openflow

package
v1.2.0 Latest Latest
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 Go to latest Published: Jul 15, 2021 License: Apache-2.0 Imports: 28 Imported by: 1

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Index

Constants

View Source 
const (
	// We use OpenFlow Meter for packet-in rate limiting on OVS side.
	// Meter Entry ID.
	PacketInMeterIDNP = 1
	PacketInMeterIDTF = 2
	// Meter Entry Rate. It is represented as number of events per second.
	// Packets which exceed the rate will be dropped.
	PacketInMeterRateNP = 100
	PacketInMeterRateTF = 100

	// PacketIn reasons
	PacketInReasonTF ofpPacketInReason = 1
	PacketInReasonNP ofpPacketInReason = 0
	// PacketInQueueSize defines the size of PacketInQueue.
	// When PacketInQueue reaches PacketInQueueSize, new packet-in will be dropped.
	PacketInQueueSize = 200
	// PacketInQueueRate defines the maximum frequency of getting items from PacketInQueue.
	// PacketInQueueRate is represented as number of events per second.
	PacketInQueueRate = 100
)
View Source 
const (
	// Flow table id index
	ClassifierTable binding.TableIDType = 0

	AntreaPolicyEgressRuleTable binding.TableIDType = 45
	DefaultTierEgressRuleTable  binding.TableIDType = 49
	EgressRuleTable             binding.TableIDType = 50
	EgressDefaultTable          binding.TableIDType = 60
	EgressMetricTable           binding.TableIDType = 61

	AntreaPolicyIngressRuleTable binding.TableIDType = 85
	DefaultTierIngressRuleTable  binding.TableIDType = 89
	IngressRuleTable             binding.TableIDType = 90
	IngressDefaultTable          binding.TableIDType = 100
	IngressMetricTable           binding.TableIDType = 101

	L2ForwardingOutTable binding.TableIDType = 110
)
View Source 
const (
	PortCacheReg regType = 1

	EgressReg    regType = 5
	IngressReg   regType = 6
	TraceflowReg regType = 9 // Use reg9[28..31] to store traceflow dataplaneTag.
	// CNPDenyConjIDReg reuses reg3 which will also be used for storing endpoint IP to store the rule ID. Since
	// the service selection will finish when a packet hitting NetworkPolicy related rules, there is no conflict.
	CNPDenyConjIDReg regType = 3

	CtZone   = 0xfff0
	CtZoneV6 = 0xffe6

	ServiceCTMark = 0x21

	// disposition is loaded in marksReg [21-22]
	DispositionMarkReg regType = 0
	// disposition marks the flow action
	DispositionAllow = 0b00
	DispositionDrop  = 0b01
	DispositionRej   = 0b10

	// custom reason is loaded in marksReg [24-26]
	// The custom reason mark is used to indicate the reason(s) for sending the packet
	// to the controller. Reasons can be or-ed to indicate that the packets was sent
	// for multiple reasons.
	// For example, a value of 0b11 (CustomReasonLogging | CustomReasonReject) means
	// that the packet is sent to the controller both for NetworkPolicy logging and
	// because of a Reject action.
	CustomReasonMarkReg regType = 0
	// CustomReasonLogging is used when send packet-in to controller indicating this
	// packet need logging.
	CustomReasonLogging = 0b01
	// CustomReasonReject is not only used when send packet-in to controller indicating
	// that this packet should be rejected, but also used in the case that when
	// controller send reject packet as packet-out, we want reject response to bypass
	// the connTrack to avoid unexpected drop.
	CustomReasonReject = 0b10
	// CustomReasonDeny is used when sending packet-in message to controller indicating
	// that the corresponding connection has been dropped or rejected. It can be consumed
	// by the Flow Exporter to export flow records for connections denied by network
	// policy rules.
	CustomReasonDeny = 0b100
)

