func (r *flooder) flood(ingress *network.Port, packet []byte) error {
f := ingress.Device().Factory()
inPort := openflow.NewInPort()
inPort.SetValue(ingress.Number())
outPort := openflow.NewOutPort()
outPort.SetFlood()
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
out, err := f.NewPacketOut()
if err != nil {
return err
}
out.SetInPort(inPort)
out.SetAction(action)
out.SetData(packet)
return ingress.Device().SendMessage(out)
}
func sendLLDP(deviceID string, f openflow.Factory, w trans.Writer, p openflow.Port) error {
lldp, err := newLLDPEtherFrame(deviceID, p)
if err != nil {
return err
}
outPort := openflow.NewOutPort()
outPort.SetValue(p.Number())
// Packet out to the port
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
out, err := f.NewPacketOut()
if err != nil {
return err
}
// From controller
out.SetInPort(openflow.NewInPort())
out.SetAction(action)
out.SetData(lldp)
return w.Write(out)
}
func (r *Action) UnmarshalBinary(data []byte) error {
buf := data
for len(buf) >= 4 {
t := binary.BigEndian.Uint16(buf[0:2])
length := binary.BigEndian.Uint16(buf[2:4])
if len(buf) < int(length) {
return openflow.ErrInvalidPacketLength
}
switch t {
case OFPAT_OUTPUT:
if len(buf) < 8 {
return openflow.ErrInvalidPacketLength
}
outPort := openflow.NewOutPort()
outPort.SetValue(binary.BigEndian.Uint32(buf[4:8]))
r.SetOutPort(outPort)
if err := r.Error(); err != nil {
return err
}
case OFPAT_SET_FIELD:
if len(buf) < 8 {
return openflow.ErrInvalidPacketLength
}
header := binary.BigEndian.Uint32(buf[4:8])
class := header >> 16 & 0xFFFF
if class != 0x8000 {
return errors.New("unsupported TLV class")
}
field := header >> 9 & 0x7F
switch field {
case OFPXMT_OFB_ETH_DST:
if len(buf) < 14 {
return openflow.ErrInvalidPacketLength
}
r.SetDstMAC(buf[8:14])
if err := r.Error(); err != nil {
return err
}
case OFPXMT_OFB_ETH_SRC:
if len(buf) < 14 {
return openflow.ErrInvalidPacketLength
}
r.SetSrcMAC(buf[8:14])
if err := r.Error(); err != nil {
return err
}
default:
// Do nothing
}
default:
// Do nothing
}
buf = buf[length:]
}
return nil
}
func (r *Device) SendARPAnnouncement(ip net.IP, mac net.HardwareAddr) error {
// Write lock
r.mutex.Lock()
defer r.mutex.Unlock()
if r.closed {
return ErrClosedDevice
}
announcement, err := makeARPAnnouncement(ip, mac)
if err != nil {
return err
}
inPort := openflow.NewInPort()
inPort.SetController()
action, err := r.factory.NewAction()
if err != nil {
return err
}
// Flood
action.SetOutPort(openflow.NewOutPort())
out, err := r.factory.NewPacketOut()
if err != nil {
return err
}
out.SetInPort(inPort)
out.SetAction(action)
out.SetData(announcement)
return r.session.Write(out)
}
func (r *Device) RemoveAllFlows() error {
// Write lock
r.mutex.Lock()
defer r.mutex.Unlock()
if r.closed {
return ErrClosedDevice
}
// Wildcard match
match, err := r.factory.NewMatch()
if err != nil {
return err
}
// Set output port to OFPP_NONE
port := openflow.NewOutPort()
port.SetNone()
flowmod, err := r.factory.NewFlowMod(openflow.FlowDelete)
if err != nil {
return err
}
// Remove flows except the table miss flows (Note that MSB of the cookie is a marker)
flowmod.SetCookieMask(0x1 << 63)
flowmod.SetTableID(0xFF) // ALL
flowmod.SetFlowMatch(match)
flowmod.SetOutPort(port)
if err := r.session.Write(flowmod); err != nil {
return err
}
return setARPSender(r.factory, r.session.trans)
