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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@9096 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
664 lines
20 KiB
Perl
664 lines
20 KiB
Perl
#
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# Shorewall-perl 4.2 -- /usr/share/shorewall-perl/Shorewall/Providers.pm
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#
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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 2007,2008 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# This module deals with the /etc/shorewall/providers and
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# /etc/shorewall/route_rules files.
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#
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package Shorewall::Providers;
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require Exporter;
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use Shorewall::Config qw(:DEFAULT :internal);
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use Shorewall::IPAddrs;
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use Shorewall::Zones;
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use Shorewall::Chains qw(:DEFAULT :internal);
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use strict;
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our @ISA = qw(Exporter);
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our @EXPORT = qw( setup_providers @routemarked_interfaces);
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our @EXPORT_OK = qw( initialize lookup_provider );
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our $VERSION = 4.2.4;
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use constant { LOCAL_TABLE => 255,
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MAIN_TABLE => 254,
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DEFAULT_TABLE => 253,
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UNSPEC_TABLE => 0
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};
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our @routemarked_providers;
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our %routemarked_interfaces;
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our @routemarked_interfaces;
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our $balance;
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our $first_default_route;
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our %providers;
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our @providers;
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our $family;
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#
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# Initialize globals -- we take this novel approach to globals initialization to allow
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# the compiler to run multiple times in the same process. The
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# initialize() function does globals initialization for this
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# module and is called from an INIT block below. The function is
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# also called by Shorewall::Compiler::compiler at the beginning of
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# the second and subsequent calls to that function.
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#
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sub initialize( $ ) {
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$family = shift;
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@routemarked_providers = ();
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%routemarked_interfaces = ();
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@routemarked_interfaces = ();
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$balance = 0;
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$first_default_route = 1;
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%providers = ( local => { number => LOCAL_TABLE , mark => 0 , optional => 0 } ,
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main => { number => MAIN_TABLE , mark => 0 , optional => 0 } ,
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default => { number => DEFAULT_TABLE , mark => 0 , optional => 0 } ,
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unspec => { number => UNSPEC_TABLE , mark => 0 , optional => 0 } );
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@providers = ();
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}
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INIT {
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initialize( F_IPV4 );
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}
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#
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# Set up marking for 'tracked' interfaces.
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#
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sub setup_route_marking() {
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my $mask = $config{HIGH_ROUTE_MARKS} ? '0xFF00' : '0xFF';
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require_capability( 'CONNMARK_MATCH' , 'the provider \'track\' option' , 's' );
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require_capability( 'CONNMARK' , 'the provider \'track\' option' , 's' );
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add_rule $mangle_table->{PREROUTING} , "-m connmark ! --mark 0/$mask -j CONNMARK --restore-mark --mask $mask";
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add_rule $mangle_table->{OUTPUT} , "-m connmark ! --mark 0/$mask -j CONNMARK --restore-mark --mask $mask";
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my $chainref = new_chain 'mangle', 'routemark';
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my %marked_interfaces;
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for my $providerref ( @routemarked_providers ) {
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my $interface = $providerref->{interface};
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my $base = uc chain_base $interface;
