func (b *DemoInstance) PacketIn(dpid net.HardwareAddr, pkt *ofp10.PacketIn) {
eth := pkt.Data
// Ignore link discovery packet types.
if eth.Ethertype == 0xa0f1 || eth.Ethertype == 0x88cc {
return
}
b.SetHost(eth.HWSrc, pkt.InPort)
if host, ok := b.Host(eth.HWDst); ok {
f1 := ofp10.NewFlowMod()
f1.Match.DLSrc = eth.HWSrc
f1.Match.DLDst = eth.HWDst
f1.AddAction(ofp10.NewActionOutput(host.port))
f1.IdleTimeout = 3
f2 := ofp10.NewFlowMod()
f2.Match.DLSrc = eth.HWDst
f2.Match.DLDst = eth.HWSrc
f2.AddAction(ofp10.NewActionOutput(pkt.InPort))
f2.IdleTimeout = 3
if s, ok := ogo.Switch(dpid); ok {
s.Send(f1)
s.Send(f2)
}
} else {
p := ofp10.NewPacketOut()
p.InPort = pkt.InPort
p.AddAction(ofp10.NewActionOutput(ofp10.P_ALL))
p.Data = ð
if sw, ok := ogo.Switch(dpid); ok {
sw.Send(p)
}
}
}
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 (o *OgoInstance) linkDiscoveryLoop(dpid net.HardwareAddr) {
for {
select {
case <-o.shutdown:
return
// Every two seconds send a link discovery packet.
case <-time.After(time.Second * 2):
e := eth.New()
e.Ethertype = 0xa0f1
e.HWSrc = dpid[2:]
linkDsc := NewLinkDiscovery()
linkDsc.SrcDPID = dpid
e.Data = linkDsc
pkt := ofp10.NewPacketOut()
pkt.Data = e
pkt.AddAction(ofp10.NewActionOutput(ofp10.P_ALL))
if sw, ok := Switch(dpid); ok {
sw.Send(pkt)
}
}
}
}