func (b *DemoApplication) parsePacketIn(dpid string, pkt *ofp10.OfpPacketIn) {
eth := pkt.Data
hwSrc := eth.HWSrc.String()
hwDst := eth.HWDst.String()
if _, ok := b.hostMap[hwSrc]; !ok {
b.hostMap[hwSrc] = pkt.InPort
}
if _, ok := b.hostMap[hwDst]; ok {
f1 := ofp10.NewFlowMod()
act1 := ofp10.NewActionOutput()
act1.Port = b.hostMap[hwDst]
f1.Actions = append(f1.Actions, act1)
m1 := ofp10.NewMatch()
m1.DLSrc = eth.HWSrc
m1.DLDst = eth.HWDst
f1.Match = *m1
f1.IdleTimeout = 3
f2 := ofp10.NewFlowMod()
act2 := ofp10.NewActionOutput()
act2.Port = b.hostMap[hwSrc]
f2.Actions = append(f1.Actions, act2)
m2 := ofp10.NewMatch()
m2.DLSrc = eth.HWDst
m2.DLDst = eth.HWSrc
f2.Match = *m2
f2.IdleTimeout = 3
if s, ok := ogo.GetSwitch(dpid); ok {
s.Send(f1)
s.Send(f2)
}
} else {
// Flood
pktOut := ofp10.NewPacketOut()
pktOut.Actions = append(pktOut.Actions, ofp10.NewActionOutput())
pktOut.Data = &pkt.Data
if s, ok := ogo.GetSwitch(dpid); ok {
s.Send(pktOut)
}
}
}
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 (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 {
fmt.Println(eth.HWSrc, ":", pkt.InPort, "to", eth.HWDst, ":", host.port)
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 := core.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 := core.Switch(dpid); ok {
sw.Send(p)
}
}
}
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):
eth := pacit.NewEthernet()
eth.Ethertype = 0xa0f1
eth.HWSrc = dpid[2:]
eth.Data = NewLinkDiscovery(dpid)
pkt := ofp10.NewPacketOut()
pkt.Data = eth
pkt.AddAction(ofp10.NewActionOutput(ofp10.P_ALL))
if sw, ok := Switch(dpid); ok {
sw.Send(pkt)
}
}
}
}