Variables

View Source 
var (
	MatchDstIP         = types.NewMatchKey(binding.ProtocolIP, types.IPAddr, "nw_dst")
	MatchSrcIP         = types.NewMatchKey(binding.ProtocolIP, types.IPAddr, "nw_src")
	MatchDstIPNet      = types.NewMatchKey(binding.ProtocolIP, types.IPNetAddr, "nw_dst")
	MatchSrcIPNet      = types.NewMatchKey(binding.ProtocolIP, types.IPNetAddr, "nw_src")
	MatchDstIPv6       = types.NewMatchKey(binding.ProtocolIPv6, types.IPAddr, "ipv6_dst")
	MatchSrcIPv6       = types.NewMatchKey(binding.ProtocolIPv6, types.IPAddr, "ipv6_src")
	MatchDstIPNetv6    = types.NewMatchKey(binding.ProtocolIPv6, types.IPNetAddr, "ipv6_dst")
	MatchSrcIPNetv6    = types.NewMatchKey(binding.ProtocolIPv6, types.IPNetAddr, "ipv6_src")
	MatchDstOFPort     = types.NewMatchKey(binding.ProtocolIP, types.OFPortAddr, "reg1[0..31]")
	MatchSrcOFPort     = types.NewMatchKey(binding.ProtocolIP, types.OFPortAddr, "in_port")
	MatchTCPDstPort    = types.NewMatchKey(binding.ProtocolTCP, types.L4PortAddr, "tp_dst")
	MatchTCPv6DstPort  = types.NewMatchKey(binding.ProtocolTCPv6, types.L4PortAddr, "tp_dst")
	MatchUDPDstPort    = types.NewMatchKey(binding.ProtocolUDP, types.L4PortAddr, "tp_dst")
	MatchUDPv6DstPort  = types.NewMatchKey(binding.ProtocolUDPv6, types.L4PortAddr, "tp_dst")
	MatchSCTPDstPort   = types.NewMatchKey(binding.ProtocolSCTP, types.L4PortAddr, "tp_dst")
	MatchSCTPv6DstPort = types.NewMatchKey(binding.ProtocolSCTPv6, types.L4PortAddr, "tp_dst")
	Unsupported        = types.NewMatchKey(binding.ProtocolIP, types.UnSupported, "unknown")
)
View Source 
var (

	// APDispositionMarkRange takes the 21 to 22 bits of register marksReg to indicate
	// disposition of Antrea Policy. It could have more bits to support more disposition
	// that Antrea policy support in the future.
	APDispositionMarkRange = binding.Range{21, 22}
	// CustomReasonMarkRange takes the 24 to 26 bits of register marksReg to indicate
	// the reason of sending packet to the controller. It could have more bits to
	// support more customReason in the future.
	CustomReasonMarkRange = binding.Range{24, 26}
)
View Source 
var DispositionToString = map[uint32]string{
	DispositionAllow: "Allow",
	DispositionDrop:  "Drop",
	DispositionRej:   "Reject",
}
View Source 
var (
	FlowTables = []struct {
		Number binding.TableIDType
		Name   string
	}{
		{ClassifierTable, "Classification"},
		{uplinkTable, "Uplink"},
		{spoofGuardTable, "SpoofGuard"},
		{arpResponderTable, "ARPResponder"},
		{ipv6Table, "IPv6"},
		{serviceHairpinTable, "ServiceHairpin"},
		{conntrackTable, "ConntrackZone"},
		{conntrackStateTable, "ConntrackState"},
		{dnatTable, "DNAT(SessionAffinity)"},
		{sessionAffinityTable, "SessionAffinity"},
		{serviceLBTable, "ServiceLB"},
		{endpointDNATTable, "EndpointDNAT"},
		{AntreaPolicyEgressRuleTable, "AntreaPolicyEgressRule"},
		{EgressRuleTable, "EgressRule"},
		{EgressDefaultTable, "EgressDefaultRule"},
		{EgressMetricTable, "EgressMetric"},
		{l3ForwardingTable, "L3Forwarding"},
		{snatTable, "SNAT"},
		{l3DecTTLTable, "IPTTLDec"},
		{l2ForwardingCalcTable, "L2Forwarding"},
		{AntreaPolicyIngressRuleTable, "AntreaPolicyIngressRule"},
		{IngressRuleTable, "IngressRule"},
		{IngressDefaultTable, "IngressDefaultRule"},
		{IngressMetricTable, "IngressMetric"},
		{conntrackCommitTable, "ConntrackCommit"},
		{hairpinSNATTable, "HairpinSNATTable"},
		{L2ForwardingOutTable, "Output"},
	}
)