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add_command( $chainref, qq(if [ -n "\$${base}_IS_UP" ]; then) ), incr_cmd_level( $chainref ) if $providerref->{optional};
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unless ( $marked_interfaces{$interface} ) {
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add_rule $mangle_table->{PREROUTING} , "-i $interface -m mark --mark 0/$mask -j routemark";
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$marked_interfaces{$interface} = 1;
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}
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if ( $providerref->{shared} ) {
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add_rule $chainref, " -i $interface -m mac --mac-source $providerref->{mac} -j MARK --set-mark $providerref->{mark}";
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} else {
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add_rule $chainref, " -i $interface -j MARK --set-mark $providerref->{mark}";
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}
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decr_cmd_level( $chainref), add_command( $chainref, "fi" ) if $providerref->{optional};
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}
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add_rule $chainref, "-m mark ! --mark 0/$mask -j CONNMARK --save-mark --mask $mask";
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}
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sub copy_table( $$$ ) {
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my ( $duplicate, $number, $realm ) = @_;
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if ( $realm ) {
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emit ( "ip -$family route show table $duplicate | sed -r 's/ realm [[:alnum:]_]+//' | while read net route; do" )
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} else {
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emit ( "ip -$family route show table $duplicate | while read net route; do" )
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}
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emit ( ' case $net in',
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' default|nexthop)',
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' ;;',
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' *)',
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" run_ip route add table $number \$net \$route $realm",
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' ;;',
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' esac',
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"done\n"
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);
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}
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sub copy_and_edit_table( $$$$ ) {
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my ( $duplicate, $number, $copy, $realm) = @_;
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if ( $realm ) {
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emit ( "ip -$family route show table $duplicate | sed -r 's/ realm [[:alnum:]_]+//' | while read net route; do" )
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} else {
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emit ( "ip -$family route show table $duplicate | while read net route; do" )
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}
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emit ( ' case $net in',
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' default|nexthop)',
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' ;;',
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' *)',
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' case $(find_device $route) in',
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" $copy)",
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" run_ip route add table $number \$net \$route $realm",
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' ;;',
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' esac',
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' ;;',
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' esac',
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"done\n" );
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}
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sub balance_default_route( $$$$ ) {
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my ( $weight, $gateway, $interface, $realm ) = @_;
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$balance = 1;
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emit '';
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if ( $first_default_route ) {
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if ( $gateway ) {
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emit "DEFAULT_ROUTE=\"nexthop via $gateway dev $interface weight $weight $realm\"";
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} else {
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emit "DEFAULT_ROUTE=\"nexthop dev $interface weight $weight $realm\"";
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}
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$first_default_route = 0;
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} else {
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if ( $gateway ) {
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emit "DEFAULT_ROUTE=\"\$DEFAULT_ROUTE nexthop via $gateway dev $interface weight $weight $realm\"";
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} else {
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emit "DEFAULT_ROUTE=\"\$DEFAULT_ROUTE nexthop dev $interface weight $weight $realm\"";
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}
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}
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}
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sub add_a_provider( $$$$$$$$ ) {
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my ($table, $number, $mark, $duplicate, $interface, $gateway, $options, $copy) = @_;
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fatal_error "Duplicate provider ($table)" if $providers{$table};
