林廣哲
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    --- tags: SDN, P4, mininet --- # P4筆記 參考: https://csie1.nqu.edu.tw/smallko/sdn/sdn.htm ## [1](https://youtu.be/euDS8MHaW3I) ![](https://hackmd.io/_uploads/BJTEz9JTh.png) Parsers : 分析標頭資訊 Controls : 控制data flow的行為(從哪個port出發) Expressions : 支援`+ - *`不支援`/` Data Types : Bistrings, headers, structures, arrays 編譯: `p4c --target bmv2 --arch v1model --std p4-16 "basic.p4" -o.` bmv2 (behavioral model version 2) 輸出 basic.json --- 範例程式1: 12:35 ~ 19:10 ![](https://hackmd.io/_uploads/r1LYBcy62.png) 19:10 ~ 21:00 ![](https://hackmd.io/_uploads/rkyhBcy63.png) --- 簡化框架 ![](https://hackmd.io/_uploads/SyBz8ckpn.png) 22:25 ~ 25:12 在開發專案之前 複製並修改p4app.json的topology部分 (通常只會修改紅色部分) cmd.txt: s1預先設定的規則 basic.p4: 要執行的p4程式 ![](https://hackmd.io/_uploads/SkrIL5Jan.png) --- 測試: 25:13 ~ 31:55 `p4run` 動態 調整 規則 從執行`p4run`的終端機(a)中 可以看到thrift-port 9090 (s1 透過9090 port 進行通訊) (a): h1 ping h2 -c 3 會通 再從另一個終端機(b) 執行 simple_switch_CLI --thrift-port 9090 (b): `help` 查看cmd `help table_down` 查看table_down指令 table_down mac_forward(這個表格名稱是自己取的) 可以看到cmd.txt對應的規則 table_clear mac_forward: 清除表格內容 table_down mac_forward 會發現 規則不見了 (a): h1 ping h2 -c 3 不會通 只要有封包傳送就會記錄到./pcap 30:30 ~ 31:48 log資料夾(debug) 解析 ## [2](https://youtu.be/QbTboYkIBjE) p4app.json 的 cli_input(下圖)若沒設定 會導致ping 失敗 ![](https://hackmd.io/_uploads/ryLd05J6h.png) 0:00 ~ 5:00 這時 也可以在runtime透過table_add設定規則(下圖) ![](https://hackmd.io/_uploads/Sk1ZJoyah.png) 加入的規則: ![](https://hackmd.io/_uploads/H1_myjJph.png) --- priority的設定 05:00 ~ 05:35 log解析 ping(**重要**) 06:38 ~ 13:55 --- ## [3](https://youtu.be/rOODoTlnKtI) 在runtime時 動態替換P4程式 ![](https://hackmd.io/_uploads/HJgQXj1pn.png) [參考](https://nqucsie.myqnapcloud.com/smallko/sdn/swap_p4program.htm) p4-util 原生不支持 動態替換P4程式 > you need to modify the file p4_mininet.py, which is located p4-utils/p4utils/mininetlib. 具體內容請參考上方連結 程式碼講解 5:30 ~ 9:30 實驗 9:30 ~ load_new_config_file mac_forward.json(要替換的p4 file) swap_configs 可以用table_dump檢查是否生效,會發現 新的table是空的 所以要記得設定規則(table_add) 規則: ![](https://hackmd.io/_uploads/H1_myjJph.png) --- ## [4](https://youtu.be/zzSksWCpu5M) [p4-learning 專案](https://github.com/nsg-ethz/p4-learning) 範例1 [Repeater](https://github.com/nsg-ethz/p4-learning/tree/master/examples/repeater) 程式碼講解 02:00 ~ 07:35 執行範例 07:35 ~ 24:14 mx命令、腳本執行 --- ## [5](https://youtu.be/r4RzQY0_w2A) 第3層 轉發 ### example 1 (0:00~15:45) ![](https://hackmd.io/_uploads/r1A0nqxpn.