdown <- true
}
case err := <-stream.Error:
// The connection has been shutdown.
log.Println(err)
return
case <-time.After(time.Second * 3):
// This shouldn't happen. If it does, both the controller
// and switch are no longer communicating. The TCPConn is
// still established though.
log.Println("Connection timed out.")
return
}
}
}