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my $num = numeric_value $number;
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fatal_error "Invalid Provider number ($number)" unless defined $num;
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$number = $num;
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for my $providerref ( values %providers ) {
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fatal_error "Duplicate provider number ($number)" if $providerref->{number} == $number;
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}
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( $interface, my $address ) = split /:/, $interface;
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my $shared = 0;
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if ( defined $address ) {
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validate_address $address, 0;
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$shared = 1;
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require_capability 'REALM_MATCH', "Configuring multiple providers through one interface", "s";
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}
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fatal_error "Unknown Interface ($interface)" unless known_interface $interface;
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my $provider = chain_base $table;
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my $base = uc chain_base $interface;
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emit "#\n# Add Provider $table ($number)\n#";
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emit "if interface_is_usable $interface; then";
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push_indent;
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emit "qt ip -$family route flush table $number";
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emit "echo \"qt ip -$family route flush table $number\" >> \${VARDIR}/undo_routing";
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if ( $gateway eq 'detect' ) {
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fatal_error "'detect' is not allowed with USE_DEFAULT_RT=Yes" if $config{USE_DEFAULT_RT};
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fatal_error "Configuring multiple providers through one interface requires an explicit gateway" if $shared;
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$gateway = get_interface_gateway $interface;
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} elsif ( $gateway && $gateway ne '-' ) {
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validate_address $gateway, 0;
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} else {
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fatal_error "Configuring multiple providers through one interface requires a gateway" if $shared;
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$gateway = '';
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emit "run_ip route add default dev $interface table $number";
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}
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my $val = 0;
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if ( $mark ne '-' ) {
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$val = numeric_value $mark;
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fatal_error "Invalid Mark Value ($mark)" unless defined $val;
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verify_mark $mark;
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if ( $val < 256) {
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fatal_error "Invalid Mark Value ($mark) with HIGH_ROUTE_MARKS=Yes" if $config{HIGH_ROUTE_MARKS};
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} else {
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fatal_error "Invalid Mark Value ($mark) with HIGH_ROUTE_MARKS=No" if ! $config{HIGH_ROUTE_MARKS};
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}
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for my $providerref ( values %providers ) {
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fatal_error "Duplicate mark value ($mark)" if $providerref->{mark} == $val;
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}
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my $pref = 10000 + $number - 1;
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emit ( "qt ip -$family rule del fwmark $mark" ) if $config{DELETE_THEN_ADD};
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emit ( "run_ip rule add fwmark $mark pref $pref table $number",
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"echo \"qt ip -$family rule del fwmark $mark\" >> \${VARDIR}/undo_routing"
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);
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}
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my ( $loose, $track, $balance , $default_balance, $optional, $mtu ) = (0,0,0,$config{USE_DEFAULT_RT} ? 1 : 0,interface_is_optional( $interface ), '' );
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unless ( $options eq '-' ) {
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for my $option ( split_list $options, 'option' ) {
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if ( $option eq 'track' ) {
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$track = 1;
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} elsif ( $option =~ /^balance=(\d+)$/ ) {
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$balance = $1;
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} elsif ( $option eq 'balance' ) {
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$balance = 1;
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} elsif ( $option eq 'loose' ) {
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$loose = 1;
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$default_balance = 0;
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} elsif ( $option eq 'optional' ) {
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set_interface_option $interface, 'optional', 1;
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$optional = 1;
