mirror of
https://gitlab.com/shorewall/code.git
synced 2024-11-22 07:33:43 +01:00
Implement Stateless NAT support.
Signed-off-by: Tom Eastep <teastep@shorewall.net>
This commit is contained in:
Tom Eastep
parent
71480ff647
commit
0b2a8b12c7
@ -63,6 +63,7 @@ our @EXPORT = qw(
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%chain_table
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$raw_table
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$rawpost_table
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$nat_table
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$mangle_table
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$filter_table
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@ -113,6 +114,8 @@ our %EXPORT_TAGS = (
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zone_input_chain
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use_input_chain
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output_chain
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prerouting_chain
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postrouting_chain
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zone_output_chain
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use_output_chain
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masq_chain
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@ -132,6 +135,7 @@ our %EXPORT_TAGS = (
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ensure_mangle_chain
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ensure_nat_chain
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ensure_raw_chain
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ensure_rawpost_chain
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new_standard_chain
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new_builtin_chain
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new_nat_chain
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@ -262,6 +266,7 @@ our $VERSION = 'MODULEVERSION';
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#
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our %chain_table;
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our $raw_table;
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our $rawpost_table;
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our $nat_table;
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our $mangle_table;
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our $filter_table;
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@ -492,11 +497,13 @@ sub initialize( $$$ ) {
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( $family, my $hard, $export ) = @_;
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%chain_table = ( raw => {},
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rawpost => {},
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mangle => {},
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nat => {},
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filter => {} );
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$raw_table = $chain_table{raw};
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$rawpost_table = $chain_table{rawpost};
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$nat_table = $chain_table{nat};
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$mangle_table = $chain_table{mangle};
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$filter_table = $chain_table{filter};
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@ -1582,6 +1589,22 @@ sub output_chain($)
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$_[0] . '_out';
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}
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#
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# Prerouting Chain for an interface
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#
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sub prerouting_chain($)
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{
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$_[0] . '_pre';
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}
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#
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# Prerouting Chain for an interface
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#
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sub postrouting_chain($)
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{
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$_[0] . '_post';
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}
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#
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# Output Chain for a zone
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#
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@ -2044,6 +2067,14 @@ sub ensure_raw_chain($) {
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$chainref;
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}
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sub ensure_rawpost_chain($) {
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my $chain = $_[0];
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my $chainref = ensure_chain 'rawpost', $chain;
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$chainref->{referenced} = 1;
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$chainref;
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}
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#
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# Add a builtin chain
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#
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@ -2200,6 +2231,8 @@ sub initialize_chain_table($) {
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new_builtin_chain 'raw', $chain, 'ACCEPT';
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}
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new_builtin_chain 'rawpost', 'POSTROUTING', 'ACCEPT';
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for my $chain ( qw(INPUT OUTPUT FORWARD) ) {
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new_builtin_chain 'filter', $chain, 'DROP';
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}
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@ -2243,6 +2276,8 @@ sub initialize_chain_table($) {
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new_builtin_chain 'raw', $chain, 'ACCEPT';
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}
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new_builtin_chain 'rawpost', 'POSTROUTING', 'ACCEPT';
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for my $chain ( qw(INPUT OUTPUT FORWARD) ) {
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new_builtin_chain 'filter', $chain, 'DROP';
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}
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@ -2718,7 +2753,7 @@ sub optimize_level8( $$$ ) {
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}
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sub optimize_ruleset() {
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for my $table ( qw/raw mangle nat filter/ ) {