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAClhIylmg7pyvI-ibUAwZU1a/p4/3?dl=0&subfolder_nav_tracking=1) code講解(包含.json中的topology設定) 03:30 ~ 12:57 拓樸中,若需要手動指定IP、default gateway要修改下圖圈選處 ![](https://hackmd.io/_uploads/SJGggsxa3.png) 執行 12:57 ~ 15:45 --- ### example 2 (15:45~34:45) [L3-routing (web)](https://nqucsie.myqnapcloud.com/smallko/sdn/p4utils-l3routing.htm)、 [L3-routing1 code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAAceJ72uyTU3PxR3clLCx_Sa/p4-utils-example/l3_routing1?dl=0&lst=)、 [L3-routing2 code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AABGzHYgxfD7jSuyEWm_b2uxa/p4-utils-example/l3_routing2?dl=0&lst=) ![](https://hackmd.io/_uploads/ByysZsg63.png) 路由轉發時,有兩種不同的策略: (1) 用 單一表格 進行轉發 (只根據IP addr) ![](https://hackmd.io/_uploads/ByucGolan.png) (2) 用 2個不同表格 進行轉發 (根據 處理方式編號) ![](https://hackmd.io/_uploads/S17sMjeT3.png) --- two-tables 的優缺點 22:00~25:24 ![](https://hackmd.io/_uploads/SJKIXie62.png) 當鏈路出現問題時 two-tables只要修改特定 處理方式 的內容,不需單獨修該所有設定(one-table需要) 實驗(包含程式碼講解、metadata使用32:23) 25:24~34:45 --- ## [6](https://youtu.be/R1r1Q4K1DVU) [Simple Controller to populate routing tables for any topology (web)](https://nqucsie.myqnapcloud.com/smallko/sdn/p4utils-controller1.htm)、 [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAC4jvqr9hNRI0fz5D4c5YZna/p4-utils-example/routing_controller1?dl=0&subfolder_nav_tracking=1) 使用controller生成、下放規則 程式碼講解 02:55~06:20 實驗 06:20~08:15 P4-controller撰寫 08:15(code 10:50)(執行 15:20) ~ 31:53 controller 透過 topology.db 取得全局拓樸資訊 topology.db 包含節點(s1 s2)相關資訊 IP設定 連接狀態 delay... --- ## [7](https://youtu.be/4cDuMp2m1Ak) 量測switch 或 host 間的 bandwidth utilization ![](https://hackmd.io/_uploads/BkFD7aep3.png) 元件 counter(11:00~18:20) 紀錄 每個port累計的封包數、byte數 以及 吞吐量計算 ![](https://hackmd.io/_uploads/BJY5Hpeph.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAAbkvWk1ncN-VTVC2nESmnva/p4-utils-example/monitor_linkbw?dl=0&subfolder_nav_tracking=1) 程式碼講解 02:30 ~ 10:30 (3:20~10:30)Q: P4程式完成後 如何在程式執行時再加上規則 --- ## [8](https://youtu.be/lRn9A-im0ws) Monitor Queue Length (交換機中的queue) ![](https://hackmd.io/_uploads/Bky5q6lp3.png) 元件 register 04:35~07:25 暫時存放資訊 類似buffer ![](https://hackmd.io/_uploads/r1woi6xTh.png) 可以記錄15個port(0~14) 並且每個port的柱列長度為32 bit ![](https://hackmd.io/_uploads/H16O2TxTh.png) 注意: link 是使用TCLink (本身就存在一個 (放在link中) queue) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAC7bRd4iRZGzjY2CNrzRALVa/p4-utils-example/monitor_qlen?dl=0&subfolder_nav_tracking=1) 程式碼講解 03:50~08:40 實驗 08:44~14:40 量測佇列長度、時間(腳本) 11:20~14:40 --- ## [9](https://youtu.be/bEzE0MxCTjM) 封包複製 ![](https://hackmd.io/_uploads/ryh6lmfTn.