gofc

What is this?

OpenFlow Controller written in golang. Now, only support OpenFlow 1.3.

How to use

To run OpenFlow Controller with gofc, you have to follow the steps outlined bellow.

• Implement Handler
• Regist and Run Controller

Implement Handler

First, Implement handler interface. For example, if you want to handle PacketIn message, you should implement HandlePacketIn like bellow.

import (
	"github.com/Kmotiko/gofc"
	"github.com/Kmotiko/gofc/ofprotocol/ofp13"
)

type SampleController struct {
	// add any paramter used in controller.
}

func (c *SampleController) HandlePacketIn(msg *ofp13.OfpPacketIn, dp *gofc.Datapath) {
	// create flow mod
	fm := ofp13.NewOfpFlowMod(
		0,
		0,
		0,
		ofp13.OFPFC_ADD,
		0,
		0,
		0,
		ofp13.OFP_NO_BUFFER,
		ofp13.OFPP_ANY,
		ofp13.OFPG_ANY,
		ofp13.OFPFF_SEND_FLOW_REM)

	// TODO: set match field and instructions.

	// send FlowMod message
	dp.Send(fm)
}

Defenition of gofc interfaces is written in ofp13_handler.go.

Regist and Run Controller

If you complete to implement of handlers, you can regist that to gofc and start it.

func main() {
	// regist app
	ofc := NewSampleController()
	gofc.GetAppManager().RegistApplication(ofc)

	// start Controller
	gofc.ServerLoop()
}

OpenFlow Messages Support Status

Messages

• Hello
• OfpErroMsg
• OfpExperimenterMsg
• EchoRequest
• EchoReply
• FeaturesRequest
• FeaturesReply
• GetConfigRequest
• GetConfigReply
• SetConfig
• PacketIn
• FlowRemoved
• PortStatus
• PacketOut
• FlowMod
• GroupMod
• PortMod
• TableMod
• MultipartRequest
• MultipartReply
• BarrierRequest
• BarrierReply
• QueueGetConfigRequest
• QueueGetConfigReply
• RoleRequest
• RoleReply
• GetAsyncRequest
• GetAsyncReply
• SetAsync
• MeterMod

Match Field

• In Port
• In Phy Port
• Metadata
• Eth Dst
• Eth Src
• Eth Type
• Vlan ID
• Vlan PCP
• IP Dscp
• IP ECN
• IP Proto
• IPv4 Src
• IPv4 Dst
• TCP Src
• TCP Dst
• UDP Src
• UDP Dst
• SCTP Src
• SCTP Dst
• ICMPv4 Type
• ICMPv4 Code
• Arp Op
• Arp SPA
• Arp TPA
• Arp SHA
• Arp THA
• IPv6 Src
• IPv6 Dst
• IPv6 FLabel
• IPv6 Type
• IPv6 Code
• IPv6 ND Target
• IPv6 ND SLL
• IPv6 ND TLL
• MPLS Label
• MPLS TC
• MPLS BOS
• PBB ISID
• TUNNEL ID
• IPv6 ExtraHeader

Instructions

• Go to table
• Write Metadata
• Action
• Meter

Actions

• Output
• Copy TTL OUT
• Copy TTL IN
• Set MPLS TTL
• Dec MPLS TTL
• PUSH VLAN
• PUSH MPLS
• PUSH PBB
• POP VLAN
• POP MPLS
• POP PBB
• Group
• Set NW TTL
• Dec NW TTL
• Set Field
• Experimenter Header

MeterBand

• MeterBandDrop
• MeterBandDscpRemark
• MeterBandExperimenter

Multipart Message

• DescStats
• FlowStats
• AggregateStats
• TableStats
• PortStats
• QueueStats
• GroupStats
• GroupDescStats
• GroupFeaturesStats
• MeterStats
• MeterConfigStats
• MeterFeaturesStats
• TableFeaturesStats
• PortDescStats
• ExperimenterStats

License

This software is distributed with MIT license.

Copyright (c) 2016 Kmotiko