Functions

func GetAntreaPolicyBaselineTierTables 

func GetAntreaPolicyBaselineTierTables() []binding.TableIDType

func GetAntreaPolicyEgressTables 

func GetAntreaPolicyEgressTables() []binding.TableIDType

func GetAntreaPolicyIngressTables 

func GetAntreaPolicyIngressTables() []binding.TableIDType

func GetAntreaPolicyMultiTierTables 

func GetAntreaPolicyMultiTierTables() []binding.TableIDType

func GetFlowTableName 

func GetFlowTableName(tableNumber binding.TableIDType) string

GetFlowTableName returns the flow table name given the table number. An empty string is returned if the table cannot be found.

func GetFlowTableNumber 

func GetFlowTableNumber(tableName string) binding.TableIDType

GetFlowTableNumber does a case insensitive lookup of the table name, and returns the flow table number if the table is found. Otherwise TableIDAll is returned if the table cannot be found.

Types

type Client 

type Client interface {
	// Initialize sets up all basic flows on the specific OVS bridge. It returns a channel which
	// is used to notify the caller in case of a reconnection, in which case ReplayFlows should
	// be called to ensure that the set of OVS flows is correct. All flows programmed in the
	// switch which match the current round number will be deleted before any new flow is
	// installed.
	Initialize(roundInfo types.RoundInfo, config *config.NodeConfig, encapMode config.TrafficEncapModeType) (<-chan struct{}, error)

	// InstallGatewayFlows sets up flows related to an OVS gateway port, the gateway must exist.
	InstallGatewayFlows() error

	// InstallClusterServiceCIDRFlows sets up the appropriate flows so that traffic can reach
	// the different Services running in the Cluster. This method needs to be invoked once with
	// the Cluster Service CIDR as a parameter.
	InstallClusterServiceCIDRFlows(serviceNets []*net.IPNet) error

	// InstallClusterServiceFlows sets up the appropriate flows so that traffic can reach
	// the different Services running in the Cluster. This method needs to be invoked once.
	InstallClusterServiceFlows() error

	// InstallDefaultTunnelFlows sets up the classification flow for the default (flow based) tunnel.
	InstallDefaultTunnelFlows() error

	// InstallNodeFlows should be invoked when a connection to a remote Node is going to be set
	// up. The hostname is used to identify the added flows. When IPSec tunnel is enabled,
	// ipsecTunOFPort must be set to the OFPort number of the IPSec tunnel port to the remote Node;
	// otherwise ipsecTunOFPort must be set to 0.
	// InstallNodeFlows has all-or-nothing semantics(call succeeds if all the flows are installed
	// successfully, otherwise no flows will be installed). Calls to InstallNodeFlows are idempotent.
	// Concurrent calls to InstallNodeFlows and / or UninstallNodeFlows are supported as long as they
	// are all for different hostnames.
	InstallNodeFlows(
		hostname string,
		peerConfigs map[*net.IPNet]net.IP,
		tunnelPeerIP net.IP,
		ipsecTunOFPort uint32,
		peerNodeMAC net.HardwareAddr) error

	// UninstallNodeFlows removes the connection to the remote Node specified with the
	// hostname. UninstallNodeFlows will do nothing if no connection to the host was established.
	UninstallNodeFlows(hostname string) error

	// InstallPodFlows should be invoked when a connection to a Pod on current Node. The
	// interfaceName is used to identify the added flows. InstallPodFlows has all-or-nothing
	// semantics(call succeeds if all the flows are installed successfully, otherwise no
	// flows will be installed). Calls to InstallPodFlows are idempotent. Concurrent calls
	// to InstallPodFlows and / or UninstallPodFlows are supported as long as they are all
	// for different interfaceNames.
	InstallPodFlows(interfaceName string, podInterfaceIPs []net.IP, podInterfaceMAC net.HardwareAddr, ofPort uint32) error

	// UninstallPodFlows removes the connection to the local Pod specified with the
	// interfaceName. UninstallPodFlows will do nothing if no connection to the Pod was established.
	UninstallPodFlows(interfaceName string) error

	// InstallServiceGroup installs a group for Service LB. Each endpoint
	// is a bucket of the group. For now, each bucket has the same weight.
	InstallServiceGroup(groupID binding.GroupIDType, withSessionAffinity bool, endpoints []proxy.Endpoint) error
	// UninstallServiceGroup removes the group and its buckets that are
	// installed by InstallServiceGroup.
	UninstallServiceGroup(groupID binding.GroupIDType) error

