puppet nftables

#

# @summary allow incoming Link-Local Multicast Name Resolution

#

# @param ipv4 Allow LLMNR over IPv4

# @param ipv6 Allow LLMNR over IPv6

# @param iifname optional list of incoming interfaces to filter on

#

# @author Tim Meusel <tim@bastelfreak.de>

#

# @see https://datatracker.ietf.org/doc/html/rfc4795

#

class nftables::rules::llmnr (

  Boolean $ipv4 = true,

  Boolean $ipv6 = true,

  Array[String[1]] $iifname = [],

) {

  if empty($iifname) {

    $_iifname = ''

  } else {

    $iifdata = $iifname.map |String[1] $interface| { "\"${interface}\"" }.join(', ')

    $_iifname = "iifname { ${iifdata} } "

  }

  if $ipv4 {

    nftables::rule { 'default_in-llmnr_v4':

      content => "${_iifname}ip daddr 224.0.0.252 udp dport 5355 accept comment \"allow LLMNR\"",

    }

  }

  if $ipv6 {

    nftables::rule { 'default_in-llmnr_v6':

      content => "${_iifname}ip6 daddr ff02::1:3 udp dport 5355 accept comment \"allow LLMNR\"",

    }

  }

}