Developing SDN apps in Ryu
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This document discusses developing SDN applications in Ryu. It provides an overview of OpenFlow, introduces Ryu application development, describes the OpenFlow API in Ryu, and demonstrates a hub application that floods ICMP packets and sends other protocols to the controller. The presenter is John-Lin from National Tsing Hua University researching network security in SDN using the Ryu controller.
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Developing SDN apps in Ryu
- 1. For SDNDS-TW Sharing Developing SDN apps in Ryu 林哲緯, John-Lin http://linton.tw/
- 2. whoami ❖ 林哲緯 ( John-Lin ) ❖ 清華⼤大學 通訊⼯工程所 HSNL LAB ❖ 背景是通訊⼯工程 • 原是寫 Python 當興趣，玩網路程式時接觸 SDN/OpenFlow ❖ ⽬目前研究使⽤用 Ryu 未來應該也會繼續⽤用 Ryu Controller ❖ Network Security in SDN • Contribute Snort-Integrate patch in Ryu • See more: http://linton.tw/2014/09/03/Ryu-with-Snort-Integration/
- 3. Outline ❖ OpenFlow Overview ❖ Introduction to Ryu application development ❖ The OpenFlow API in Ryu ❖ Demo
- 4. Outline ❖ OpenFlow Overview ❖ Introduction to Ryu application development ❖ The OpenFlow API in Ryu ❖ Demo
- 5. What is OpenFlow? Controller Plane OpenFlow Controller OpenFlow Protocol (SSL/TCP) Flow Table Packet Packet OpenFlow Switch Data Plane Forwarding Drop Forward to Controller
- 6. About Flow Entry Rule Action Statistics in_port VLAN ID VLAN pcp 1. Forward packet to ports 2. Forward to controller 3. Drop packet 4. Modify Field (set-field) MAC src MAC dst Eth type 1. Packet counter 2. Byte counter IP src IP dst IP ToS sport dport More match field: http://ryu.readthedocs.org/en/latest/ofproto_v1_3_ref.html?highlight=match#ryu.ofproto.ofproto_v1_3_parser.OFPMatch
- 7. Flow Table Table id 0 Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics
- 8. Multiple Flow Tables Table id 0 Table id 1 Table id 2 Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics Rule Action Statistics SDN Controller OpenFlow-enabled Network Device OpenFlow Protocol
- 9. OpenFlow Controller and switch workflow HANDSHAKE_DISPATCHER CONFIG_DISPATCHER MAIN_DISPATCHER DEAD_DISPATCHER 如果發⽣生連線中斷 Ryu Controller 的4種狀態
- 10. The messages between Controller and switch ❖ Controller-to-Switch Messages (Controller->Switch) ❖ Features ❖ Modify-State ❖ Packet-out ❖ Configuration, Read-State, Barrier, Role-Request, Asynchronous-Configuration ❖ Asynchronous Messages (Switch->Controller) ❖ Packet-In ❖ Flow Removed ❖ Port Status ❖ Error ❖ Symmetric Messages (Switch<->Controller) ❖ Hello ❖ Echo Request / Reply ❖ Experimenter OpenFlow Controller OpenFlow Protocol Flow Table OpenFlow Switch
- 11. Outline ❖ OpenFlow Overview ❖ Introduction to Ryu application development ❖ The OpenFlow API in Ryu ❖ Demo
- 12. What is Ryu ❖ Ryu is a component-based software defined networking framework. ❖ Fully written in Python ❖ Ryu supports various protocols for managing network devices • OpenFlow 1.0, 1.2, 1.3, 1.4, Netconf, OF-config ❖ License: Apache 2.0
- 13. Ryu Resources ❖ Official site: • http://osrg.github.io/ryu/ ❖ Mailing list: • https://lists.sourceforge.net/lists/listinfo/ryu-devel ❖ API Documentation: • http://ryu.readthedocs.org/en/latest/ ❖ RyuBook Tutorial (Chinese): • http://osrg.github.io/ryu-book/zh_tw/html/
- 14. Installation
- 15. Installation ❖ On Official site… ❖ Notice: Before you Install, check the dependencies first.
- 16. Automatic Installation Script ❖ On Ubuntu 12.04+, two-line command can install Ryu 3.14 ❖ This helper script which should get all dependencies and download, build, and install Ryu. Fork me on: https://github.com/John-Lin/ryuInstallHelper
- 17. To install dependencies in Ubuntu
- 18. How to use ❖ Run your application ❖ Run your application with debug output
- 19. Application programming model 1. ⼀一個 OpenFlow message 可以視為⼀一個 event 2. 利⽤用 decorators 來接 event 3. 定義事件處理器(Event Handler) Custom library 事件 Come from OpenFlow switches: • Asynchronous messages • Switch reply messages
- 20. Outline ❖ OpenFlow Overview ❖ Introduction to Ryu application development ❖ The OpenFlow API in Ryu ❖ Demo
- 21. OpenFlow protocol API Type Message Name Ryu OpenFlow API Controller to Switch Messages Features OFPFeaturesRequest / OFPSwitchFeatures Configuration OFPSetConfig Modify-State OFPFlowMod Read-State OFPFlowStatsRequest / OFPFlowStatsReply OFPPortStatsRequest / OFPPortStatsReply Packet-out OFPPacketOut Barrier OFPBarrierRequest / OFPBarrierReply Role-Request OFPRoleRequest / OFPRoleReply Asynchronous-Configuration OFPSetAsync / OFPGetAsyncReply Asynchronous Messages Packet-In OFPPacketIn Flow Removed OFPFlowRemoved Port Status OFPPortStatus Error OFPErrorMsg Symmetric Messages Hello OFPHello Echo Request / Reply OFPEchoRequest / OFPEchoReply Experimenter OFPExperimenter
- 22. OpenFlow Controller and switch workflow
- 23. Code Template in Ryu ❖ Usually in the Class ❖ Inheritance ❖ Decorators: @ ❖ 接取 OpenFlow message event ❖ Event Handler ❖ 接到event 後要 做的事定義在 method裡 Initial method Utility Methods Snort Library Plugin Controller to Switch Messages Asynchronous Messages
- 24. Outline ❖ OpenFlow Overview ❖ Introduction to Ryu application development ❖ The OpenFlow API in Ryu ❖ Demo
- 25. DEMO SDN Controller ❖ Hub application Flow table 1 2 3 4 priority=10, match=icmp, action=ALL priority=0, actions=CONTROLLER:65535 Host A Host B ❖ 利⽤用 Flow Table match ICMP 封包將其 Flood，其他協定 封包導到Controller 做處理 ❖ https://github.com/John-Lin/SDNDS-TW