	// InstallEndpointFlows installs flows for accessing Endpoints.
	// If an Endpoint is on the current Node, then flows for hairpin and endpoint
	// L2 forwarding should also be installed.
	InstallEndpointFlows(protocol binding.Protocol, endpoints []proxy.Endpoint) error
	// UninstallEndpointFlows removes flows of the Endpoint installed by
	// InstallEndpointFlows.
	UninstallEndpointFlows(protocol binding.Protocol, endpoint proxy.Endpoint) error

	// InstallServiceFlows installs flows for accessing Service with clusterIP.
	// It installs the flow that uses the group/bucket to do service LB. If the
	// affinityTimeout is not zero, it also installs the flow which has a learn
	// action to maintain the LB decision.
	// The group with the groupID must be installed before, otherwise the
	// installation will fail.
	InstallServiceFlows(groupID binding.GroupIDType, svcIP net.IP, svcPort uint16, protocol binding.Protocol, affinityTimeout uint16) error
	// UninstallServiceFlows removes flows installed by InstallServiceFlows.
	UninstallServiceFlows(svcIP net.IP, svcPort uint16, protocol binding.Protocol) error
	// InstallLoadBalancerServiceFromOutsideFlows installs flows for LoadBalancer Service traffic from outside node.
	// The traffic is received from uplink port and will be forwarded to gateway by the installed flows. And then
	// kube-proxy will handle the traffic.
	// This function is only used for Windows platform.
	InstallLoadBalancerServiceFromOutsideFlows(svcIP net.IP, svcPort uint16, protocol binding.Protocol) error
	// UninstallLoadBalancerServiceFromOutsideFlows removes flows installed by InstallLoadBalancerServiceFromOutsideFlows.
	UninstallLoadBalancerServiceFromOutsideFlows(svcIP net.IP, svcPort uint16, protocol binding.Protocol) error

	// GetFlowTableStatus should return an array of flow table status, all existing flow tables should be included in the list.
	GetFlowTableStatus() []binding.TableStatus

	// InstallPolicyRuleFlows installs flows for a new NetworkPolicy rule. Rule should include all fields in the
	// NetworkPolicy rule. Each ingress/egress policy rule installs Openflow entries on two tables, one for
	// ruleTable and the other for dropTable. If a packet does not pass the ruleTable, it will be dropped by the
	// dropTable.
	InstallPolicyRuleFlows(ofPolicyRule *types.PolicyRule) error

	// BatchInstallPolicyRuleFlows installs multiple flows for NetworkPolicy rules in batch.
	BatchInstallPolicyRuleFlows(ofPolicyRules []*types.PolicyRule) error

	// UninstallPolicyRuleFlows removes the Openflow entry relevant to the specified NetworkPolicy rule.
	// It also returns a slice of stale ofPriorities used by ClusterNetworkPolicies.
	// UninstallPolicyRuleFlows will do nothing if no Openflow entry for the rule is installed.
	UninstallPolicyRuleFlows(ruleID uint32) ([]string, error)

	// AddPolicyRuleAddress adds one or multiple addresses to the specified NetworkPolicy rule. If addrType is true, the
	// addresses are added to PolicyRule.From, else to PolicyRule.To.
	AddPolicyRuleAddress(ruleID uint32, addrType types.AddressType, addresses []types.Address, priority *uint16) error

	// DeletePolicyRuleAddress removes addresses from the specified NetworkPolicy rule. If addrType is srcAddress, the addresses
	// are removed from PolicyRule.From, else from PolicyRule.To.
	DeletePolicyRuleAddress(ruleID uint32, addrType types.AddressType, addresses []types.Address, priority *uint16) error

	// InstallBridgeUplinkFlows installs Openflow flows between bridge local port and uplink port to support
	// host networking.
	// This function is only used for Windows platform.
	InstallBridgeUplinkFlows() error

	// InstallExternalFlows sets up flows to enable Pods to communicate to
	// the external IP addresses. The flows identify the packets from local
	// Pods to the external IP address, and mark the packets to be SNAT'd
	// with the configured SNAT IPs. On Windows Node, the flows also perform
	// SNAT with the Openflow NAT action.
	InstallExternalFlows() error