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for my $table ( qw/raw rawpost mangle nat filter/ ) {
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next if $family == F_IPV6 && $table eq 'nat';
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@ -5433,6 +5468,7 @@ sub create_netfilter_load( $ ) {
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my @table_list;
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push @table_list, 'raw' if have_capability( 'RAW_TABLE' );
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push @table_list, 'rawpost' if have_capability( 'RAWPOST_TABLE' );
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push @table_list, 'nat' if have_capability( 'NAT_ENABLED' );
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push @table_list, 'mangle' if have_capability( 'MANGLE_ENABLED' ) && $config{MANGLE_ENABLED};
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push @table_list, 'filter';
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@ -5535,6 +5571,7 @@ sub preview_netfilter_load() {
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my @table_list;
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push @table_list, 'raw' if have_capability( 'RAW_TABLE' );
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push @table_list, 'rawpost' if have_capability( 'RAWPOST_TABLE' );
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push @table_list, 'nat' if have_capability( 'NAT_ENABLED' );
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push @table_list, 'mangle' if have_capability( 'MANGLE_ENABLED' ) && $config{MANGLE_ENABLED};
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push @table_list, 'filter';
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@ -5644,7 +5681,7 @@ sub create_chainlist_reload($) {
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for my $chain ( @chains ) {
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( $table , $chain ) = split ':', $chain if $chain =~ /:/;
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fatal_error "Invalid table ( $table )" unless $table =~ /^(nat|mangle|filter|raw)$/;
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fatal_error "Invalid table ( $table )" unless $table =~ /^(nat|mangle|filter|raw|rawpost)$/;
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$chains{$table} = {} unless $chains{$table};
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@ -5673,7 +5710,7 @@ sub create_chainlist_reload($) {
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enter_cat_mode;
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for $table ( qw(raw nat mangle filter) ) {
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for $table ( qw(raw rawpost nat mangle filter) ) {
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my $tableref=$chains{$table};
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next unless $tableref;
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@ -5749,6 +5786,7 @@ sub create_stop_load( $ ) {
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my @table_list;
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push @table_list, 'raw' if have_capability( 'RAW_TABLE' );
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push @table_list, 'rawpost' if have_capability( 'RAWPOST_TABLE' );
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push @table_list, 'nat' if have_capability( 'NAT_ENABLED' );
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push @table_list, 'mangle' if have_capability( 'MANGLE_ENABLED' ) && $config{MANGLE_ENABLED};
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push @table_list, 'filter';
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@ -307,6 +307,7 @@ our %config_files = ( #accounting => 1,
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refresh => 1,
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refreshed => 1,
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restored => 1,
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rawnat => 1,
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route_rules => 1,
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routes => 1,
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routestopped => 1,
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@ -1166,6 +1166,12 @@ sub add_interface_jumps {
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addnatjump 'PREROUTING' , input_chain( $interface ) , imatch_source_dev( $interface );
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addnatjump 'POSTROUTING' , output_chain( $interface ) , imatch_dest_dev( $interface );
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addnatjump 'POSTROUTING' , masq_chain( $interface ) , imatch_dest_dev( $interface );
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if ( have_capability 'RAWPOST_TABLE' ) {
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insert_ijump ( $rawpost_table->{POSTROUTING}, j => postrouting_chain( $interface ), 0, imatch_dest_dev( $interface) ) if $rawpost_table->{postrouting_chain $interface};
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insert_ijump ( $raw_table->{PREROUTING}, j => prerouting_chain( $interface ), 0, imatch_source_dev( $interface) ) if $raw_table->{prerouting_chain $interface};
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insert_ijump ( $raw_table->{OUTPUT}, j => output_chain( $interface ), 0, imatch_dest_dev( $interface) ) if $raw_table->{output_chain $interface};
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}
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}
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#
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# Add the jumps to the interface chains from filter FORWARD, INPUT, OUTPUT
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@ -416,12 +416,14 @@ sub setup_netmap() {
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for my $interface ( split_list $interfacelist, 'interface' ) {
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my @rulein;
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my @ruleout;
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my $iface = $interface;
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fatal_error "Unknown interface ($interface)" unless my $interfaceref = known_interface( $interface );
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unless ( $type =~ /:/ ) {
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my @rulein;
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my @ruleout;
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unless ( $interfaceref->{root} ) {
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@rulein = imatch_source_dev( $interface );
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@ruleout = imatch_dest_dev( $interface );
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@ -435,6 +437,44 @@ sub setup_netmap() {
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} else {
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fatal_error "Invalid type ($type)";
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}
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} elsif ( $type =~ /^(DNAT|SNAT):([POT])$/ ) {
