{"id":76505,"date":"2020-04-02T19:42:00","date_gmt":"2020-04-02T17:42:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-paketnogo-filtra-nftables-0-9-4"},"modified":"2020-04-02T19:42:00","modified_gmt":"2020-04-02T17:42:00","slug":"vypusk-paketnogo-filtra-nftables-0-9-4","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypusk-paketnogo-filtra-nftables-0-9-4","title":{"rendered":"Vyd\u00e1n\u00ed paketov\u00e9ho filtru nftables 0.9.4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/marc.info\/?l=netfilter&#038;m=158575148505527&#038;w=2\">Byl zve\u0159ejn\u011bn<\/a><\/noindex> vyd\u00e1n\u00ed paketov\u00e9ho filtru <noindex><a rel=\"nofollow\" href=\"https:\/\/netfilter.org\/projects\/nftables\/\">nftables 0.9.4<\/a><\/noindex>, vyv\u00edjej\u00edc\u00edho se jako n\u00e1hrada za iptables, ip6tables, arptables a ebtables d\u00edky unifikaci rozhran\u00ed pro filtrov\u00e1n\u00ed paket\u016f pro IPv4, IPv6, ARP a s\u00ed\u0165ov\u00e9 mosty. V bal\u00ed\u010dku nftables jsou zahrnuty komponenty paketov\u00e9ho filtru, kter\u00e9 funguj\u00ed v u\u017eivatelsk\u00e9m prostoru, zat\u00edmco na \u00farovni j\u00e1dra zaji\u0161\u0165uje funkce syst\u00e9m nf_tables, za\u010dlen\u011bn\u00fd do j\u00e1dra Linuxu od verze 3.13. Nezbytn\u00e9 zm\u011bny pro fungov\u00e1n\u00ed vyd\u00e1n\u00ed nftables 0.9.4 jsou zahrnuty v budouc\u00edch v\u011btv\u00edch j\u00e1dra. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52632\">Linux 5.6<\/a><\/noindex>.<\/p>\n<p>Na \u00farovni j\u00e1dra je poskytov\u00e1no pouze obecn\u00e9 rozhran\u00ed, kter\u00e9 nen\u00ed z\u00e1visl\u00e9 na konkr\u00e9tn\u00edm protokolu a poskytuje z\u00e1kladn\u00ed funkce pro extrakci dat z paket\u016f, prov\u00e1d\u011bn\u00ed operac\u00ed s daty a \u0159\u00edzen\u00ed toku. Pravidla filtrov\u00e1n\u00ed a specifick\u00e9 zpracov\u00e1va\u010de protokol\u016f jsou p\u0159\u00edmo kompilov\u00e1ny do bajtk\u00f3du v u\u017eivatelsk\u00e9m prostoru, po \u010dem\u017e je tento bajtk\u00f3d nahr\u00e1n do j\u00e1dra pomoc\u00ed rozhran\u00ed Netlink a prov\u00e1d\u011bn v j\u00e1d\u0159e ve speci\u00e1ln\u00edm virtu\u00e1ln\u00edm stroji, kter\u00fd p\u0159ipom\u00edn\u00e1 BPF (Berkeley Packet Filters). Tento p\u0159\u00edstup v\u00fdrazn\u011b zkracuje velikost k\u00f3du filtrov\u00e1n\u00ed b\u011b\u017e\u00edc\u00edho na \u00farovni j\u00e1dra a p\u0159en\u00e1\u0161\u00ed v\u0161echny funkce zpracov\u00e1n\u00ed pravidel a logiku pr\u00e1ce s protokoly do u\u017eivatelsk\u00e9ho prostoru.<\/p>\n<p>Hlavn\u00ed novinky:\n<\/p>\n<ul>\n<li class=\"l\"> Podpora rozsah\u016f v concatenac\u00edch (specifick\u00e9 kombinace adres a port\u016f usnad\u0148uj\u00edc\u00ed mapov\u00e1n\u00ed). Nap\u0159\u00edklad pro sadu \u201ewhitelist\u201c, jej\u00ed\u017e prvky jsou concatenac\u00ed, ozna\u010den\u00ed p\u0159\u00edznaku \u201einterval\u201c bude znamenat, \u017ee sada m\u016f\u017ee zahrnovat rozsahy v concatenaci (pro concatenaci \u201eipv4_addr . ipv4_addr . inet_service\u201c d\u0159\u00edve bylo mo\u017en\u00e9 vypisovat p\u0159esn\u00e9 shody typu \u201e192.168.10.35 . 192.68.11.123 . 80\u201c, nyn\u00ed je mo\u017en\u00e9 uv\u00e1d\u011bt skupiny adres \u201e192.168.10.35-192.168.10.40 . 192.68.11.123-192.168.11.125 . 80\u201c):\n<p>    tabulka ip foo {<br \/>\n           set whitelist {<br \/>\n                   typ ipv4_addr . ipv4_addr . inet_service<br \/>\n                   p\u0159\u00edznaky interval<br \/>\n                   prvky = { 192.168.10.35-192.168.10.40 . 