{"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\/hu\/blog\/news\/vypusk-paketnogo-filtra-nftables-0-9-4","title":{"rendered":"Az nftables 0.9.4 csomagsz\u0171r\u0151 kiad\u00e1sa","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\">Megjelent<\/a><\/noindex> csomagsz\u0171r\u0151 kiad\u00e1sa <noindex><a rel=\"nofollow\" href=\"https:\/\/netfilter.org\/projects\/nftables\/\">nftables 0.9.4<\/a><\/noindex>, amely az iptables, ip6tables, arptables \u00e9s ebtables helyettes\u00edt\u00e9s\u00e9re fejl\u0151dik, a csomagsz\u0171r\u00e9si interf\u00e9szek egys\u00e9ges\u00edt\u00e9s\u00e9vel IPv4, IPv6, ARP \u00e9s h\u00e1l\u00f3zati hidak sz\u00e1m\u00e1ra. Az nftables csomagba tartoznak a felhaszn\u00e1l\u00f3i t\u00e9rben m\u0171k\u00f6d\u0151 csomagsz\u0171r\u0151 \u00f6sszetev\u0151k, m\u00edg a kernel szintj\u00e9n a nf_tables alrendszer v\u00e9gzi a munk\u00e1t, amely a Linux kernelben 3.13 kiad\u00e1s \u00f3ta el\u00e9rhet\u0151. Az nftables 0.9.4 kiad\u00e1s\u00e1hoz sz\u00fcks\u00e9ges m\u00f3dos\u00edt\u00e1sok a j\u00f6v\u0151beli kernel \u00e1gba ker\u00fcltek. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52632\">Linux 5.6<\/a><\/noindex>.<\/p>\n<p>A kernel szintj\u00e9n csup\u00e1n egy \u00e1ltal\u00e1nos interf\u00e9sz \u00e9rhet\u0151 el, amely f\u00fcggetlen a konkr\u00e9t protokolt\u00f3l, \u00e9s alapvet\u0151 funkci\u00f3kat ny\u00fajt az adatok csomagokb\u00f3l val\u00f3 kinyer\u00e9s\u00e9re, adatokkal val\u00f3 m\u0171veletek v\u00e9grehajt\u00e1s\u00e1ra \u00e9s az \u00e1raml\u00e1s kezel\u00e9s\u00e9re. A sz\u0171r\u00e9si szab\u00e1lyok \u00e9s a protokoll-specifikus feldolgoz\u00f3k k\u00f6zvetlen\u00fcl felhaszn\u00e1l\u00f3i t\u00e9rben byte-k\u00f3dra vannak leford\u00edtva, amelyet ezut\u00e1n a Netlink interf\u00e9sz seg\u00edts\u00e9g\u00e9vel t\u00f6ltenek be a kernelbe, \u00e9s egy speci\u00e1lis virtu\u00e1lis g\u00e9pben hajtanak v\u00e9gre a kernelben, amely hasonl\u00edt a BPF (Berkeley Packet Filter) m\u0171k\u00f6d\u00e9s\u00e9re. Ez a megk\u00f6zel\u00edt\u00e9s jelent\u0151sen cs\u00f6kkenti a kernel szintj\u00e9n m\u0171k\u00f6d\u0151 sz\u0171r\u00e9si k\u00f3d m\u00e9ret\u00e9t, valamint a szab\u00e1lyok parsingj\u00e1t \u00e9s a protokollokkal val\u00f3 logikai munk\u00e1t a felhaszn\u00e1l\u00f3i t\u00e9rbe helyezi.<\/p>\n<p>F\u0151bb \u00faj\u00edt\u00e1sok:\n<\/p>\n<ul>\n<li class=\"l\"> T\u00e1mogat\u00e1s a tartom\u00e1nyok csatol\u00e1s\u00e1ban (concatenation, meghat\u00e1rozott c\u00edm- \u00e9s portk\u00f6t\u00e9sek, amelyek megk\u00f6nny\u00edtik a lek\u00e9pez\u00e9st). P\u00e9ld\u00e1ul a &#171;whitelist&#187; halmaz eset\u00e9ben, amelynek elemei csatol\u00e1s, a &#171;interval&#187; jelz\u0151 megad\u00e1sa azt jelzi, hogy a halmaz tartalmazhat tartom\u00e1nyokat a csatol\u00e1sban (a &#171;ipv4_addr . ipv4_addr . inet_service&#187; csatol\u00e1s eset\u00e9ben r\u00e9gebben pontos egyez\u00e9seket lehetett felsorolni, mint p\u00e9ld\u00e1ul &#171;192.168.10.35 . 