{"id":100285,"date":"2021-05-26T10:22:54","date_gmt":"2021-05-26T08:22:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-paketnogo-filtra-nftables-0-9-9"},"modified":"2021-05-26T10:22:54","modified_gmt":"2021-05-26T08:22:54","slug":"vypusk-paketnogo-filtra-nftables-0-9-9","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-paketnogo-filtra-nftables-0-9-9","title":{"rendered":"Az nftables 0.9.9 csomagsz\u0171r\u0151 kiad\u00e1sa","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent az nftables 0.9.9-es verzi\u00f3j\u00e1nak kiad\u00e1sa, amely egys\u00e9ges\u00edti a csomagsz\u0171r\u00e9si interf\u00e9szeket IPv4, IPv6, ARP \u00e9s h\u00e1l\u00f3zati hidak sz\u00e1m\u00e1ra (c\u00e9lja az iptables, ip6tables, arptables \u00e9s ebtables helyettes\u00edt\u00e9se). Ezzel egy id\u0151ben megjelent a libnftnl 1.2.0-\u00e1s verzi\u00f3ja is, amely egy alacsony szint\u0171 API-t biztos\u00edt a nf_tables alrendszerrel val\u00f3 interakci\u00f3hoz. Az nftables 0.9.9 m\u0171k\u00f6d\u00e9s\u00e9hez sz\u00fcks\u00e9ges v\u00e1ltoztat\u00e1sok be\u00e9p\u00edtve lettek a Linux 5.13-rc1 kernelbe.          <\/p>\n<p>Az nftables csomagba tartoznak a felhaszn\u00e1l\u00f3i t\u00e9rben m\u0171k\u00f6d\u0151 csomagsz\u0171r\u0151 komponensek, m\u00edg a kernel szintj\u00e9n az nf_tables alrendszer l\u00e1tja el a feladatot, amely a Linux kernel 3.13-as verzi\u00f3j\u00e1t\u00f3l kezdve \u00e9rhet\u0151 el. A kernel szintj\u00e9n csak egy \u00e1ltal\u00e1nos interf\u00e9sz \u00e1ll rendelkez\u00e9sre, amely f\u00fcggetlen a konkr\u00e9t protokollt\u00f3l, \u00e9s alapvet\u0151 funkci\u00f3kat biztos\u00edt a csomagokb\u00f3l sz\u00e1rmaz\u00f3 adatok kinyer\u00e9s\u00e9re, az adatokkal v\u00e9gzett m\u0171veletekre \u00e9s az adatfolyam kezel\u00e9s\u00e9re.    <\/p>\n<p>K\u00f6zvetlen\u00fcl a sz\u0171r\u00e9si szab\u00e1lyok \u00e9s a protokollspecifikus kezel\u0151k felhaszn\u00e1l\u00f3i t\u00e9rben b\u00e1jt k\u00f3dba vannak ford\u00edtva, majd ezt a b\u00e1jt k\u00f3dot a Netlink interf\u00e9sz seg\u00edts\u00e9g\u00e9vel bet\u00f6ltik a kernelbe, ahol speci\u00e1lis k\u00f6rnyezetben v\u00e9grehajt\u00e1sra ker\u00fcl. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/vps\/abuzoustojchivye-vps\/\"   title=\"virtu\u00e1lis g\u00e9pben\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4310\">virtu\u00e1lis g\u00e9pben<\/a>, amely a BPF (Berkeley Packet Filters) elj\u00e1r\u00e1sra eml\u00e9keztet. Ez a megk\u00f6zel\u00edt\u00e9s jelent\u0151sen cs\u00f6kkenti a kernel szinten m\u0171k\u00f6d\u0151 sz\u0171r\u00e9si k\u00f3d m\u00e9ret\u00e9t, mik\u00f6zben az \u00f6sszes szab\u00e1lyok parszol\u00e1s\u00e1val \u00e9s a protokollokkal kapcsolatos logik\u00e1val kapcsolatos funkci\u00f3t a felhaszn\u00e1l\u00f3i t\u00e9rbe helyezi.    <\/p>\n<p>F\u0151bb \u00faj\u00edt\u00e1sok:  <\/p>\n<ul>\n<li class=\"l\"> Megval\u00f3sult a flowtable feldolgoz\u00e1s\u00e1nak \u00e1tk\u00f6lt\u00f6ztet\u00e9se a h\u00e1l\u00f3zati adapter oldal\u00e1ra, amely a 'offload' jelz\u0151 seg\u00edts\u00e9g\u00e9vel aktiv\u00e1lhat\u00f3. A flowtable a csomagok \u00e1tir\u00e1ny\u00edt\u00e1si \u00fatvonal\u00e1nak optimaliz\u00e1l\u00e1s\u00e1ra szolg\u00e1l\u00f3 mechanizmus, ahol a szab\u00e1lyok \u00f6sszes l\u00e1ncolat\u00e1nak teljes v\u00e9gigj\u00e1r\u00e1sa csak az els\u0151 csomagra vonatkozik, m\u00edg az \u00f6sszes t\u00f6bbi csomag k\u00f6zvetlen\u00fcl \u00e1tengedhet\u0151.        table ip global {              flowtable f {                      hook ingress priority filter + 1                      devices = { lan3, lan0, wan }                      flags offload              }                chain forward {                      type filter hook forward priority filter; policy accept;                      ip protocol { tcp, udp } flow add @f              }                chain post {                      type nat hook postrouting priority filter; policy accept;                      oifname 'wan' masquerade              }      }\n<li class=\"l\"> Hozz\u00e1adva a tulajdonos \u00e1ltal t\u00f6rt\u00e9n\u0151 k\u00f6t\u00e9shez sz\u00fcks\u00e9ges flag, amely lehet\u0151v\u00e9 teszi a t\u00e1bl\u00e1zat kiz\u00e1r\u00f3lagos haszn\u00e1lat\u00e1t a folyamat \u00e1ltal. A folyamat befejez\u00e9s\u00e9vel a hozz\u00e1 kapcsolt t\u00e1bl\u00e1zat automatikusan t\u00f6rl\u00e9sre ker\u00fcl. A folyamat inform\u00e1ci\u00f3i komment\u00e1r form\u00e1j\u00e1ban jelennek meg a szab\u00e1lyok dump-j\u00e1ban:          table ip x { # progname nft              flags owner                chain y {                      type filter hook input priority filter; policy accept;                      counter packets 1 bytes 309              }      }\n<li class=\"l\"> Hozz\u00e1adva az IEEE 802.1ad (VLAN stacking vagy QinQ) specifik\u00e1ci\u00f3 t\u00e1mogat\u00e1sa, amely eszk\u00f6z\u00f6ket hat\u00e1roz meg t\u00f6bb VLAN c\u00edmke egy Ethernet keretbe val\u00f3 beilleszt\u00e9s\u00e9re. P\u00e9ld\u00e1ul a k\u00fcls\u0151 Ethernet keret 8021ad \u00e9s vlan id=342 t\u00edpus\u00e1nak ellen\u0151rz\u00e9s\u00e9hez a k\u00f6vetkez\u0151 konstrukci\u00f3 haszn\u00e1lhat\u00f3:        \u2026 ether type 802.1ad vlan id 342      a k\u00fcls\u0151 Ethernet keret 8021ad\/vlan id=1, be\u00e1gyazott 802.1q\/vlan id=2 \u00e9s az IP-csomag tov\u00e1bbi be\u00e1gyaz\u00e1s\u00e1nak ellen\u0151rz\u00e9s\u00e9re:         \u2026 ether type 802.1ad vlan id 1 vlan type 8021q vlan id 2 vlan type ip counter\n<li class=\"l\"> Hozz\u00e1adva a forr\u00e1shaszn\u00e1lat kezel\u00e9s\u00e9nek t\u00e1mogat\u00e1sa a cgroups v2 egys\u00e9ges hierarchi\u00e1j\u00e1val. A cgroups v2 legfontosabb k\u00fcl\u00f6nbs\u00e9ge a v1-t\u0151l az, hogy k\u00f6z\u00f6s hierarchi\u00e1t alkalmaz mindenf\u00e9le er\u0151forr\u00e1shoz, a CPU forr\u00e1skioszt\u00e1s, a mem\u00f3riafogyaszt\u00e1s \u00e9s a bemenet\/kimenet szab\u00e1lyoz\u00e1sa sz\u00e1m\u00e1ra.  