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AADP3TlkYlkNcoBAXWGPArqpa/p4-utils-example/clone_example?dl=0&lst=) 程式碼講解 03:55~10:30 實驗 10:30~12:00 --- ## [10](https://youtu.be/ZSmobANlXoc) ![](https://hackmd.io/_uploads/SJmif7zTh.png) source routing [example1 code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAAHJIX_U4Zadjm6_ap0fqhZa/p4-utils-example/source_routing1?dl=0&lst=) example1 程式碼講解 12:15~31:10 [example2 code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AACVUlQObbLxzGWEBr-SrNl7a/p4-utils-example/source_routing2?dl=0&lst=) ![](https://hackmd.io/_uploads/HJ_WiQfa3.png) example2 程式碼講解 31:10~49:00 執行 49:00~56:20 --- ## [11](https://youtu.be/7iOBUQYBW1s) Broadcast [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AACwtxAacPyxkA_No2OJloKma/p4-utils-example/test-broadcast?dl=0&lst=) ![](https://hackmd.io/_uploads/HJbagNzTn.png) 程式碼講解 04:25~11:10 執行 11:10~14:50 --- ## [12](https://youtu.be/Aqo7lh0pWyU) ECMP ![](https://hackmd.io/_uploads/ryFpGNfa3.png) 存在多條等價路徑可供選擇時,隨機選取可以達到負載均衡,提高鏈路使用率 (相同flow(5-tuple)還是走同一路徑) 程式碼講解 04:30~27:35 (包含部分執行12:34) hash() 23:27~24:55 執行 27:35~31:14 ## [13](https://youtu.be/Aqo7lh0pWyU) ![](https://hackmd.io/_uploads/H1sfIy7ph.png) 在P4中 實現PacketIn [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAC8k-RcjtZ4DnDx3AKtYkz3a/p4-utils-example/send_to_cpu2?dl=0&subfolder_nav_tracking=1) 程式碼講解 04:00~35:42 (執行 09:30~) 在.json需要加上 "cpu_port": true 注意ping是雙向的所以會經過2次 controller --- ## [14](https://youtu.be/xmuEACKJ-tQ) recirculate example ![](https://hackmd.io/_uploads/ryuu6JQT3.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AABiTv3bxnMcoBdPwmCP1OQ6a/p4-utils-example/test-recirculate?dl=0&lst=) 程式碼講解 2:55~7:45 ![](https://hackmd.io/_uploads/ryuu0kmp3.png) hdr.ipv4.diffserv 就是傳統的tos field range `1..10` 1到10之間 `_` default 執行 07:45~ h1 ping -c 3 h2 -Q 11 -Q 可以設定 tos field 分析log 13:15~17:42 --- ## [15](https://youtu.be/E9XuuZsk_mA) Anti TCP SYN Port Scan [web](https://nqucsie.myqnapcloud.com/smallko/sdn/anti_tcp_syn_port_scan.htm) [code-anti_tcp_port_scan](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AADVDIPeSsgmOn4rSPr5RdCua/p4-utils-example/anti-tcp-port-scan?dl=0&lst=) [code-anti_tcp_port_scan3](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAD0GTm76ZmOK2Sx7MGBTdlya/p4-utils-example/anti-tcp-port-scan3?dl=0&lst=) 法1: 由P4檢測 原理: 統計SYN、SYN-ACK的個數或比例,正常情況下是1:1或是SYN略多 若SYN超過3個就有可能是SYN port scan ![](https://hackmd.io/_uploads/rJd-7xQTn.png) 程式碼講解 7:40~23:40 主要邏輯 14:05~22:40 ![](https://hackmd.io/_uploads/HkHtme76n.png) 分別設置 標號0~99 容量10bit(0~1023) 的 register(conter) ![](https://hackmd.io/_uploads/S11SVlma2.png) flowlet_map_index 暫存src_ip的hash (節省儲存空間) syn_count 暫存某個來源syn pkt數 syn_ack_count 暫存某個來源syn-ack pkt數 執行 23:40~ `nv -vnz -w [IP] 80-85` -v: verbose -n: numeric-only (不解析) -z: zero-I/O mode (scan用) nc -vnz 命令的作用是以 verbose(詳細)模式、禁用 DNS 解析、並使用 zero-I/O(零輸入/輸出)模式來測試網絡連接 -w: wait time 80-85 port scan的範圍 ![](https://hackmd.io/_uploads/HJ_L7Ompn.png) 結果: syn - syn-ack > 3時 就不forwarding而是直接drop --- 法2: 由controller檢測 程式碼講解 28:15~41:00 執行 41:00~43:20 --- ## [16](https://youtu.be/nqp_Qm631K4) Meter > 是用於測量和監控網絡流量的工具或機制 two-rate three-color meters 演算法 用處: 差異式服務 定義了2種傳送速度 Committed Information Rate,CIR Peak Information Rate,PIR ChatGPT: >![](https://hackmd.io/_uploads/S1RWtOman.png) CIR < PIR 若流量 < CIR : GREEN (tag) CIR < 流量 < PIR : YELLOW 流量 > PIR : RED [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAC69iOm_Jghjp51EJGcw1J4a/p4-utils-example/test-meter?dl=0&lst=) 程式碼講解 3:30~11:50 ![](https://hackmd.io/_uploads/H1fUc_X62.png) 10 (綠色底線)代表 meter的數量 (可以根據port的數量設定) 執行 11:50~14:00 --- ## [17](https://youtu.be/VqkiZVyJT_4?si=Kl8XvHb_17qHkIz3) multipath transmission 多重路徑傳輸 [舊版 web](https://nqucsie.myqnapcloud.com/smallko/sdn/MultipathP4.htm) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AADTXZ-EnYFPp1LLqeNNw6zFa/p4-utils-example/multipath?dl=0&lst=) ![](https://hackmd.io/_uploads/rkV_0aET3.png) 多路徑傳輸可能會失序 程式碼講解 3:15~19:40 P4不支援浮點數 原理: 設置30%的封包走A路徑、70%封包走B路徑 > 圖中 是 50% 50% 的範例 ![](https://hackmd.io/_uploads/B15x8URJ6.png) 在P4程式碼中,action區塊不能使用if-else語句,apply區塊才可以用if-else random(meta.result, (bit<8>)最小值,(bit<8>)最大值); `random(meta.result, (bit<8>)0,(bit<8>)100);` ![](https://hackmd.io/_uploads/rJ7aWCV6n.png) 執行 19:40~22:00 結果: 單路徑:約 0.5 Mbps ![](https://hackmd.io/_uploads/BJNKMCVT2.png) 多路徑:約 1.0 Mbps,但是會出現失序的問題,所以需要在applicatoin layer額外處理 ![](https://hackmd.io/_uploads/rkUvGAVT2.png) --- ## [18](https://youtu.be/4pFAD9R9M0k?si=rP2Wo-RmPqRaYSpG) 影像視訊串流 multiple queue [web](https://nqucsie.myqnapcloud.com/smallko/sdn/p4_rtp_h264.htm) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AACd0tdvpSJj0qu9Y1EjD3rHa/p4-utils-example/p4_queue_video?dl=0&lst=) ![](https://hackmd.io/_uploads/rJ6SmCETn.png) P4中 預設有8個queue(0~7),queue7是priority最高的 把影片傳輸的流量放在queue7便能優先維護傳輸品質(避免競爭) ![](https://hackmd.io/_uploads/SJ6gNRVa3.png) 程式碼講解 02:40~03:49 執行 03:49~09:30 設定output queue的深度,只允許50個封包 每秒傳輸速度 100 個封包 ![](https://hackmd.io/_uploads/ByGtVA463.png) 接收端 ffplay -i udp://10.0.3.1:1234 傳送端 ffmpeg -stream_loop -1 -re -i 1.mp4 -c copy -f mpegts udp://10.0.3.1:1234 -stream_loop -1 : 原本的影片只有300個畫片,每秒撥30個,只有10秒鐘,這個設定可以讓影片播完後繼續重新撥放 --- ## [19](https://youtu.be/6w3qxRW2Wqc?si=bAz262L4voltb19f) 深度封包檢測(Deep Packet Inspection,DPI) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AACRTol-7eI7TKQ4TF2yEZr7a/p4-utils-example/p4-dpi1?dl=0&lst=) [舊版 web](https://nqucsie.myqnapcloud.com/smallko/sdn/p4_dpi.htm) <pre> h1-s1-h2 | h3 </pre> 情境: h1與h2通訊過程中,s1把封包複製(10:30~11:20)一份到h3,h3檢查是否為HTTP協定(不是透過80port判斷,透過解析應用層資料),若是,則block h1與h2之間的通訊 DPI需要使用go語言、go-dpi庫 [安裝go-dpi](https://github.com/mushorg/go-dpi) go語言、go-dpi 