{"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\/pt\/blog\/news\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","title":{"rendered":"A empresa Cloudflare publicou o xdpcap, um analisador de tr\u00e1fego baseado no subsistema XDP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A empresa Cloudflare apresentou<\/a><\/noindex> projeto aberto xdpcap<\/a><\/noindex>, no qual \u00e9 desenvolvido um analisador de pacotes de rede semelhante ao tcpdump, baseado no subsistema XDP<\/a><\/noindex> (eXpress Data Path). O c\u00f3digo do projeto \u00e9 escrito na linguagem Go e \u00e9 distribu\u00eddo<\/a><\/noindex> licenciado sob a licen\u00e7a BSD. O projeto tamb\u00e9m preparada<\/a><\/noindex> inclui uma biblioteca para vincula\u00e7\u00e3o de manipuladores de tr\u00e1fego eBPF de aplica\u00e7\u00f5es em Go.<\/p>\n

A ferramenta xdpcap \u00e9 compat\u00edvel com express\u00f5es de filtragem tcpdump\/libpcap e permite processar volumes de tr\u00e1fego significativamente maiores no mesmo hardware. O xdpcap tamb\u00e9m pode ser utilizado para depura\u00e7\u00e3o em condi\u00e7\u00f5es onde o tcpdump convencional n\u00e3o \u00e9 aplic\u00e1vel, por exemplo, quando sistemas de filtragem, prote\u00e7\u00e3o contra ataques DoS e balanceamento de carga que utilizam o subsistema XDP do n\u00facleo Linux est\u00e3o em uso, processando pacotes antes que sejam tratados pela pilha de rede do n\u00facleo Linux (tcpdump n\u00e3o v\u00ea pacotes descartados pelo manipulador XDP).<\/p>\n

Desempenho elevado \u00e9 alcan\u00e7ado atrav\u00e9s da aplica\u00e7\u00e3o dos subsistemas eBPF e XDP. O eBPF \u00e9 um interpretador de bytecode embutido no n\u00facleo Linux que permite criar manipuladores de pacotes de entrada\/sa\u00edda de alto desempenho, tomando decis\u00f5es sobre seu redirecionamento ou descarte. Com um compilador JIT, o bytecode eBPF \u00e9 traduzido em instru\u00e7\u00f5es de m\u00e1quina em tempo real e executado com desempenho de c\u00f3digo nativo. O subsistema XDP (eXpress Data Path) complementa o eBPF, permitindo a execu\u00e7\u00e3o de programas BPF no n\u00edvel do driver de rede, com suporte ao acesso direto ao buffer DMA de pacotes e opera\u00e7\u00e3o antes da aloca\u00e7\u00e3o do buffer skbuff pela pilha de rede.<\/p>\n

Assim como o tcpdump, a ferramenta xdpcap inicialmente traduz regras de filtragem de tr\u00e1fego de alto n\u00edvel para a representa\u00e7\u00e3o BPF cl\u00e1ssica (cBPF) usando a biblioteca padr\u00e3o libpcap, em seguida transforma-as em forma de subprogramas eBPF, utilizando o compilador cbpfc<\/a><\/noindex>, utilizando desenvolvimentos do LLVM\/Clang. As informa\u00e7\u00f5es sobre o tr\u00e1fego s\u00e3o salvas no formato padr\u00e3o pcap, o que permite usar o dump de tr\u00e1fego preparado no xdpcap para estudo posterior no tcpdump e em outros analisadores de tr\u00e1fego existentes. Por exemplo, para capturar informa\u00e7\u00f5es sobre o tr\u00e1fego DNS, em vez do comando \u00abtcpdump ip and udp port 53\u00bb, pode-se executar \u00abxdpcap \/path\/to\/hook capture.pcap 'ip and udp port 53'\u00bb, ap\u00f3s o qual o arquivo capture.pcap pode ser usado, por exemplo, com o comando \u00abtcpdump -r\u00bb ou no 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\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\udd47A empresa Cloudflare lan\u00e7ou o xdpcap, um analisador de tr\u00e1fego baseado no sistema XDP | ProHoster","description":"A empresa Cloudflare apresentou um projeto 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