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my ( $target , $chain ) = ( $1, $2 );
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my $table = 'raw';
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my @match = ();
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unless ( $interfaceref->{root} ) {
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@match = imatch_dest_dev( $interface );
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$interface = $interfaceref->{name};
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}
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if ( $chain eq 'P' ) {
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$chain = prerouting_chain $interface;
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@match = imatch_source_dev( $iface ) unless $iface eq $interface;
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} elsif ( $chain eq 'O' ) {
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$chain = output_chain $interface;
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} else {
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$chain = postrouting_chain $interface;
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$table = 'rawpost';
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}
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if ( $target eq 'DNAT' ) {
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add_ijump( ensure_chain( $table, $chain ) ,
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j => 'RAWDNAT',
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targetopts => "--to-dest $net2",
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imatch_source_net( $net3 ) ,
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imatch_dest_net( $net1 ) ,
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@match );
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} else {
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add_ijump( ensure_chain( $table, $chain ) ,
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j => 'RAWSNAT',
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targetopts => "--to-source $net2",
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imatch_dest_net( $net3 ) ,
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imatch_source_net( $net1 ) ,
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@match );
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}
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} else {
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fatal_error "Invalid type ($type)";
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}
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progress_message " Network $net1 on $iface mapped to $net2 ($type)";
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}
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@ -445,6 +485,83 @@ sub setup_netmap() {
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}
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#
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# Setup Raw NAT
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#
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sub setup_rawnat() {
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if ( my $fn = open_file 'rawnat' ) {
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first_entry( sub { progress_message2 "$doing $fn..."; require_capability 'RAWPOST_TABLE' , 'a non-empty rawnat file' , 's'; } );
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while ( read_a_line ) {
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my ( $type, $net1, $interfacelist, $net2, $net3 ) = split_line 4, 5, 'rawnat file';
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validate_net $net1, 0;
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validate_net $net2, 0;
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$net3 = ALLIP if $net3 eq '-';
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for my $interface ( split_list $interfacelist, 'interface' ) {
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my @rulein;
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my @ruleout;
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my $iface = $interface;
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fatal_error "Unknown interface ($interface)" unless my $interfaceref = known_interface( $interface );
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unless ( $interfaceref->{root} ) {
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@rulein = imatch_source_dev( $interface );
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@ruleout = imatch_dest_dev( $interface );
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$interface = $interfaceref->{name};
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}
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if ( $type =~ /^(DNAT|SNAT):([POT])$/ ) {
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my ( $target , $chain ) = ( $1, $2 );
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my $table = 'raw';
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my $match = 'o';
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if ( $chain eq 'P' ) {
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$chain = prerouting_chain $interface;
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$match = 'i';
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} elsif ( $chain eq 'O' ) {
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$chain = output_chain $interface;
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} else {
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$chain = postrouting_chain $interface;
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$table = 'rawpost';
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}
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if ( $target eq 'DNAT' ) {
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add_ijump( ensure_chain( $table, $chain ) ,
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j => 'RAWDNAT',
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targetopts => "--to-dest $net2",
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imatch_source_net( $net3 ) ,
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imatch_dest_net( $net1 ) ,
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$match => $interface,
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$interfaceref->{root} ? () : @rulein );
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} else {
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add_ijump( ensure_chain( $table, $chain ) ,
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j => 'RAWSNAT',
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targetopts => "--to-source $net2",
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imatch_dest_net( $net3 ) ,
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imatch_source_net( $net1 ) ,
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$match => $interface,
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$interfaceref->{root} ? () : @ruleout );
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}
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} else {