P\u00e9ld\u00e1ul a socket \u0151s\u00e9nek cgroupv2 els\u0151 szint\u0171 maszkja 'system.slice' val\u00f3 megfelel\u0151s\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9re a k\u00f6vetkez\u0151 konstrukci\u00f3 haszn\u00e1lhat\u00f3:       \u2026 socket cgroupv2 level 1 'system.slice'\n<li class=\"l\"> Hozz\u00e1adva a SCTP csomagok alkot\u00f3elemeinek ellen\u0151rz\u00e9s\u00e9nek lehet\u0151s\u00e9ge (a sz\u00fcks\u00e9ges funkci\u00f3 a Linux 5.14 kernelben fog megjelenni). P\u00e9ld\u00e1ul a 'data' t\u00edpus\u00fa chunk-ban \u00e9s a 'type' mez\u0151ben l\u00e9v\u0151 megl\u00e9tel\u00e9nek ellen\u0151rz\u00e9s\u00e9re:       \u2026 sctp chunk data exists    \u2026 sctp chunk data type 0\n<li class=\"l\"> K\u00f6r\u00fclbel\u00fcl k\u00e9tszer gyorsabb\u00e1 v\u00e1lt a szab\u00e1lyok bet\u00f6lt\u00e9si m\u0171velete a '-f' jelz\u0151 haszn\u00e1lat\u00e1val. A szab\u00e1lyok list\u00e1j\u00e1nak ki\u00edr\u00e1sa is felgyorsult.\n<li class=\"l\"> Megb\u00edzhat\u00f3 m\u00f3dszer a bitv\u00e9delem ellen\u0151rz\u00e9s\u00e9re a z\u00e1szl\u00f3kban. P\u00e9ld\u00e1ul a snat \u00e9s dnat \u00e1llapotbitek ellen\u0151rz\u00e9s\u00e9re: &#8230; ct status ! snat,dnat; a syn bit ellen\u0151rz\u00e9s\u00e9re a syn,ack bitmaszkban: &#8230; tcp flags syn \/ syn,ack; a fin \u00e9s rst bitek ellen\u0151rz\u00e9s\u00e9re a syn,ack,fin,rst bitmaszkban: &#8230; tcp flags != fin,rst \/ syn,ack,fin,rst\n<li class=\"l\"> Az &#171;verdict&#187; kulcssz\u00f3 haszn\u00e1lata enged\u00e9lyezett a set\/map t\u00edpusok defin\u00edci\u00f3iban: add map x m { typeof iifname . ip protocol . th dport : verdict ;}    <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55214\">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 0.9.9, \u0443\u043d\u0438\u0444\u0438\u0446\u0438\u0440\u0443\u044e\u0449\u0435\u0433\u043e \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u044b \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 (\u043d\u0430\u0446\u0435\u043b\u0435\u043d \u043d\u0430 \u0437\u0430\u043c\u0435\u043d\u0443 iptables, ip6table, arptables \u0438 ebtables). \u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0441\u043e\u043f\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 libnftnl 1.2.0, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0438\u0437\u043a\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u0439 API \u0434\u043b\u044f \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u043e\u0439 nf_tables. \u041d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0435 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0432\u044b\u043f\u0443\u0441\u043a\u0430 nftables 0.9.9 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u044b \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux 5.13-rc1. \u0412 \u043f\u0430\u043a\u0435\u0442 [&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-100285","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 nftables 0.9.9, \u0443\u043d\u0438\u0444\u0438\u0446\u0438\u0440\u0443\u044e\u0449\u0435\u0433\u043e \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u044b \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0434\u043b\u044f IPv4, 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