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} elsif ( $option =~ /^src=(.*)$/ ) {
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fatal_error "OPTION 'src' not allowed on shared interface" if $shared;
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$address = validate_address( $1 , 1 );
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} elsif ( $option =~ /^mtu=(\d+)$/ ) {
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$mtu = "mtu $1 ";
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} else {
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fatal_error "Invalid option ($option)";
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}
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}
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}
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$balance = $default_balance unless $balance;
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$providers{$table} = { provider => $table,
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number => $number ,
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mark => $val ,
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interface => $interface ,
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optional => $optional ,
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gateway => $gateway ,
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shared => $shared };
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if ( $track ) {
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fatal_error "The 'track' option requires a numeric value in the MARK column" if $mark eq '-';
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if ( $routemarked_interfaces{$interface} ) {
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fatal_error "Interface $interface is tracked through an earlier provider" if $routemarked_interfaces{$interface} > 1;
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fatal_error "Multiple providers through the same interface must their IP address specified in the INTERFACES" unless $shared;
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} else {
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$routemarked_interfaces{$interface} = $shared ? 1 : 2;
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push @routemarked_interfaces, $interface;
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}
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push @routemarked_providers, $providers{$table};
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}
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my $realm = '';
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if ( $shared ) {
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$providers{$table}{mac} = get_interface_mac( $gateway, $interface , $table );
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$realm = "realm $number";
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}
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if ( $duplicate ne '-' ) {
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fatal_error "The DUPLICATE column must be empty when USE_DEFAULT_RT=Yes" if $config{USE_DEFAULT_RT};
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if ( $copy eq '-' ) {
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copy_table ( $duplicate, $number, $realm );
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} else {
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if ( $copy eq 'none' ) {
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$copy = $interface;
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} else {
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$copy =~ tr/,/|/;
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$copy = "$interface|$copy";
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}
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copy_and_edit_table( $duplicate, $number ,$copy , $realm);
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}
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} elsif ( $copy ne '-' ) {
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fatal_error "The COPY column must be empty when USE_DEFAULT_RT=Yes" if $config{USE_DEFAULT_RT};
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fatal_error 'A non-empty COPY column requires that a routing table be specified in the DUPLICATE column';
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}
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if ( $gateway ) {
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$address = get_interface_address $interface unless $address;
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emit "run_ip route replace $gateway src $address dev $interface ${mtu}table $number $realm";
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emit "run_ip route add default via $gateway src $address dev $interface ${mtu}table $number $realm";
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}
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balance_default_route $balance , $gateway, $interface, $realm if $balance;
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if ( $loose ) {
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if ( $config{DELETE_THEN_ADD} ) {
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emit ( "\nfind_interface_addresses $interface | while read address; do",
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" qt ip $family rule del from $address",
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'done'
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);
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}
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} elsif ( $shared ) {
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emit "qt ip -$family rule del from $address" if $config{DELETE_THEN_ADD};
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emit( "run_ip rule add from $address pref 20000 table $number" ,
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"echo \"qt ip -$family rule del from $address\" >> \${VARDIR}/undo_routing" );
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} else {
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my $rulebase = 20000 + ( 256 * ( $number - 1 ) );