192.68.11.123 . 80&#187;, most viszont c\u00edmcsoportokat lehet megadni, mint &#171;192.168.10.35-192.168.10.40 . 192.68.11.123-192.168.11.125 . 80&#187;):\n<p>    t\u00e1bla ip foo {<br \/>\n           halmaz whitelist {<br \/>\n                   t\u00edpus ipv4_addr . ipv4_addr . inet_service<br \/>\n                   jelz\u0151k interval<br \/>\n                   elemek = { 192.168.10.35-192.168.10.40 . 192.68.11.123-192.168.11.125 . 80 }<br \/>\n           }<\/p>\n<p>           l\u00e1nc bar {<br \/>\n                   t\u00edpus sz\u0171r\u0151 hook prerouting priority filter; politikai drop;<br \/>\n                   ip saddr . ip daddr . tcp dport @whitelist accept<br \/>\n           }<br \/>\n    }<\/p>\n<li class=\"l\"> A halmazokban \u00e9s map-list\u00e1kban lehet\u0151s\u00e9g van a &#171;typeof&#187; utas\u00edt\u00e1s haszn\u00e1lat\u00e1ra, amely meghat\u00e1rozza az elem form\u00e1tum\u00e1t a lek\u00e9pez\u00e9s sor\u00e1n.<br \/>\n P\u00e9ld\u00e1ul:<\/p>\n<p>     t\u00e1bla ip foo {<br \/>\n            halmaz whitelist {<br \/>\n                    typeof ip saddr<br \/>\n                    elemek = { 192.168.10.35, 192.168.10.101, 192.168.10.135 }<br \/>\n            }<\/p>\n<p>            l\u00e1nc bar {<br \/>\n                    t\u00edpus sz\u0171r\u0151 hook prerouting priority filter; politikai drop;<br \/>\n                    ip daddr @whitelist accept<br \/>\n            }<br \/>\n     }<\/p>\n<p>     t\u00e1bla ip foo {<br \/>\n            map addr2mark {<br \/>\n                typeof ip saddr : meta mark<br \/>\n                elemek = { 192.168.10.35 : 0x00000001, 192.168.10.135 : 0x00000002 }<br \/>\n            }<br \/>\n     }<\/p>\n<li class=\"l\"> Hozz\u00e1adva a NAT-k\u00f6t\u00e9sekben val\u00f3 csatlakoz\u00e1sok haszn\u00e1lat\u00e1nak lehet\u0151s\u00e9ge, amely lehet\u0151v\u00e9 teszi az IP-c\u00edm \u00e9s a port megad\u00e1s\u00e1t NAT-transzform\u00e1ci\u00f3k meghat\u00e1roz\u00e1sakor map-list\u00e1k vagy n\u00e9vleges k\u00e9szletek alapj\u00e1n:\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\"> Hardveres gyors\u00edt\u00e1s t\u00e1mogat\u00e1sa, amely a sz\u0171r\u00e9s bizonyos m\u0171veleteit a h\u00e1l\u00f3zati k\u00e1rtya kez\u00e9be adja. A gyors\u00edt\u00e1s az ethtool seg\u00e9dprogramon kereszt\u00fcl kapcsolhat\u00f3 be (&#171;ethtool -K eth0 hw-tc-offload on&#187;), majd aktiv\u00e1lhat\u00f3 az nftables f\u0151 l\u00e1nc\u00e1ban az &#171;offload&#187; jelz\u0151vel. Az 5.6-os Linux kernellel haszn\u00e1lva a hardveres gyors\u00edt\u00e1s t\u00e1mogatja a fejl\u00e9cek mez\u0151inek lek\u00e9pez\u00e9s\u00e9t \u00e9s a bej\u00f6v\u0151 interf\u00e9sz