{"id":32586,"date":"2019-10-31T21:47:51","date_gmt":"2019-10-31T18:47:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp\/"},"modified":"2019-10-31T21:47:51","modified_gmt":"2019-10-31T18:47:51","slug":"kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","title":{"rendered":"L'azienda Cloudflare ha rilasciato xdpcap, un analizzatore di traffico basato sul sottomodulo XDP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

L'azienda Cloudflare ha presentato<\/a><\/noindex> progetto aperto xdpcap<\/a><\/noindex>, nell'ambito del quale si sviluppa un analizzatore di pacchetti di rete simile a tcpdump, costruito sulla base del sottosistema XDP<\/a><\/noindex> (eXpress Data Path). Il codice del progetto \u00e8 scritto in linguaggio Go e \u00e8 distribuito<\/a><\/noindex> sotto licenza BSD. Il progetto include anche \u00e8 stata preparata<\/a><\/noindex> una libreria per il binding degli handler eBPF per il traffico delle applicazioni in linguaggio Go.<\/p>\n

L'utilit\u00e0 xdpcap \u00e8 compatibile con le espressioni di filtraggio tcpdump\/libpcap e consente di elaborare su stesso hardware volumi di traffico significativamente maggiori. Xdpcap pu\u00f2 anche essere utilizzato per il debug in situazioni in cui tcpdump normale non \u00e8 applicabile, ad esempio quando sono in uso sistemi di filtraggio, protezione da attacchi DoS e bilanciamento del carico, che sfruttano il sottosistema XDP del kernel Linux, che elabora i pacchetti prima che vengano gestiti dallo stack di rete del kernel Linux (tcpdump non vede i pacchetti scartati dall'handler XDP).<\/p>\n

Alte prestazioni sono raggiunte grazie all'uso dei sottosistemi eBPF e XDP. L'eBPF \u00e8 un interprete di bytecode integrato nel kernel Linux, che consente di creare handler ad alte prestazioni per pacchetti in entrata\/uscita, con decisioni riguardo al loro reindirizzamento o scarto. Utilizzando un compilatore JIT, il bytecode eBPF viene tradotto in tempo reale in istruzioni macchina e viene eseguito con prestazioni paragonabili al codice nativo. Il sottosistema XDP (eXpress Data Path) integra l'eBPF permettendo di eseguire programmi BPF a livello del driver di rete, con supporto per l'accesso diretto al buffer DMA dei pacchetti e operando prima dell'allocazione del buffer skbuff dallo stack di rete.<\/p>\n

Come tcpdump, l'utilit\u00e0 xdpcap traduce inizialmente le regole di filtraggio del traffico ad alto livello in un formato BPF classico (cBPF) utilizzando la libreria standard libpcap, quindi le converte in una forma di sottoprogrammi eBPF, utilizzando il compilatore cbpfc<\/a><\/noindex>, utilizzando le funzionalit\u00e0 di LLVM\/Clang. In output, i dati sul traffico vengono salvati nel formato standard pcap, il che consente di utilizzare il dump di traffico preparato in xdpcap per ulteriori analisi con tcpdump e altri analizzatori di traffico esistenti. Ad esempio, per catturare dati sul traffico DNS, invece del comando \u00abtcpdump ip and udp port 53\u00bb, si pu\u00f2 eseguire \u00abxdpcap \/path\/to\/hook capture.pcap 'ip and udp port 53'\u00bb, dopodich\u00e9 utilizzare il file capture.pcap, ad esempio, con il comando \u00abtcpdump -r\u00bb o in Wireshark.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Cloudflare \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 xdpcap, \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u043e\u0445\u043e\u0436\u0438\u0439 \u043d\u0430 tcpdump \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0439 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b XDP (eXpress Data Path). \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 BSD. \u041f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0434\u043b\u044f \u043f\u0440\u0438\u0432\u044f\u0437\u043a\u0438 eBPF-\u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0438\u0437 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go. \u0423\u0442\u0438\u043b\u0438\u0442\u0430 xdpcap \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u0430 \u0441 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f\u043c\u0438 \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 tcpdump\/libpcap […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32586","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47L'azienda Cloudflare ha pubblicato xdpcap, un analizzatore di traffico basato sul sottosistema XDP | ProHoster","description":"L'azienda Cloudflare ha presentato un progetto 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