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emit "\nrulenum=0\n";
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emit ( "find_interface_addresses $interface | while read address; do" );
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emit ( " qt ip $family rule del from $address" ) if $config{DELETE_THEN_ADD};
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emit ( " run_ip rule add from \$address pref \$(( $rulebase + \$rulenum )) table $number",
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" echo \"qt ip -$family rule del from \$address\" >> \${VARDIR}/undo_routing",
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' rulenum=$(($rulenum + 1))',
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'done'
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);
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}
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emit qq(\nprogress_message " Provider $table ($number) Added"\n);
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emit ( "${base}_IS_UP=Yes" ) if $optional;
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pop_indent;
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emit 'else';
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if ( $optional ) {
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emit ( " error_message \"WARNING: Interface $interface is not configured -- Provider $table ($number) not Added\"",
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" ${base}_IS_UP=" );
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} else {
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emit( " fatal_error \"Interface $interface is not configured -- Provider $table ($number) Cannot be Added\"" );
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}
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emit "fi\n";
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}
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sub add_an_rtrule( $$$$ ) {
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my ( $source, $dest, $provider, $priority ) = @_;
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unless ( $providers{$provider} ) {
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my $found = 0;
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if ( "\L$provider" =~ /^(0x[a-f0-9]+|0[0-7]*|[0-9]*)$/ ) {
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my $provider_number = numeric_value $provider;
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for ( keys %providers ) {
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if ( $providers{$_}{number} == $provider_number ) {
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$provider = $_;
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$found = 1;
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last;
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}
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}
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}
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fatal_error "Unknown provider ($provider)" unless $found;
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}
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fatal_error "You must specify either the source or destination in a route_rules entry" if $source eq '-' && $dest eq '-';
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if ( $dest eq '-' ) {
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$dest = 'to ' . ALLIP;
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} else {
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validate_net( $dest, 0 );
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$dest = "to $dest";
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}
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if ( $source eq '-' ) {
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$source = 'from ' . ALLIP;
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} elsif ( $source =~ /:/ ) {
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( my $interface, $source , my $remainder ) = split( /:/, $source, 3 );
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fatal_error "Invalid SOURCE" if defined $remainder;
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validate_net ( $source, 0 );
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$source = "iif $interface from $source";
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} elsif ( $source =~ /\..*\..*/ ) {
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validate_net ( $source, 0 );
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$source = "from $source";
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} else {
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$source = "iif $source";
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}
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fatal_error "Invalid priority ($priority)" unless $priority && $priority =~ /^\d{1,5}$/;
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$priority = "priority $priority";
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emit ( "qt ip -$family rule del $source $dest $priority" ) if $config{DELETE_THEN_ADD};
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my ( $optional, $number ) = ( $providers{$provider}{optional} , $providers{$provider}{number} );
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if ( $optional ) {
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my $base = uc chain_base( $providers{$provider}{interface} );
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emit ( '', "if [ -n \$${base}_IS_UP ]; then" );
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push_indent;
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}
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emit ( "run_ip rule add $source $dest $priority table $number",
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"echo \"qt ip -$family rule del $source $dest $priority\" >> \${VARDIR}/undo_routing" );
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pop_indent, emit ( "fi\n" ) if $optional;
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progress_message " Routing rule \"$currentline\" $done";