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fatal_error "Invalid type ($type)";
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}
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progress_message " $net1 on $iface mapped to $net2 ($type)";
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}
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}
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clear_comment;
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}
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}
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sub add_addresses () {
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if ( @addresses_to_add ) {
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my @addrs = @addresses_to_add;
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@ -525,7 +525,7 @@ show_command() {
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[ $# -eq 1 ] && usage 1
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case $2 in
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mangle|nat|filter|raw)
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mangle|nat|filter|raw|rawpost)
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table=$2
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table_given=Yes
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;;
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@ -602,6 +602,13 @@ show_command() {
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show_reset
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$IPTABLES -t raw -L $g_ipt_options
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;;
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rawpost)
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[ $# -gt 1 ] && usage 1
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echo "$g_product $SHOREWALL_VERSION RAWPOST Table at $g_hostname - $(date)"
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echo
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show_reset
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$IPTABLES -t rawpost -L $g_ipt_options
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;;
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tos|mangle)
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[ $# -gt 1 ] && usage 1
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echo "$g_product $SHOREWALL_VERSION Mangle Table at $g_hostname - $(date)"
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@ -1435,7 +1435,7 @@ usage() # $1 = exit status
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echo " restart [ -n ] [ -p ] [-d] [ -f ] [ -c ][ <directory> ]"
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echo " restore [ -n ] [ <file name> ]"
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echo " save [ <file name> ]"
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echo " show [ -x ] [ -t {filter|mangle|nat} ] [ {chain [<chain> [ <chain> ... ]"
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echo " show [ -x ] [ -t {filter|mangle|nat|raw|rawpost} ] [ {chain [<chain> [ <chain> ... ]"
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echo " show actions"
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echo " show [ -f ] capabilities"
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echo " show classifiers"
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@ -1448,7 +1448,7 @@ usage() # $1 = exit status
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echo " show [ -m ] log [<regex>]"
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echo " show macro <macro>"
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echo " show macros"
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echo " show [ -x ] mangle|nat|raw|routing"
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echo " show [ -x ] mangle|nat|raw|rawpost|routing"
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echo " show policies"
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echo " show tc [ device ]"
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echo " show vardir"
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@ -510,7 +510,7 @@ show_command() {
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[ $# -eq 1 ] && usage 1
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case $2 in
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mangle|nat|filter|raw)
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mangle|nat|filter|raw|rawpost)
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table=$2
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table_given=Yes
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;;
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@ -165,7 +165,12 @@
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firewall 1.</para>
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</listitem>
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</itemizedlist>
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</important> The entries in
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</important></para>
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<section id="Solution">
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<title>If you are running Shorewall 4.4.22 or Earlier</title>
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<para>The entries in
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<filename><filename>/etc/shorewall/netmap</filename></filename> in
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firewall1 would be as follows:</para>
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@ -173,8 +178,8 @@
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SNAT 192.168.1.0/24 vpn 10.10.11.0/24 #RULE 1A
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DNAT 10.10.11.0/24 vpn 192.168.1.0/24 #RULE 1B</programlisting>
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<para>The entry in <filename>/etc/shorewall/netmap</filename> in firewall2
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would be:</para>
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<para>The entry in <filename>/etc/shorewall/netmap</filename> in
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firewall2 would be:</para>
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<programlisting>#TYPE NET1 INTERFACE NET2
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DNAT 10.10.10.0/24 vpn 192.168.1.0/24 #RULE 2A
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@ -184,13 +189,13 @@ SNAT 192.168.1.0/24 vpn 10.10.10.0/24 #RULE 2B</programlist
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<title>192.168.1.4 in the top cloud connects to 192.168.1.27 in the
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bottom cloud</title>
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<para>In order to make this connection, the client attempts a connection
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to 10.10.10.27. The following table shows how the source and destination
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IP addresses are modified as requests are sent and replies are returned.