安裝 4:30~8:50 程式碼講解 08:50~14:00 執行(跳過DPI程式講解) 14:00~16:23、19:00~22:40 服務端 在h2中,`python -m SimpleHTTPServer 800` 客戶端 `curl 10.0.2.1:800` 在p4app.json中,若設定"cpu_port": true ![](https://hackmd.io/_uploads/SJSLa04an.png) ifconfig 會看到多出了s1-cpu-eth1 ![](https://hackmd.io/_uploads/BkEn60NTh.png) s1-cpu-eth0: 在s1使用 s1-cpu-eth1: 在目前網路中,接收封包(所以go程式會在這個interface監聽) DPI程式講解(go語言) 16:23~18:50 --- ## [19](https://youtu.be/-__qV7d0C7g?si=8dXLNM7QLRhrT0as) [web](https://nqucsie.myqnapcloud.com/smallko/sdn/mininet-wifip4-roaming.htm) ![](https://hackmd.io/_uploads/SkcMzJB62.png) 程式碼講解 05:00~09:50 執行 09:50~11:50、22:55~29:32(最後面有留一個小問題) local controller程式碼講解 11:50~22:55 查看連線狀態 ![](https://hackmd.io/_uploads/SJp1NkBa3.png) --- [21](https://youtu.be/L8MkqoattrY?si=rwYm7NZeyQYRpOkq) load balancer for http service [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAC02gNhzOAmeTQuydf9SYdAa/p4-utils-example/connection-hash?dl=0&lst=) [web](https://nqucsie.myqnapcloud.com/smallko/sdn/LBP4.htm) P4-14 轉 P4-16 > p4c-bm2-ss --p4v 14 --pp basic.p4 connection-hash14.p4 其中 basic.p4 是 輸出的P4-16程式碼,connection-hash14.p4是輸入的P4-14程式碼 程式碼講解 5:10~14:45 執行 14:45~17:55 --- ## [22](https://youtu.be/kPA1emSyPRE?si=9M1zeBhtcD5cXad4) match ![](https://hackmd.io/_uploads/Bk70vGUT3.png) exact: 完全比對 lpm(longest prefix match): 遮罩、1多的優先(255.255.255.255) (少見)ternary: 比較dst_mac時 使用and與自訂的遮罩運算(實例 3:55~8:55) 可以設置priority(0最大) (少見)range: 比較UDP port number 將特定區間的封包送往特定port(實例 8:55~16:50) --- ## [**23**](https://youtu.be/fsOPoSpQnOU?si=liTu57z4F35JZAGm) Random Load Balancer [web](https://nqucsie.myqnapcloud.com/smallko/sdn/randomLB.htm) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAAwwS3Qk5UPK9eANfDE0WOga/p4-utils-example/lb-random?dl=0&lst=) 程式碼講解 6:18~31:50 執行 31:50~32:51 register random hash --- ## [24](https://youtu.be/th-HTa2ALig?si=Ly9dxMIoEgT4U2zn) source routing [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAA0lEHlIhEPZzkX1IqNOKjsa/p4-utils-example/source_routing3?dl=0&lst=) 程式碼講解 5:55~14:55 執行 14:55~18:47 --- ## [25](https://youtu.be/9OeEWuguB74?si=G6noFBNC_Jg68QzA) 讓不同交換機執行不同P4程式 ![](https://hackmd.io/_uploads/B1EKbqvTn.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAAda8Uo3ERY0AwLLzd_fHpda/p4-utils-example/2p4-1?dl=0&subfolder_nav_tracking=1) 程式碼講解 4:05~8:12 執行 8:12~9:00 --- ## [26](https://youtu.be/Ukk1vpUaO74?si=VlLOjVDKmDf2bHkr) 使用SVM對ICMP flow分類 [web](https://nqucsie.myqnapcloud.com/smallko/sdn/p4-svm.htm) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAB4MPcOnEo_dfJS-iDaekUka/p4-utils-example/test-svm?dl=0&lst=) hping3 惡意流量 influxdb 資料庫 logstash 資料收集 sklearn 實作svm 軟體安裝、設置 05:00~12:00 程式碼講解 15:20~19:45、27:50~30:15 實驗 