Hi!

The Netfilter project proudly presents:

        nftables 1.0.3

This release contains new features available up to the Linux kernel 5.18 release:

* Support for wildcard interface name matching with sets:

     table inet testifsets {
        set simple_wild {
               type ifname
               flags interval
               elements = { "abcdef*",
                            "othername",
                            "ppp0" }
        }

        chain v4icmp {
                type filter hook input priority 0; policy accept;
                iifname @simple_wild counter packets 0 bytes 0
                iifname { "abcdef*", "eth0" } counter packets 0 bytes 0
        }
     }

* Support for runtime auto-merge of set elements. So far, the
  auto-merge routine could only coalesce elements in the set
  declaration.

     # cat ruleset.nft
     table ip x {
        set y {
                type ipv4_addr
                flags interval
                auto-merge
                elements = { 1.2.3.0, 1.2.3.255, 1.2.3.0/24,
                             3.3.3.3, 4.4.4.4, 4.4.4.4-4.4.4.8,
                             3.3.3.4, 3.3.3.5 }
        }
     }
     # nft -f ruleset.nft
     table ip x {
        set y {
                type ipv4_addr
                flags interval
                auto-merge
                elements = { 1.2.3.0/24, 3.3.3.3-3.3.3.5,
                             4.4.4.4-4.4.4.8 }
        }
     }

  with this update, incremental runtime updates are also supported:

     # nft add element ip x y { 1.2.3.0-1.2.4.255, 3.3.3.6 }
     # nft list ruleset
     table ip x {
        set y {
                type ipv4_addr
                flags interval
                auto-merge
                elements = { 1.2.3.0-1.2.4.255, 3.3.3.3-3.3.3.6,
                             4.4.4.4-4.4.4.8 }
        }
     }

   as shown above, new elements are merged into existing intervals
   whenever possible.

   This also supports for incremental runtime element removals that
   result in adjusting/splitting the existing intervals.

* Enhancements for the ruleset optimization -o/--optimize option which
  allows to coalesce several NAT rules into map:

     # cat ruleset.nft
     table ip x {
            chain y {
                    type nat hook postrouting priority srcnat; policy drop;
                    ip saddr 1.1.1.1 tcp dport 8000 snat to 4.4.4.4:80
                    ip saddr 2.2.2.2 tcp dport 8001 snat to 5.5.5.5:90
            }
     }

     # nft -o -c -f ruleset.nft
     Merging:
     ruleset.nft:4:3-52:                ip saddr 1.1.1.1 tcp dport 8000 snat to 4.4.4.4:80
     ruleset.nft:5:3-52:                ip saddr 2.2.2.2 tcp dport 8001 snat to 5.5.5.5:90
     into:
            snat to ip saddr . tcp dport map { 1.1.1.1 . 8000 : 4.4.4.4 . 80, 2.2.2.2 . 8001 : 5.5.5.5 . 90 }

  This infrastructure also learnt how to coalesce raw expressions into maps, for example:

     # cat ruleset.nft
     table ip x {
            [...]

            chain nat_dns_acme {
                    udp length 47-63 @th,160,128 0x0e373135363130333131303735353203 goto nat_dns_dnstc
                    udp length 62-78 @th,160,128 0x0e31393032383939353831343037320e goto nat_dns_this_5301
                    udp length 62-78 @th,160,128 0x0e31363436323733373931323934300e goto nat_dns_saturn_5301
                    udp length 62-78 @th,160,128 0x0e32393535373539353636383732310e goto nat_dns_saturn_5302
                    udp length 62-78 @th,160,128 0x0e38353439353637323038363633390e goto nat_dns_saturn_5303
                    drop
            }
     }

  When invoking 'nft' to request an optimization, several rules result
  in a map:

     # nft -c -o -f ruleset.
     Merging:
     ruleset.nft:8:17-98:                 udp length 47-63 @th,160,128 0x0e373135363130333131303735353203 goto nat_dns_dnstc
     ruleset.nft:9:17-102:                 udp length 62-78 @th,160,128 0x0e31393032383939353831343037320e goto nat_dns_this_5301
     ruleset.nft:10:17-104:                 udp length 62-78 @th,160,128 0x0e31363436323733373931323934300e goto nat_dns_saturn_5301
     ruleset.nft:11:17-104:                 udp length 62-78 @th,160,128 0x0e32393535373539353636383732310e goto nat_dns_saturn_5302
     ruleset.nft:12:17-104:                 udp length 62-78 @th,160,128 0x0e38353439353637323038363633390e goto nat_dns_saturn_5303
     into:
        udp length . @th,160,128 vmap { 47-63 . 0x0e373135363130333131303735353203 : goto nat_dns_dnstc, 62-78 . 0x0e31393032383939353831343037320e : goto nat_dns_this_5301, 62-78 . 0x0e31363436323733373931323934300e : goto nat_dns_saturn_5301, 62-78 . 0x0e32393535373539353636383732310e : goto nat_dns_saturn_5302, 62-78 . 0x0e38353439353637323038363633390e : goto nat_dns_saturn_5303 }

* Support for raw expressions in concatenations. For example, in anonymous sets:

     # nft add rule x y ip saddr . @ih,32,32 { 1.1.1.1 . 0x14, 2.2.2.2 . 0x1e }

  And, in explicit set declarations:

     table x {
            set y {
                    typeof ip saddr . @ih,32,32
                    elements = { 1.1.1.1 . 0x14 }
            }
     }

  (inner header/payload matching @ih keywork requires Linux kernel >= 5.16).

* Support for integer type protocol header fields in concatenations.

  For example, the udp length field relies on the integer datatype as
  shown by the 'nft describe' command:

     # nft describe udp length
     payload expression, datatype integer (integer), 16 bits

  you can now use it in set and map declarations through 'typeof':

     table inet t {
            map m1 {
                    typeof udp length . @ih,32,32 : verdict
                    flags interval
                    elements = { 20-80 . 0x14 : accept,
                                 1-10 . 0xa : drop }
            }

            chain c {
                    type filter hook input priority 0; policy drop;
                    udp length . @ih,32,32 vmap @m1
            }
     }

* Allow to reset TCP options (requires Linux kernel >= 5.18):

     tcp flags syn reset tcp option sack-perm

* Speed up chain listing command, ie. nft list chain x y

... this release also includes fixes (highlights):

- fix invalid listing in verdict maps
- several fixes for -o/--optimize (added in previous 1.0.2 release).
- fix anonymous object maps, for example:

      table inet filter {
             ct helper sip-5060u {
                     type "sip" protocol udp
                     l3proto ip
             }

             ct helper sip-5060t {
                     type "sip" protocol tcp
                     l3proto ip
             }

             chain input {
                     type filter hook input priority filter; policy accept;
                     ct helper set ip protocol . th dport map { udp . 10000-20000 : "sip-5060u", tcp . 10000-20000 : "sip-5060t" }
             }
      }

- fix build problems in nftables-1.0.2 tarball.
- fix JSON chain listing (https://bugzilla.netfilter.org/show_bug.cgi?id=1580)

... and incremental documentation updates.

You can download this new release from:

https://www.netfilter.org/projects/nftables/downloads.html
https://www.netfilter.org/pub/nftables/

To build the code, libnftnl >= 1.2.1 and libmnl >= 1.0.4 are required:

* https://netfilter.org/projects/libnftnl/index.html
* https://netfilter.org/projects/libmnl/index.html

Visit our wikipage for user documentation at:

* https://wiki.nftables.org

For the manpage reference, check man(8) nft.

In case of bugs and feature request, file them via:

* https://bugzilla.netfilter.org

Happy firewalling.