}
func (r *BaseProcessor) PacketOut(egress *network.Port, packet []byte) error {
f := egress.Device().Factory()
inPort := openflow.NewInPort()
inPort.SetController()
outPort := openflow.NewOutPort()
outPort.SetValue(egress.Number())
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
out, err := f.NewPacketOut()
if err != nil {
return err
}
out.SetInPort(inPort)
out.SetAction(action)
out.SetData(packet)
return egress.Device().SendMessage(out)
}
func (r *L2Switch) installFlow(p flowParam) error {
// Skip the installation if p is already installed
if r.cache.exist(p) {
r.log.Debug(fmt.Sprintf("L2Switch: skipping duplicated flow installation: deviceID=%v, dstMAC=%v, outPort=%v", p.device.ID(), p.dstMAC, p.outPort))
return nil
}
f := p.device.Factory()
match, err := f.NewMatch()
if err != nil {
return err
}
match.SetVLANID(r.vlanID)
match.SetDstMAC(p.dstMAC)
outPort := openflow.NewOutPort()
outPort.SetValue(p.outPort)
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
inst, err := f.NewInstruction()
if err != nil {
return err
}
inst.ApplyAction(action)
flow, err := f.NewFlowMod(openflow.FlowAdd)
if err != nil {
return err
}
flow.SetTableID(p.device.FlowTableID())
flow.SetIdleTimeout(30)
flow.SetPriority(10)
flow.SetFlowMatch(match)
flow.SetFlowInstruction(inst)
if err := p.device.SendMessage(flow); err != nil {
return err
}
barrier, err := f.NewBarrierRequest()
if err != nil {
return err
}
if err := p.device.SendMessage(barrier); err != nil {
return err
}
r.cache.add(p)
r.log.Debug(fmt.Sprintf("L2Switch: added a flow cache entry: deviceID=%v, dstMAC=%v, outPort=%v", p.device.ID(), p.dstMAC, p.outPort))
return nil
}
func NewFlowMod(xid uint32, cmd uint16) openflow.FlowMod {
// Default out_port value is OFPP_NONE (OFPP_ANY)
outPort := openflow.NewOutPort()
outPort.SetNone()
return &FlowMod{
Message: openflow.NewMessage(openflow.OF10_VERSION, OFPT_FLOW_MOD, xid),
command: cmd,
outPort: outPort,
}
}
func sendQueueConfigRequest(f openflow.Factory, w trans.Writer, port uint32) error {
msg, err := f.NewQueueGetConfigRequest()
if err != nil {
return err
}
p := openflow.NewOutPort()
p.SetValue(port)
msg.SetPort(p)
return w.Write(msg)
}
func (r *Controller) removeFlows(mac net.HardwareAddr) {
for _, sw := range r.topo.Devices() {
f := sw.Factory()
match, err := f.NewMatch()
if err != nil {
r.log.Err(fmt.Sprintf("Controller: REST: failed to create an OpenFlow match: %v", err))
continue
}
match.SetDstMAC(mac)
outPort := openflow.NewOutPort()
outPort.SetNone()
r.log.Debug(fmt.Sprintf("Controller: REST: removing flows whose destinatcion MAC address is %v on %v", mac, sw.ID()))
if err := sw.RemoveFlow(match, outPort); err != nil {
r.log.Err(fmt.Sprintf("Controller: REST: failed to remove a flow from %v: %v", sw.ID(), err))
continue
}
}
}
func (r *L2Switch) OnPortDown(finder network.Finder, port *network.Port) error {
r.log.Debug(fmt.Sprintf("L2Switch: port down! removing all flows heading to that port (%v)..", port.ID()))
device := port.Device()
factory := device.Factory()
// Wildcard match
match, err := factory.NewMatch()
if err != nil {
return err
}
outPort := openflow.NewOutPort()
outPort.SetValue(port.Number())
if err := device.RemoveFlow(match, outPort); err != nil {
return fmt.Errorf("removing flows heading to port %v: %v", port.ID(), err)
}
return r.BaseProcessor.OnPortDown(finder, port)
