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#
# 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->{_outside_if} = $config->returnValue("outbound-interface");
$self->{_inside_pfx} = $config->returnValue("source prefix");
$self->{_outside_pfx} = $config->returnValue("translation 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;
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