ellen\u0151rz\u00e9s\u00e9t, egy\u00fctt a csomagok fogad\u00e1s\u00e1val, eldob\u00e1s\u00e1val, m\u00e1sol\u00e1s\u00e1val (dup) \u00e9s tov\u00e1bb\u00edt\u00e1s\u00e1val (fwd). Az al\u00e1bbi p\u00e9ld\u00e1ban a 192.168.30.20 c\u00edmr\u0151l \u00e9rkez\u0151 csomagok eldob\u00e1s\u00e1nak m\u0171velete a h\u00e1l\u00f3zati k\u00e1rtya szintj\u00e9n t\u00f6rt\u00e9nik, an\u00e9lk\u00fcl, hogy a csomagokat a kernelhez tov\u00e1bb\u00edtan\u00e1k:\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\"> Jav\u00edtva lett a hibahely \u00e9rtes\u00edt\u00e9s a szab\u00e1lyokban.\n<p>     # nft delete rule ip y z handle 7<br \/>\n     Hiba: A szab\u00e1ly feldolgoz\u00e1sa nem siker\u00fclt: Nincs ilyen f\u00e1jl vagy k\u00f6nyvt\u00e1r<br \/>\n     delete rule ip y z handle 7<br \/>\n                    ^<\/p>\n<p>     # nft delete rule ip x x handle 7<br \/>\n     Hiba: A szab\u00e1ly feldolgoz\u00e1sa nem siker\u00fclt: Nincs ilyen f\u00e1jl vagy k\u00f6nyvt\u00e1r<br \/>\n     delete rule ip x x handle 7<br \/>\n                               ^<\/p>\n<p>     # nft delete table twst<br \/>\n     Hiba: Nincs ilyen f\u00e1jl vagy k\u00f6nyvt\u00e1r; akartad mondani a &#226;&#8364;&#732;test&#8217; t\u00e1bl\u00e1t a csal\u00e1dban ip?<br \/>\n     delete table twst<br \/>\n                  ^^^^<\/p>\n<p>Az els\u0151 p\u00e9ld\u00e1b\u00f3l kider\u00fcl, hogy a &#171;y&#187; t\u00e1bla hi\u00e1nyzik a rendszerb\u0151l, a m\u00e1sodikb\u00f3l, hogy a &#171;7&#187; kezel\u0151 nem tal\u00e1lhat\u00f3, a harmadikb\u00f3l pedig, hogy javaslatot ad a t\u00e1blan\u00e9v elg\u00e9pel\u00e9s\u00e9re.<\/p>\n<li class=\"l\"> A &#171;meta sdif&#187; vagy &#171;meta sdifname&#187; megad\u00e1s\u00e1val hozz\u00e1adva a slave-interf\u00e9sz ellen\u0151rz\u00e9s\u00e9t:\n<p>        &#8230; meta sdifname vrf1 &#8230;<\/p>\n<li class=\"l\"> Hozz\u00e1adva a jobbra vagy balra t\u00f6rt\u00e9n\u0151 eltol\u00e1s m\u0171velet t\u00e1mogat\u00e1sa. P\u00e9ld\u00e1ul, hogy egy megl\u00e9v\u0151 csomagm\u00e1rk\u00e1t balra 1 bitre toljun \u00e9s a legkisebb bitet 1-re \u00e1ll\u00edtsuk:\n<p>        &#8230; meta mark set meta mark lshift 1 or 0x1 &#8230;<\/p>\n<li class=\"l\"> Megval\u00f3s\u00edtva a &#171;-V&#187; opci\u00f3, amely kib\u0151v\u00edtett inform\u00e1ci\u00f3t jelen\u00edt meg a verzi\u00f3r\u00f3l.\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\"> A parancssori opci\u00f3kat mostant\u00f3l k\u00f6telez\u0151 megadni a parancsok el\u0151tt. P\u00e9ld\u00e1ul &#171;nft -a list ruleset&#187; megad\u00e1sa sz\u00fcks\u00e9ges, m\u00edg a &#171;nft list ruleset -a&#187; futtat\u00e1sa hiba\u00fczenetet eredm\u00e9nyez.\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <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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