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The RULE column refers to the above
|
||||
<para>In order to make this connection, the client attempts a
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connection to 10.10.10.27. The following table shows how the source
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and destination IP addresses are modified as requests are sent and
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replies are returned. The RULE column refers to the above
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<filename>/etc/shorewall/netmap</filename> entries and gives the rule
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which transforms the source and destination IP addresses to those shown
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on the next line. <informaltable>
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which transforms the source and destination IP addresses to those
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shown on the next line. <informaltable>
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<tgroup cols="5">
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<thead>
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<row>
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@ -281,9 +286,38 @@ SNAT 192.168.1.0/24 vpn 10.10.10.0/24 #RULE 2B</programlist
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</tbody>
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</tgroup>
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</informaltable></para>
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<para>See the<ulink url="OPENVPN.html"> OpenVPN documentation</ulink>
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for a solution contributed by Nicola Moretti for resolving duplicate
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networks in a roadwarrior VPN environment.</para>
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</example>
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</section>
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<section>
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<title>If you are running Shorewall 4.4.23 or Later</title>
|
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<para>Beginning with Shorewall 4.4.23, you <emphasis>can</emphasis>
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bridge two duplicate networks with one router, provided that your kernel
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and iptables include <emphasis>Rawpost Table Support</emphasis>. That
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support is used to implement Stateless NAT which allows for performing
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DNAT in the rawpost table POSTROUTING and OUTPUT chains and for
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performing SNAT in the raw table PREROUTING chain. Using this support,
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only firewall1 requires <filename>/etc/shorewall/netmap</filename>. Two
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additional entries are added.</para>
|
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<programlisting>#TYPE NET1 INTERFACE NET2
|
||||
SNAT 192.168.1.0/24 vpn 10.10.11.0/24
|
||||
DNAT 10.10.11.0/24 vpn 192.168.1.0/24
|
||||
<emphasis role="bold">SNAT:P 192.168.1.0/24 vpn 10.10.10.0/24
|
||||
DNAT:T 10.10.10.0/24 vpn 192.168.1.0/24</emphasis></programlisting>
|
||||
|
||||
<para>The last two entries define Stateless NAT by specifying a chain
|
||||
designator (:P for PREROUTING and :T for POSTROUTING respectively). See
|
||||
<ulink url="manpages/shorewall-netlink.html">shorewall-netmap</ulink>
|
||||
(5) for details.</para>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section id="Notes">
|
||||
<title>Author's Notes</title>
|
||||
|
||||
@ -301,19 +335,4 @@ SNAT 192.168.1.0/24 vpn 10.10.10.0/24 #RULE 2B</programlist
|
||||
bottom cloud to be able to establish connections with the 192.168.1.0/24
|
||||
network in the top cloud.</para>
|
||||
</section>
|
||||
|
||||
<section id="WhyTwo">
|
||||
<title>Can't I do this with one router? Why do I need two?</title>
|
||||
|
||||
<para>I wrote this article before Shorewall included <ulink
|
||||
url="MultiISP.html">multiple provider support</ulink>. You should be able
|
||||
to accomplish the same thing with just one router through careful use of
|
||||
/etc/shorewall/netmap and <ulink url="MultiISP.html">multiple
|
||||
providers</ulink>. If you try it and get it working, please contribute an
|
||||