192.68.11.123-192.168.11.125 . 80 }<br \/>\n           }<\/p>\n<p>           \u0159et\u011bzec bar {<br \/>\n                   typ filtru hook prerouting priorita filter; politika drop;<br \/>\n                   ip saddr . ip daddr . tcp dport @whitelist akceptovat<br \/>\n           }<br \/>\n    }<\/p>\n<li class=\"l\"> Ve skupin\u00e1ch a map\u00e1ch je zaji\u0161t\u011bna mo\u017enost pou\u017eit\u00ed direktivy \u201etypeof\u201c, kter\u00e1 ur\u010duje form\u00e1t prvku p\u0159i mapov\u00e1n\u00ed.<br \/>\n Nap\u0159\u00edklad:<\/p>\n<p>     tabulka ip foo {<br \/>\n            set whitelist {<br \/>\n                    typeof ip saddr<br \/>\n                    prvky = { 192.168.10.35, 192.168.10.101, 192.168.10.135 }<br \/>\n            }<\/p>\n<p>            \u0159et\u011bzec bar {<br \/>\n                    typ filtru hook prerouting priorita filter; politika drop;<br \/>\n                    ip daddr @whitelist akceptovat<br \/>\n            }<br \/>\n     }<\/p>\n<p>     tabulka ip foo {<br \/>\n            map addr2mark {<br \/>\n                typeof ip saddr : meta mark<br \/>\n                prvky = { 192.168.10.35 : 0x00000001, 192.168.10.135 : 0x00000002 }<br \/>\n            }<br \/>\n     }<\/p>\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost pou\u017eit\u00ed p\u0159ipojen\u00ed v NAT vazb\u00e1ch, co\u017e umo\u017e\u0148uje specifikovat adresu a port p\u0159i definov\u00e1n\u00ed NAT transformac\u00ed na z\u00e1klad\u011b map seznam\u016f nebo pojmenovan\u00fdch sad:\n<p>      nft add rule ip nat pre dnat ip addr . port to ip saddr map { 1.1.1.1 : 2.2.2.2 . 30 }<\/p>\n<p>      nft add map ip nat destinations { type ipv4_addr . inet_service : ipv4_addr . inet_service \\; }<br \/>\n      nft add rule ip nat pre dnat ip addr . port to ip saddr . tcp dport map @destinations<\/p>\n<li class=\"l\"> Podpora hardwarov\u00e9ho urychlen\u00ed s p\u0159en\u00e1\u0161en\u00edm n\u011bkter\u00fdch operac\u00ed filtrov\u00e1n\u00ed na s\u00ed\u0165ovou kartu. Urychlen\u00ed se aktivuje pomoc\u00ed n\u00e1stroje ethtool (\u201eethtool -K eth0 hw-tc-offload on\u201c), po \u010dem\u017e se aktivuje v nftables pro hlavn\u00ed \u0159et\u011bzec pomoc\u00ed p\u0159\u00edznaku \u201eoffload\u201c. P\u0159i pou\u017eit\u00ed j\u00e1dra Linux 5.6 je podporov\u00e1no hardwarov\u00e9 urychlen\u00ed pro mapov\u00e1n\u00ed pol\u00ed hlavi\u010dky a kontrolu p\u0159\u00edchoz\u00edho rozhran\u00ed v kombinaci s p\u0159\u00edjmem, odm\u00edtnut\u00edm, duplikov\u00e1n\u00edm (dup) a p\u0159esm\u011brov\u00e1n\u00edm (fwd) paket\u016f. V n\u00ed\u017ee uveden\u00e9m p\u0159\u00edkladu jsou operace odm\u00edtnut\u00ed paket\u016f, kter\u00e9 p\u0159ich\u00e1zej\u00ed z adresy 192.168.30.20, prov\u00e1d\u011bny na \u00farovni s\u00ed\u0165ov\u00e9 karty, bez p\u0159ed\u00e1v\u00e1n\u00ed paket\u016f j\u00e1dru:\n<p>     # cat file.nft<br \/>\n     table netdev x {<br \/>\n            chain y {<br \/>\n                type filter hook ingress device eth0 priority 10; flags offload;<br \/>\n                ip saddr 192.168.30.20 drop<br \/>\n            }<br \/>\n     }<br \/>\n     # nft -f file.nft<\/p>\n<li class=\"l\"> Bylo vylep\u0161eno informov\u00e1n\u00ed o m\u00edst\u011b chyby v pravidlech.