	// InstallSNATMarkFlows installs flows for a local SNAT IP. On Linux, a
	// single flow is added to mark the packets tunnelled from remote Nodes
	// that should be SNAT'd with the SNAT IP. On Windows, an extra flow is
	// added to perform SNAT for the marked packets with the SNAT IP.
	InstallSNATMarkFlows(snatIP net.IP, mark uint32) error

	// UninstallSNATMarkFlows removes the flows installed to set the packet
	// mark for a SNAT IP.
	UninstallSNATMarkFlows(mark uint32) error

	// InstallPodSNATFlows installs the SNAT flows for a local Pod. If the
	// SNAT IP for the Pod is on the local Node, a non-zero SNAT ID should
	// allocated for the SNAT IP, and the installed flow sets the SNAT IP
	// mark on the egress packets from the ofPort; if the SNAT IP is on a
	// remote Node, snatMark should be set to 0, and the installed flow
	// tunnels egress packets to the remote Node using the SNAT IP as the
	// tunnel destination, and the packets should be SNAT'd on the remote
	// Node. As of now, a Pod can be configured to use only a single SNAT
	// IP in a single address family (IPv4 or IPv6).
	InstallPodSNATFlows(ofPort uint32, snatIP net.IP, snatMark uint32) error

	// UninstallPodSNATFlows removes the SNAT flows for the local Pod.
	UninstallPodSNATFlows(ofPort uint32) error

	// Disconnect disconnects the connection between client and OFSwitch.
	Disconnect() error

	// IsConnected returns the connection status between client and OFSwitch. The return value is true if the OFSwitch is connected.
	IsConnected() bool

	// ReplayFlows should be called when a spurious disconnection occurs. After we reconnect to
	// the OFSwitch, we need to replay all the flows cached by the client. ReplayFlows will try
	// to replay as many flows as possible, and will log an error when a flow cannot be
	// installed.
	ReplayFlows()

	// DeleteStaleFlows deletes all flows from the previous round which are no longer needed. It
	// should be called by the agent after all required flows have been installed / updated with
	// the new round number.
	DeleteStaleFlows() error

	// GetTunnelVirtualMAC() returns globalVirtualMAC used for tunnel traffic.
	GetTunnelVirtualMAC() net.HardwareAddr

	// GetPodFlowKeys returns the keys (match strings) of the cached flows for a
	// Pod.
	GetPodFlowKeys(interfaceName string) []string

	// GetServiceFlowKeys returns the keys (match strings) of the cached
	// flows for a Service (port) and its endpoints.
	GetServiceFlowKeys(svcIP net.IP, svcPort uint16, protocol binding.Protocol, endpoints []proxy.Endpoint) []string

	// GetNetworkPolicyFlowKeys returns the keys (match strings) of the cached
	// flows for a NetworkPolicy. Flows are grouped by policy rules, and duplicated
	// entries can be added due to conjunctive match flows shared by multiple
	// rules.
	GetNetworkPolicyFlowKeys(npName, npNamespace string) []string

	// ReassignFlowPriorities takes a list of priority updates, and update the actionFlows to replace
	// the old priority with the desired one, for each priority update on that table.
	ReassignFlowPriorities(updates map[uint16]uint16, table binding.TableIDType) error

	// SubscribePacketIn subscribes to packet in messages for the given reason. Packets
	// will be placed in the queue and if the queue is full, the packet in messages
	// will be dropped. pktInQueue supports rate-limiting for the consumer, in order to
	// constrain the compute resources that may be used by the consumer.
	SubscribePacketIn(reason uint8, pktInQueue *binding.PacketInQueue) error

	// SendTraceflowPacket injects packet to specified OVS port for Openflow.
	SendTraceflowPacket(dataplaneTag uint8, packet *binding.Packet, inPort uint32, outPort int32) error

	// InstallTraceflowFlows installs flows for a Traceflow request.
	InstallTraceflowFlows(dataplaneTag uint8, liveTraffic, droppedOnly, receiverOnly bool, packet *binding.Packet, ofPort uint32, timeoutSeconds uint16) error

	// UninstallTraceflowFlows uninstalls flows for a Traceflow request.
	UninstallTraceflowFlows(dataplaneTag uint8) error

	// Initial tun_metadata0 in TLV map for Traceflow.
	InitialTLVMap() error

	// Find Network Policy reference and OFpriority by conjunction ID.
	GetPolicyInfoFromConjunction(ruleID uint32) (string, string)