19:45~27:50、30:15~35:10 --- ## [27](https://youtu.be/vmBzX6SnZTw?si=iBJIXgCl570F5_vC) round robin load balancer [web1](https://nqucsie.myqnapcloud.com/smallko/sdn/drrlb4.htm)、[web2(考慮了server發生錯誤時的應對機制)](https://nqucsie.myqnapcloud.com/smallko/sdn/drrlb4-fd.pdf) [code-lb-rrlb4](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAB3tKtAQ7AFxtTppLNkEseOa/p4-utils-example/lb-rrlb4?dl=0&lst=)、[code-lb-rrlb4-fd](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AABFcUW2P52LjPs7CZTEnlcFa/p4-utils-example/lb-rrlb4-fd?dl=0&lst=) 程式碼講解 03:20~19:00 執行 19:00~21:10 fd程式碼講解 21:10~26:15 fd執行 26:15~29:50 --- ## [28](https://youtu.be/DP0-fqlsaWc?si=HdnStaMEYyGQ7si5) Port Knocking [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AABvi5pwTTc--3FlrMQyqy0La/p4-utils-example/portknocking?dl=0&lst=) 執行 1:30~5:15 程式碼講解 5:15~18:30 ![](https://hackmd.io/_uploads/SJ22ByFT3.png) 使用curl去敲10號port 執行一次命令可能傳送多次封包 所以 第1次敲10號port時 設定成狀態1 上次port knocking時"也"是10號port 則執行drop()而不重設狀態,避免重複傳送導致機制失效 --- ## [29](https://youtu.be/Em66XJMAQls?si=-j7-wVWhgZTkBQ2l) Weighted Round Robin (WRR) 包含fault detection [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAB-YjqVlYUrDyugTldWuKe5a/p4-utils-example/lb-wrrlb4?dl=0&lst=) [web](https://csie1.nqu.edu.tw/smallko/sdn/wrrlb.htm) ![](https://hackmd.io/_uploads/rk55v1tT3.png) 程式碼講解 3:45~19:00 執行 19:00~20:40 --- ## [**30**](https://youtu.be/krH5NpYgvvY?si=NtNhwQsQZczw69cz) P4-utils : assignment strategy l2 全部都屬於同一個區域網路 ![](https://hackmd.io/_uploads/BkavakKT3.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAAvruAgqvsB57myfedqhEcca/p4-utils-example/p4utils-l2?dl=0&lst=) 程式碼講解 06:23~09:10 執行 09:10~10:30 l3 每條link都是獨立的網路 ![](https://hackmd.io/_uploads/Hk1pTytp2.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAAMTs9kyTK3fiJRZRxVxQ98a/p4-utils-example/p4utils-l3?dl=0&lst=) 程式碼講解 10:30~14:25 執行 14:25~15:05 mixed 主機相連:同個區域網路 switch相連:不同區域網路 ![](https://hackmd.io/_uploads/S1VaxeY62.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AADPMZUVKqhMGdnMpGlL4k78a/p4-utils-example/p4utils-mixed?dl=0&lst=) 程式碼講解 15:05~17:05 執行 17:05~17:35 manual 類似l3,但IP、gateway可以手動配置 ![](https://hackmd.io/_uploads/HJVAlgta2.png) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AACHRyz0OlcQQeSkKmh5KTwoa/p4-utils-example/p4utils-manual?dl=0&lst=) 程式碼講解 17:35~18:15 執行 18:15~18:45 --- ## [31](https://youtu.be/nHZLqhmj0FU?si=XRoGqTpm-j-NkD2o) [code](https://github.com/nsg-ethz/p4-learning/tree/master/exercises/06-Heavy_Hitter_Detector) 包含用scapy實現的 封包傳送/接收程式 Heavy Hitter Detector >可以當作一種DoS攻擊的防禦機制 用來源IP或應用程式埠號或application session(5-tuple)來作為攻擊單位 用hash來減少儲存空間 搭配counting bloom filter來減緩collision的發生 Bloom Filter 資料結構 05:10~10:40 >基本上就是透過多個hash function搭配降低碰撞率 程式碼講解 10:40~20:48 執行 20:48~22:10 --- ## [32]() 實作 High-Speed Data-Plane Packet Aggregation and Disaggregation by P4 Switches 程式碼講解 06:15~25:30 ![](https://hackmd.io/_uploads/rkNDdFYa2.png) 當buffer滿了 又有封包進來時 執行Aggregation(聚合) Aggregation具體內容 ![](https://hackmd.io/_uploads/rJHYYYt6n.png) ![](https://hackmd.io/_uploads/SJT9FYYT3.png) 執行 25:30~31:10 --- ## [33](https://youtu.be/LO9sSpl18AI?si=SnWrXsF1m1ZxLkXg) Generic Routing Encapsulation (GRE) 在兩個網路之間透過GRE Tunnel來協助溝通 傳統網路 與 P4網路 的整合 > P4-utils 只能模擬全部都是P4-switch的情境 [web](https://nqucsie.myqnapcloud.com/smallko/sdn/P4_GRE.htm) 共3組實驗:[第1組code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AADMY0FmGAugAXeTaSzWYIlta/p4-utils-example/test-gre.py?dl=0)、[第2組code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AACw9HSHVygRHnTTf8la_k9Oa/p4-utils-example/p4-gre?dl=0&lst=)、[第3組code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AABW9CinlO_FIr-Pa0RPegiWa/p4-utils-example/p4-gre2?dl=0&lst=) 實驗1、2(全部都是 傳統/P4 設備) 程式碼講解 07:40~29:10 ![](https://hackmd.io/_uploads/ryXczqFT3.png) 先把原有的部分IP欄位(src、dst...)copy到 inner_ip 再 把外層IP改為GRE Tunnel的 inner_ip:TTL+24 外層IP:TTL=255、Protocol=0x2f 封裝 ![](https://hackmd.io/_uploads/BJZEE5YTh.png) 傳達後要解析封包時,先把inner_ip的欄位複製到外層IP,再把GRE、inner_ip標頭設成Invalid inner_ip:TTL-24 解封裝 ![](https://hackmd.io/_uploads/H1GGN9YTh.png) 執行 29:10~30:15 ---- 實驗3 (傳統+P4, 不使用P4-utils) 程式碼講解 30:40~39:45 執行 39:45~41:10 basic.p4 to basic.json `p4c-bm2-ss --p4v 16 basic.p4 -o basic.json` --- ## [p4switch 1](https://youtu.be/-yLR4ynEK4I?si=L3VaPEL-M_TCuPSu) 將P4程式運行在實體機器上 h1 -- s1 -- h2 s1: ![](https://hackmd.io/_uploads/rkf_bhFah.png) > ifconfig ens37 192.168.1.254/24 這種設定有時候會失效(失效時重設就好) 要注意 h1: ![](https://hackmd.io/_uploads/r1mJf3tah.png) h2: ![](https://hackmd.io/_uploads/r1lOG2F6n.png) 可以互相ping後 把路由功能關閉 s1: ![](https://hackmd.io/_uploads/H12hMhtpn.png) 程式碼講解 09:50~11:40 編譯: `p4c-bm2-ss --p4v 16 ip_forward.p4 -o ip_forward.json` 執行 11:40~19:45 把目前機器變成P4 software switch `simple_switch -i 1@ens37 -i 2@ens38 --thrift-port 9090 --nanolog ipc:///tmp/bm-1-log.ipc --device-id 1 ip_forward.json --log-console` 1@ens37: 第1個port 2@ens38: 第2個port thrift-port 可以自己指定 --- ## [p4switch 2](https://youtu.be/uGRa1JBf7KY?si=LZ86xUldlYfRFhiR) 在docker中跑P4 法1: 01:43~02:23 法2: 02:23~05:51 (dockerhub) ![](https://hackmd.io/_uploads/Syh_whtT2.png) 環境設置 05:51~09:30 程式碼講解 09:30~11:25 執行 11:25~16:40 切換回mininet-wifi環境 16:40~17:24 [web](https://nqucsie.myqnapcloud.com/smallko/sdn/p4bmv2docker.htm) [code](https://www.dropbox.com/sh/9qzkarvkwehgn9q/AAA70WxYnrhdQuFZfWMD76wpa/server-test/test-dockerp4?dl=0&lst=) ---

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