\n<p>     # nft delete rule ip y z handle 7<br \/>\n     Error: Could not process rule: No such file or directory<br \/>\n     delete rule ip y z handle 7<br \/>\n                    ^<\/p>\n<p>     # nft delete rule ip x x handle 7<br \/>\n     Error: Could not process rule: No such file or directory<br \/>\n     delete rule ip x x handle 7<br \/>\n                               ^<\/p>\n<p>     # nft delete table twst<br \/>\n     Error: No such file or directory; did you mean table \u2018test\u2019 in family ip?<br \/>\n     delete table twst<br \/>\n                  ^^^^<\/p>\n<p>V prvn\u00edm p\u0159\u00edkladu je uk\u00e1z\u00e1no, \u017ee tabulka \u201ey\u201c chyb\u00ed v syst\u00e9mu, ve druh\u00e9m, \u017ee je chyb\u011bj\u00edc\u00ed zpracovatel \u201e7\u201c, a ve t\u0159et\u00edm, \u017ee je zobrazena n\u00e1pov\u011bda k p\u0159eklepu p\u0159i zad\u00e1v\u00e1n\u00ed jm\u00e9na tabulky.<\/p>\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora pro kontrolu slave rozhran\u00ed pomoc\u00ed ozna\u010den\u00ed \u201emeta sdif\u201c nebo \u201emeta sdifname\u201c:\n<p>        \u2026 meta sdifname vrf1 \u2026<\/p>\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora pro operaci posunu doprava nebo doleva. Nap\u0159\u00edklad pro posunut\u00ed existuj\u00edc\u00ed zna\u010dky paketu doleva o 1 bit a nastaven\u00ed ni\u017e\u0161\u00edho bitu na 1:\n<p>        \u2026 meta mark set meta mark lshift 1 or 0x1 \u2026<\/p>\n<li class=\"l\"> Byla implementov\u00e1na mo\u017enost \u201e-V\u201c pro zobrazen\u00ed podrobn\u00fdch informac\u00ed o verzi.\n<p>     # nft -V<br \/>\n       nftables v0.9.4 (Jive at Five)<br \/>\n          cli:          readline<br \/>\n          json:         yes<br \/>\n          minigmp:      no<br \/>\n          libxtables:   yes<\/p>\n<li class=\"l\"> Mo\u017enosti p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku nyn\u00ed mus\u00ed b\u00fdt v\u017edy uvedeny p\u0159ed p\u0159\u00edkazy. Nap\u0159\u00edklad je t\u0159eba uv\u00e1d\u011bt \u201enft -a list ruleset\u201c, zat\u00edmco spu\u0161t\u011bn\u00ed \u201enft list ruleset -a\u201c povede k zobrazen\u00ed chyby.\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52656\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u0433\u043e \u0444\u0438\u043b\u044c\u0442\u0440\u0430 nftables 0.9.4, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e\u0441\u044f \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0437\u0430\u043c\u0435\u043d\u044b iptables, ip6table, arptables \u0438 ebtables \u0437\u0430 \u0441\u0447\u0451\u0442 \u0443\u043d\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u0432 \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0434\u043b\u044f IPv4, IPv6, ARP \u0438 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043c\u043e\u0441\u0442\u043e\u0432. \u0412 \u043f\u0430\u043a\u0435\u0442 nftables \u0432\u0445\u043e\u0434\u044f\u0442 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u0433\u043e \u0444\u0438\u043b\u044c\u0442\u0440\u0430, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0435 \u0432 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u0432 \u0442\u043e \u0432\u0440\u0435\u043c\u044f \u043a\u0430\u043a \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0440\u0430\u0431\u043e\u0442\u0443 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 nf_tables, \u0432\u0445\u043e\u0434\u044f\u0449\u0430\u044f \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux [&hellip;]<\/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-76505","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u0433\u043e \u0444\u0438\u043b\u044c\u0442\u0440\u0430\" \/>\n\t<meta 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