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Diffstat (limited to 'lib/VyOS/Nptv6Rule.pm')
| -rw-r--r-- | lib/VyOS/Nptv6Rule.pm | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/lib/VyOS/Nptv6Rule.pm b/lib/VyOS/Nptv6Rule.pm new file mode 100644 index 0000000..3166325 --- /dev/null +++ b/lib/VyOS/Nptv6Rule.pm @@ -0,0 +1,161 @@ +# +# VyOS::Nptv6Rule: Update SNPT/DNPT ip6tables rules +# +# Copyright (C) 2014 VyOS Development Group <maintainers@vyos.net> +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 +# USA + + +package VyOS::Nptv6Rule; + +use strict; +use lib "/opt/vyatta/share/perl5"; +require Vyatta::Config; +require Vyatta::IpTables::AddressFilter; +use Vyatta::Misc; +use Vyatta::TypeChecker; + +require Exporter; +our @ISA = qw(Exporter); +our @EXPORT = qw(is_disabled rule_str); + +my %fields = ( + _rule_number => undef, + _outside_if => undef, + _inside_pfx => undef, + _outside_pfx => undef, + _disable => undef, +); + +sub new { + my $that = shift; + my $class = ref ($that) || $that; + my $self = { + %fields, + }; + + bless $self, $class; + return $self; +} + +sub setup { + my ( $self, $level ) = @_; + my $config = new Vyatta::Config; + + $config->setLevel("$level"); + + $self->{_rule_number} = $config->returnParent(".."); + $self->{_inside_if} = $config->returnValue("inside-interface"); + $self->{_outside_if} = $config->returnValue("outside-interface"); + $self->{_inside_pfx} = $config->returnValue("inside-prefix"); + $self->{_outside_pfx} = $config->returnValue("outside-prefix"); + + $self->{_disable} = $config->exists("disable"); + + return 0; +} + +# Make SNPT ip6tables string +# POSTROUTING +# ip6tables -t mangle -I VYOS_NPT_HOOK -s inside-pfx -o outside-if -j SNPT --src-pfx inside-pfx --dst-pfx outside-pfx +sub make_snpt_string { + my ($self) = @_; + my $snpt_str = ""; + + # Construct ip6tables string + $snpt_str .= "-I VYOS_SNPT_HOOK "; + $snpt_str .= "-s "; + $snpt_str .= $self->{_inside_pfx}; + if(defined($self->{_outside_if})) { + $snpt_str .= " -o "; + $snpt_str .= $self->{_outside_if}; + } + $snpt_str .= " -j SNPT --src-pfx "; + $snpt_str .= $self->{_inside_pfx}; + $snpt_str .= " --dst-pfx "; + $snpt_str .= $self->{_outside_pfx}; + + return $snpt_str; +} + +# Make DNPT ip6tables string +# PREROUTING +# ip6tables -t mangle -I VYOS_NPT_HOOK -d outside-pfx -i outside-if -j DNPT --src-pfx outside-pfx --dst-pfx inside-pfx +sub make_dnpt_string { + my ($self) = @_; + my $dnpt_str = ""; + + # Construct ip6tables string + $dnpt_str .= "-I VYOS_DNPT_HOOK "; + $dnpt_str .= "-d "; + $dnpt_str .= $self->{_outside_pfx}; + if(defined($self->{_outside_if})) { + $dnpt_str .= " -i "; + $dnpt_str .= $self->{_outside_if}; + } + $dnpt_str .= " -j DNPT --src-pfx "; + $dnpt_str .= $self->{_outside_pfx}; + $dnpt_str .= " --dst-pfx "; + $dnpt_str .= $self->{_inside_pfx}; + + return $dnpt_str; +} + +# Tests if the rule is valid, returns false if valid, returns error string if invalid +sub is_invalid { + my ($self) = @_; + + # Validate prefixes + if(!defined($self->{_inside_pfx}) || $self->{_inside_pfx} eq '') { + return "inside-prefix must be set"; + } + + if(!defined($self->{_outside_pfx}) || $self->{_outside_pfx} eq '') { + return "outside-prefix must be set"; + } + + if(!Vyatta::TypeChecker::validateType('ipv6net', $self->{_inside_pfx}, 1)) { + return "inside-prefix is not a valid prefix"; + } + + if(!Vyatta::TypeChecker::validateType('ipv6net', $self->{_outside_pfx}, 1)) { + return "outside-prefix is not a valid prefix"; + } + + return 0; +} + +# Returns an array of ip6tables parameters (SNPT, DNPT) +sub rule_str { + my ($self) = @_; + my $err; + + $err = $self->is_invalid(); + if($err ne 0) { + return ($err, undef, undef); + } + + return (undef, $self->make_snpt_string(), $self->make_dnpt_string()); +} + +sub is_disabled { + my $self = shift; + return 1 if defined $self->{_disable}; + return 0; +} + +1; + |