{"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\/cs\/blog\/news\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","title":{"rendered":"Spole\u010dnost Cloudflare zve\u0159ejnila xdpcap, analyz\u00e1tor provozu zalo\u017een\u00fd na subsyst\u00e9mu XDP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spole\u010dnost Cloudflare p\u0159edstavila<\/a><\/noindex> otev\u0159en\u00fd projekt xdpcap<\/a><\/noindex>, v jeho\u017e r\u00e1mci se vyv\u00edj\u00ed analyz\u00e1tor s\u00ed\u0165ov\u00fdch paket\u016f podobn\u00fd tcpdumpu, postaven\u00fd na z\u00e1klad\u011b subsyst\u00e9mu XDP<\/a><\/noindex> (eXpress Data Path). K\u00f3d projektu je naps\u00e1n v jazyce Go a distribuov\u00e1no<\/a><\/noindex> pod licenc\u00ed BSD. Projektem je tak\u00e9 byla p\u0159ipravena<\/a><\/noindex> knihovna pro v\u00e1z\u00e1n\u00ed eBPF zpracovatel\u016f traffic z aplikac\u00ed v jazyce Go.<\/p>\n

N\u00e1stroj xdpcap je kompatibiln\u00ed s v\u00fdrazov\u00fdmi filtry tcpdump\/libpcap a umo\u017e\u0148uje zpracov\u00e1vat na stejn\u00e9m hardwaru v\u00fdrazn\u011b v\u011bt\u0161\u00ed objemy trafik. Xdpcap m\u016f\u017ee b\u00fdt tak\u00e9 pou\u017eit pro lad\u011bn\u00ed v podm\u00ednk\u00e1ch, kdy je b\u011b\u017en\u00fd tcpdump nevhodn\u00fd, nap\u0159\u00edklad kdy\u017e jsou nasazeny syst\u00e9my filtrov\u00e1n\u00ed, ochrany proti DoS \u00fatok\u016fm a vyva\u017eov\u00e1n\u00ed z\u00e1t\u011b\u017ee, kter\u00e9 pou\u017e\u00edvaj\u00ed subsyst\u00e9m j\u00e1dra Linux XDP, zpracov\u00e1vaj\u00edc\u00ed pakety p\u0159ed t\u00edm, ne\u017e jsou zpracov\u00e1ny s\u00ed\u0165ov\u00fdm stekem j\u00e1dra Linux (tcpdump nevid\u00ed pakety, kter\u00e9 byly zahozeny zpracovatelem XDP).<\/p>\n

Vysok\u00fd v\u00fdkon je dosa\u017een d\u00edky pou\u017eit\u00ed subsyst\u00e9mu eBPF a XDP. eBPF je vestav\u011bn\u00fd interpret\u00e1tor bajtk\u00f3du v j\u00e1d\u0159e Linux, kter\u00fd umo\u017e\u0148uje vytv\u00e1\u0159et vysoce v\u00fdkonn\u00e9 zpracovatele p\u0159\u00edchoz\u00edch\/odchoz\u00edch paket\u016f, kte\u0159\u00ed rozhoduj\u00ed o jejich p\u0159esm\u011brov\u00e1n\u00ed nebo zahozen\u00ed. Pomoc\u00ed JIT kompil\u00e1toru je bajtk\u00f3d eBPF za b\u011bhu p\u0159ekl\u00e1d\u00e1n do strojov\u00fdch instrukc\u00ed a vykon\u00e1v\u00e1n s v\u00fdkonem nativn\u00edho k\u00f3du. Subsyst\u00e9m XDP (eXpress Data Path) dopl\u0148uje eBPF mo\u017enost\u00ed spou\u0161t\u011bt BPF programy na \u00farovni s\u00ed\u0165ov\u00e9ho ovlada\u010de, s podporou p\u0159\u00edm\u00e9ho p\u0159\u00edstupu k DMA buffer\u016fm paket\u016f a prac\u00ed ve st\u00e1diu p\u0159ed alokac\u00ed bufferu skbuff s\u00ed\u0165ov\u00fdm stekem.<\/p>\n

Stejn\u011b jako tcpdump n\u00e1stroj xdpcap nejprve p\u0159ekl\u00e1d\u00e1 vysoce\u00farov\u0148ov\u00e1 pravidla filtrace trafiku do klasick\u00e9ho zobrazen\u00ed BPF (cBPF) pomoc\u00ed standardn\u00ed knihovny libpcap, pot\u00e9 je transformuje do formy podprogram\u016f eBPF s vyu\u017eit\u00edm kompil\u00e1toru cbpfc<\/a><\/noindex>, vyu\u017e\u00edvaj\u00edc\u00ed v\u00fdvojov\u00e9 n\u00e1stroje LLVM\/Clang. Na v\u00fdstupu jsou informace o s\u00ed\u0165ov\u00e9m provozu ukl\u00e1d\u00e1ny ve standardn\u00edm form\u00e1tu pcap, co\u017e umo\u017e\u0148uje pou\u017e\u00edt p\u0159ipraven\u00fd dump provozu v xdpcap pro n\u00e1slednou anal\u00fdzu v tcpdump a dal\u0161\u00edch existuj\u00edc\u00edch analyz\u00e1torech provozu. Nap\u0159\u00edklad pro zachycen\u00ed informac\u00ed o DNS provozu lze m\u00edsto p\u0159\u00edkazu «tcpdump ip and udp port 53» spustit «xdpcap \/path\/to\/hook capture.pcap ‘ip and udp port 53′», po \u010dem\u017e lze soubor capture.pcap vyu\u017e\u00edt nap\u0159. s p\u0159\u00edkazem «tcpdump -r» nebo ve Wireshark.<\/p>\n

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

Zdroj: 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\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\udd47Spole\u010dnost Cloudflare zve\u0159ejnila xdpcap, analyz\u00e1tor provozu zalo\u017een\u00fd na podsystemu XDP | ProHoster","description":"Spole\u010dnost Cloudflare p\u0159edstavila otev\u0159en\u00fd 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