update to this article.</para>
|
||||
|
||||
<para>See the<ulink url="OPENVPN.html"> OpenVPN documentation</ulink> for
|
||||
a solution contributed by Nicola Moretti for resolving duplicate networks
|
||||
in a roadwarrior VPN environment.</para>
|
||||
</section>
|
||||
</article>
|
||||
|
||||
@ -36,19 +36,39 @@
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term><emphasis role="bold">TYPE</emphasis> - <emphasis
|
||||
role="bold">DNAT</emphasis>|<emphasis
|
||||
role="bold">SNAT</emphasis></term>
|
||||
role="bold">{DNAT</emphasis>|<emphasis
|
||||
role="bold">SNAT}[:{P|O|T}</emphasis>]</term>
|
||||
|
||||
<listitem>
|
||||
<para>Must be DNAT or SNAT.</para>
|
||||
<para>Must be DNAT or SNAT; beginning with Shorewall 4.4.23, may be
|
||||
optionally followed by :P, :O or :T to perform <firstterm>stateless
|
||||
NAT</firstterm>. Stateless NAT requires <firstterm>Rawpost Table
|
||||
support</firstterm> in your kernel and iptables (see the output of
|
||||
<command>shorewall show capabilities</command>).</para>
|
||||
|
||||
<para>If DNAT, traffic entering INTERFACE and addressed to NET1 has
|
||||
its destination address rewritten to the corresponding address in
|
||||
NET2.</para>
|
||||
<para>If DNAT or DNAT:P, traffic entering INTERFACE and addressed to
|
||||
NET1 has its destination address rewritten to the corresponding
|
||||
address in NET2.</para>
|
||||
|
||||
<para>If SNAT, traffic leaving INTERFACE with a source address in
|
||||
NET1 has it's source address rewritten to the corresponding address
|
||||
in NET2.</para>
|
||||
<para>If SNAT or SNAT:T, traffic leaving INTERFACE with a source
|
||||
address in NET1 has it's source address rewritten to the
|
||||
corresponding address in NET2.</para>
|
||||
|
||||
<para>If DNAT:O, traffic originating on the firewall and leaving via
|
||||
INTERFACE and addressed to NET1 has its destination address
|
||||
rewritten to the corresponding address in NET2.</para>
|
||||
|
||||
<para>If DNAT:P, traffic entering via INTERFACE and addressed to
|
||||
NET1 has its destination address rewritten to the corresponding
|
||||
address in NET2.</para>
|
||||
|
||||
<para>If SNAT:T, traffic leaving via INTERFACE with a source address
|
||||
in NET1 has it's source address rewritten to the corresponding
|
||||
address in NET2.</para>
|
||||
|
||||
<para>If SNAT:O, traffic originating on the firewall and leaving via
|
||||
INTERFACE with a source address in NET1 has it's source address
|
||||
rewritten to the corresponding address in NET2.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
@ -114,12 +134,13 @@
|
||||
url="http://shorewall.net/netmap.html">http://shorewall.net/netmap.html</ulink></para>
|
||||
|
||||
<para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
|
||||
shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5), shorewall-ipsets(5),
|
||||
shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5),
|
||||
shorewall-params(5), shorewall-policy(5), shorewall-providers(5),
|
||||
shorewall-proxyarp(5), shorewall-route_rules(5),
|
||||
shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5), shorewall-secmarks(5),
|
||||
shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
|
||||
shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)</para>
|
||||
shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5),
|
||||
shorewall-ipsets(5), shorewall-maclist(5), shorewall-masq(5),
|
||||
shorewall-nat(5), shorewall-params(5), shorewall-policy(5),
|
||||
shorewall-providers(5), shorewall-proxyarp(5), shorewall-route_rules(5),
|
||||
shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
|
||||
shorewall-secmarks(5), shorewall-tcclasses(5), shorewall-tcdevices(5),
|
||||
shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5),
|
||||
shorewall-zones(5)</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
@ -463,7 +463,7 @@
|
||||
<arg><option>-l</option></arg>
|
||||
|
||||
<arg><option>-t</option>
|
||||
{<option>filter</option>|<option>mangle</option>|<option>nat</option>|<option>raw</option>}</arg>
|
||||
{<option>filter</option>|<option>mangle</option>|<option>nat</option>|<option>raw|rawpost</option>}</arg>
|
||||
|
||||
<arg><arg><option>chain</option></arg><arg choice="plain"
|
||||
rep="repeat"><replaceable>chain</replaceable></arg></arg>
|
||||
@ -520,7 +520,7 @@
|
||||
|
||||
<arg><option>-x</option></arg>
|
||||
|
||||
<arg choice="req"><option>mangle|nat|raw</option></arg>
|
||||
<arg choice="req"><option>mangle|nat|routing|raw|rawpost</option></arg>
|
||||
</cmdsynopsis>
|
||||
|
||||
<cmdsynopsis>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user