}
func setARPSender(f openflow.Factory, w trans.Writer) error {
match, err := f.NewMatch()
if err != nil {
return err
}
match.SetEtherType(0x0806) // ARP
outPort := openflow.NewOutPort()
outPort.SetController()
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
inst, err := f.NewInstruction()
if err != nil {
return err
}
inst.ApplyAction(action)
flow, err := f.NewFlowMod(openflow.FlowAdd)
if err != nil {
return err
}
// Permanent flow
flow.SetIdleTimeout(0)
flow.SetHardTimeout(0)
flow.SetPriority(100)
flow.SetFlowMatch(match)
flow.SetFlowInstruction(inst)
if err := w.Write(flow); err != nil {
return err
}
return sendBarrierRequest(f, w)
}
func (r *of13Session) setDefaultTableMiss(f openflow.Factory, w trans.Writer) error {
inst, err := f.NewInstruction()
if err != nil {
return err
}
// 0 -> Controller
outPort := openflow.NewOutPort()
outPort.SetController()
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
inst.ApplyAction(action)
if err := r.setTableMiss(f, w, 0, inst); err != nil {
return fmt.Errorf("failed to set table_miss flow entry: %v", err)
}
r.device.setFlowTableID(0)
return nil
}
func (r *of13Session) setHP2920TableMiss(f openflow.Factory, w trans.Writer) error {
// Table-100 is a hardware table, and Table-200 is a software table
// that has very low performance.
inst, err := f.NewInstruction()
if err != nil {
return err
}
// 0 -> 100
inst.GotoTable(100)
if err := r.setTableMiss(f, w, 0, inst); err != nil {
return fmt.Errorf("failed to set table_miss flow entry: %v", err)
}
// 100 -> 200
inst.GotoTable(200)
if err := r.setTableMiss(f, w, 100, inst); err != nil {
return fmt.Errorf("failed to set table_miss flow entry: %v", err)
}
// 200 -> Controller
outPort := openflow.NewOutPort()
outPort.SetController()
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
inst.ApplyAction(action)
if err := r.setTableMiss(f, w, 200, inst); err != nil {
return fmt.Errorf("failed to set table_miss flow entry: %v", err)
}
r.device.setFlowTableID(200)
return nil
}
func (r *Action) UnmarshalBinary(data []byte) error {
buf := data
for len(buf) >= 4 {
t := binary.BigEndian.Uint16(buf[0:2])
length := binary.BigEndian.Uint16(buf[2:4])
if len(buf) < int(length) {
return openflow.ErrInvalidPacketLength
}
switch t {
case OFPAT_OUTPUT:
if len(buf) < 8 {
return openflow.ErrInvalidPacketLength
}
outPort := openflow.NewOutPort()
outPort.SetValue(uint32(binary.BigEndian.Uint16(buf[4:6])))
r.SetOutPort(outPort)
if err := r.Error(); err != nil {
return err
}
case OFPAT_SET_DL_SRC:
if len(buf) < 16 {
return openflow.ErrInvalidPacketLength
}
r.SetSrcMAC(buf[4:10])
if err := r.Error(); err != nil {
return err
}
case OFPAT_SET_DL_DST:
if len(buf) < 16 {
return openflow.ErrInvalidPacketLength
}
r.SetDstMAC(buf[4:10])
if err := r.Error(); err != nil {
return err
}
case OFPAT_ENQUEUE:
if len(buf) < 16 {
return openflow.ErrInvalidPacketLength
}
outPort := openflow.NewOutPort()
outPort.SetValue(uint32(binary.BigEndian.Uint16(buf[4:6])))
r.SetOutPort(outPort)
r.SetQueue(binary.BigEndian.Uint32(buf[12:16]))
if err := r.Error(); err != nil {
return err
}
case OFPAT_SET_VLAN_VID:
if len(buf) < 8 {
return openflow.ErrInvalidPacketLength
}
r.SetVLANID(binary.BigEndian.Uint16(buf[4:6]))
if err := r.Error(); err != nil {
return err
}
default:
// Do nothing
}
buf = buf[length:]
}
return nil
}