	// RegisterPacketInHandler uses SubscribePacketIn to get PacketIn message and process received
	// packets through registered handlers.
	RegisterPacketInHandler(packetHandlerReason uint8, packetHandlerName string, packetInHandler interface{})

	StartPacketInHandler(packetInStartedReason []uint8, stopCh <-chan struct{})
	// Get traffic metrics of each NetworkPolicy rule.
	NetworkPolicyMetrics() map[uint32]*types.RuleMetric
	// Returns if IPv4 is supported on this Node or not.
	IsIPv4Enabled() bool
	// Returns if IPv6 is supported on this Node or not.
	IsIPv6Enabled() bool
	// SendTCPPacketOut sends TCP packet as a packet-out to OVS.
	SendTCPPacketOut(
		srcMAC string,
		dstMAC string,
		srcIP string,
		dstIP string,
		inPort uint32,
		outPort int32,
		isIPv6 bool,
		tcpSrcPort uint16,
		tcpDstPort uint16,
		tcpAckNum uint32,
		tcpFlag uint8,
		isReject bool) error
	// SendICMPPacketOut sends ICMP packet as a packet-out to OVS.
	SendICMPPacketOut(
		srcMAC string,
		dstMAC string,
		srcIP string,
		dstIP string,
		inPort uint32,
		outPort int32,
		isIPv6 bool,
		icmpType uint8,
		icmpCode uint8,
		icmpData []byte,
		isReject bool) error
}

Client is the interface to program OVS flows for entity connectivity of Antrea.

func NewClient 

func NewClient(bridgeName, mgmtAddr string, ovsDatapathType ovsconfig.OVSDatapathType, enableProxy, enableAntreaPolicy, enableEgress bool, enableDenyTracking bool) Client

NewClient is the constructor of the Client interface.

type ConjunctionNotFound 

type ConjunctionNotFound uint32

ConjunctionNotFound is an error response when the specified policyRuleConjunction is not found from the local cache.

func (*ConjunctionNotFound) Error 

func (e *ConjunctionNotFound) Error() string

type IPAddress 

type IPAddress net.IP

IP address calculated from Pod's address.

func NewIPAddress 

func NewIPAddress(addr net.IP) *IPAddress

func (*IPAddress) GetMatchKey 

func (a *IPAddress) GetMatchKey(addrType types.AddressType) *types.MatchKey

func (*IPAddress) GetMatchValue 

func (a *IPAddress) GetMatchValue() string

func (*IPAddress) GetValue 

func (a *IPAddress) GetValue() interface{}

type IPNetAddress 

type IPNetAddress net.IPNet

IP block calculated from Pod's address.

func NewIPNetAddress 

func NewIPNetAddress(addr net.IPNet) *IPNetAddress

func (*IPNetAddress) GetMatchKey 

func (a *IPNetAddress) GetMatchKey(addrType types.AddressType) *types.MatchKey

func (*IPNetAddress) GetMatchValue 

func (a *IPNetAddress) GetMatchValue() string

func (*IPNetAddress) GetValue 

func (a *IPNetAddress) GetValue() interface{}

type OFEntryOperations 

type OFEntryOperations interface {
	Add(flow binding.Flow) error
	Modify(flow binding.Flow) error
	Delete(flow binding.Flow) error
	AddAll(flows []binding.Flow) error
	ModifyAll(flows []binding.Flow) error
	BundleOps(adds []binding.Flow, mods []binding.Flow, dels []binding.Flow) error
	DeleteAll(flows []binding.Flow) error
	AddOFEntries(ofEntries []binding.OFEntry) error
	DeleteOFEntries(ofEntries []binding.OFEntry) error
}

type OFPortAddress 

type OFPortAddress int32

OFPortAddress is the Openflow port of an interface.

func NewOFPortAddress 

func NewOFPortAddress(addr int32) *OFPortAddress

func (*OFPortAddress) GetMatchKey 

func (a *OFPortAddress) GetMatchKey(addrType types.AddressType) *types.MatchKey

func (*OFPortAddress) GetMatchValue 

func (a *OFPortAddress) GetMatchValue() string

func (*OFPortAddress) GetValue 

func (a *OFPortAddress) GetValue() interface{}

type PacketInHandler 

type PacketInHandler interface {
	HandlePacketIn(pktIn *ofctrl.PacketIn) error
}

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