基於RYU restful api實現的VLAN網絡虛擬化

基於RYU restful api實現的VLAN網絡虛擬化

前言

本次實驗是基於OVS的VLAN虛擬化簡易實踐方案的進一步的實驗，採用RYU restful api進行配置。本質上和上次實驗沒什麼差，究其緣由仍是由於上次不能較好使用RYU的restful api，如今學會了就實踐一把吧。

RESTFUL API 下發流表

工具

• postman
• ryu/app/gui_topolog/gui_topology.py
• ovs
• mininet

實驗步驟

以前的實驗步驟不在贅述，主要是用RYU的restful api下發push_vlan

ACTION

tip:記得必定要大寫

Actions	Description	Example
OUTPUT	Output packet from "port"	{"type": "OUTPUT", "port": 3}
COPY_TTL_OUT	Copy TTL outwards	{"type": "COPY_TTL_OUT"}
COPY_TTL_IN	Copy TTL inwards	{"type": "COPY_TTL_IN"}
SET_MPLS_TTL	Set MPLS TTL using "mpls_ttl"	{"type": "SET_MPLS_TTL", "mpls_ttl": 64}
DEC_MPLS_TTL	Decrement MPLS TTL	{"type": "DEC_MPLS_TTL"}
PUSH_VLAN	Push a new VLAN tag with "ethertype"	{"type": "PUSH_VLAN", "ethertype": 33024}
POP_VLAN	Pop the outer VLAN tag	{"type": "POP_VLAN"}
PUSH_MPLS	Push a new MPLS tag with "ethertype"	{"type": "PUSH_MPLS", "ethertype": 34887}
POP_MPLS	Pop the outer MPLS tag with "ethertype"	{"type": "POP_MPLS", "ethertype": 2054}
SET_QUEUE	Set queue id using "queue_id" when outputting to a port	{"type": "SET_QUEUE", "queue_id": 7}
GROUP	Apply group identified by "group_id"	{"type": "GROUP", "group_id": 5}
SET_NW_TTL	Set IP TTL using "nw_ttl"	{"type": "SET_NW_TTL", "nw_ttl": 64}
DEC_NW_TTL	Decrement IP TTL	{"type": "DEC_NW_TTL"}
SET_FIELD	Set a "field" using "value"(The set of keywords available for "field" is the same as match field)	See Example of set-field action
PUSH_PBB	Push a new PBB service tag with "ethertype"(Openflow1.3+)	{"type": "PUSH_PBB", "ethertype": 35047}
POP_PBB	Pop the outer PBB service tag(Openflow1.3+)	{"type": "POP_PBB"}
COPY_FIELD	Copy value between header and register(Openflow1.5+)	{"type": "COPY_FIELD", "n_bits": 32, "src_offset": 1, "dst_offset": 2, "src_oxm_id": "eth_src", "dst_oxm_id": "eth_dst"}
METER	Apply meter identified by "meter_id"(Openflow1.5+)	{"type": "METER", "meter_id": 3}
EXPERIMENTER	Extensible action for the experimenter(Set "base64" or "ascii" to "data_type" field)	{"type": "EXPERIMENTER", "experimenter": 101, "data": "AAECAwQFBgc=", "data_type": "base64"}
GOTO_TABLE	(Instruction) Setup the next table identified by "table_id"	{"type": "GOTO_TABLE", "table_id": 8}
WRITE_METADATA	(Instruction) Setup the metadata field using "metadata" and "metadata_mask"	{"type": "WRITE_METADATA", "metadata": 0x3, "metadata_mask": 0x3}
METER	(Instruction) Apply meter identified by "meter_id"(deprecated in Openflow1.5)	{"type": "METER", "meter_id": 3}
WRITE_ACTIONS	(Instruction) Write the action(s) onto the datapath action set	{"type": "WRITE_ACTIONS", actions":[{"type":"POP_VLAN",},{ "type":"OUTPUT", "port": 2}]}
CLEAR_ACTIONS	(Instruction) Clears all actions from the datapath action set

Example of set-field action

$ curl -X POST -d '{
    "dpid": 1,
    "match":{
        "dl_type": "0x8000"
    },
    "actions":[
        {
            "type": "PUSH_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
            "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",     # Set VLAN ID
            "value": 4102            # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096)
        },
        {
            "type": "OUTPUT",
            "port": 2
        }
    ]
 }' http://localhost:8080/stats/flowentry/add

postman

ovs

sudo ovs-ofctl -O OpenFlow13 dump-flows s1

獲得結果

OFPST_FLOW reply (OF1.3) (xid=0x2):
 cookie=0x0, duration=2350.981s, table=0, n_packets=0, n_bytes=0, priority=1,in_port=1 actions=push_vlan:0x8100,set_field:4096->vlan_vid,output:2

總結

能夠基於此寫自動化腳本，不過仍是有經過restful api層面，感受還不是太好。下面搞一個不經過restful api層面的下發過程。

參考連接

RYU手冊中的restapi之match+action頁