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}
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#
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# This probably doesn't belong here but looking forward to the day when we get Shorewall out of the routing business,
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# it makes sense to keep all of the routing code together
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#
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sub setup_null_routing() {
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save_progress_message "Null Routing the RFC 1918 subnets";
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for ( rfc1918_networks ) {
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emit( "run_ip route replace unreachable $_" );
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emit( "echo \"qt ip -$family route del unreachable $_\" >> \${VARDIR}/undo_routing" );
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}
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}
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sub setup_providers() {
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my $providers = 0;
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my $fn = open_file 'providers';
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|
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while ( read_a_line ) {
|
|
unless ( $providers ) {
|
|
progress_message2 "$doing $fn ...";
|
|
|
|
require_capability( 'MANGLE_ENABLED' , 'a non-empty providers file' , 's' );
|
|
|
|
fatal_error "A non-empty providers file is not permitted with MANGLE_ENABLED=No" unless $config{MANGLE_ENABLED};
|
|
|
|
emit "\nif [ -z \"\$NOROUTES\" ]; then";
|
|
|
|
push_indent;
|
|
|
|
emit ( '#',
|
|
'# Undo any changes made since the last time that we [re]started -- this will not restore the default route',
|
|
'#',
|
|
'undo_routing' );
|
|
|
|
unless ( $config{KEEP_RT_TABLES} ) {
|
|
emit (
|
|
'#',
|
|
'# Save current routing table database so that it can be restored later',
|
|
'#',
|
|
'cp /etc/iproute2/rt_tables ${VARDIR}/' );
|
|
|
|
}
|
|
|
|
emit ( '#',
|
|
'# Capture the default route(s) if we don\'t have it (them) already.',
|
|
'#',
|
|
'[ -f ${VARDIR}/default_route ] || ip -' . $family . ' route list | grep -E \'^\s*(default |nexthop )\' > ${VARDIR}/default_route',
|
|
'#',
|
|
'# Initialize the file that holds \'undo\' commands',
|
|
'#',
|
|
'> ${VARDIR}/undo_routing' );
|
|
|
|
save_progress_message 'Adding Providers...';
|
|
|
|
emit 'DEFAULT_ROUTE=';
|
|
}
|
|
|
|
my ( $table, $number, $mark, $duplicate, $interface, $gateway, $options, $copy ) = split_line 6, 8, 'providers file';
|
|
|
|
add_a_provider( $table, $number, $mark, $duplicate, $interface, $gateway, $options, $copy );
|
|
|
|
push @providers, $table;
|
|
|
|
$providers++;
|
|
|
|
progress_message " Provider \"$currentline\" $done";
|
|
|
|
}
|
|
|
|
if ( $providers ) {
|
|
if ( $balance ) {
|
|
my $table = MAIN_TABLE;
|
|
|
|
if ( $config{USE_DEFAULT_RT} ) {
|
|
emit ( 'run_ip rule add from all table ' . MAIN_TABLE . ' pref 999',
|
|
"ip -$family rule del from all table " . MAIN_TABLE . ' pref 32766',
|
|
qq(echo "qt ip -$family rule add from all table ) . MAIN_TABLE . ' pref 32766" >> ${VARDIR}/undo_routing',
|
|
qq(echo "qt ip -$family rule del from all table ) . MAIN_TABLE . ' pref 999" >> ${VARDIR}/undo_routing',
|
|
'' );
|
|
$table = DEFAULT_TABLE;
|
|
}
|
|
|
|
emit ( 'if [ -n "$DEFAULT_ROUTE" ]; then' );
|
|
emit ( " run_ip route replace default scope global table $table \$DEFAULT_ROUTE" );
|
|
emit ( " qt ip -$family route del default table " . MAIN_TABLE ) if $config{USE_DEFAULT_RT};
|
|
emit ( " progress_message \"Default route '\$(echo \$DEFAULT_ROUTE | sed 's/\$\\s*//')' Added\"",
|
|
'else',
|
|
' error_message "WARNING: No Default route added (all \'balance\' providers are down)"',
|
|
' restore_default_route',
|
|
'fi',
|
|
'' );
|
|
} else {
|
|
emit ( '#',
|
|
'# We don\'t have any \'balance\' providers so we restore any default route that we\'ve saved',
|
|
'#',
|
|
'restore_default_route' );
|
|
}
|
|
|
|
unless ( $config{KEEP_RT_TABLES} ) {
|
|
emit( 'if [ -w /etc/iproute2/rt_tables ]; then',
|
|
' cat > /etc/iproute2/rt_tables <<EOF' );
|
|
|
|
push_indent;
|
|
|
|
emit_unindented join( "\n",
|
|
'#',
|
|
'# reserved values',
|
|
'#',
|
|
LOCAL_TABLE . "\tlocal",
|
|
MAIN_TABLE . "\tmain",
|
|
DEFAULT_TABLE . "\tdefault",
|
|
"0\tunspec",
|
|
'#',
|
|
'# local',
|
|
'#',
|
|
"EOF\n" );
|
|
|
|
emit "echocommand=\$(find_echo)\n";
|
|
|
|
for my $table ( @providers ) {
|
|
emit "\$echocommand \"$providers{$table}{number}\\t$table\" >> /etc/iproute2/rt_tables";
|
|
}
|
|
|
|
pop_indent;
|
|
|
|
emit "fi\n";
|
|
}
|
|
|
|
my $fn = open_file 'route_rules';
|
|
|
|
if ( $fn ) {
|
|
|
|
first_entry "$doing $fn...";
|
|
|
|
emit '';
|
|
|
|
while ( read_a_line ) {
|
|
|
|
my ( $source, $dest, $provider, $priority ) = split_line 4, 4, 'route_rules file';
|
|
|
|
add_an_rtrule( $source, $dest, $provider , $priority );
|
|
}
|
|
}
|
|
|
|
setup_null_routing if $config{NULL_ROUTE_RFC1918};
|
|
emit "\nrun_ip route flush cache";
|
|
pop_indent;
|
|
emit "fi\n";
|
|
|
|
setup_route_marking if @routemarked_interfaces;
|
|
} else {
|
|
emit "\nundo_routing";
|
|
emit 'restore_default_route';
|
|
if ( $config{NULL_ROUTE_RFC1918} ) {
|
|
emit "\nif [ -z \"\$NOROUTES\" ]; then";
|
|
|
|
push_indent;
|
|
|
|
emit ( '#',
|
|
'# Initialize the file that holds \'undo\' commands',
|
|
'#',
|
|
'> ${VARDIR}/undo_routing' );
|
|
setup_null_routing;
|
|
emit "\nrun_ip route flush cache";
|
|
|
|
pop_indent;
|
|
|
|
emit "fi\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
sub lookup_provider( $ ) {
|
|
my $provider = $_[0];
|
|
my $providerref = $providers{ $provider };
|
|
|
|
unless ( $providerref ) {
|
|
fatal_error "Unknown provider ($provider)" unless $provider =~ /^(0x[a-f0-9]+|0[0-7]*|[0-9]*)$/;
|
|
|
|
my $provider_number = numeric_value $provider;
|
|
|
|
for ( keys %providers ) {
|
|
if ( $providers{$_}{number} == $provider_number ) {
|
|
$providerref = $providers{$_};
|
|
last;
|
|
}
|
|
}
|
|
|
|
fatal_error "Unknown provider ($provider)" unless $providerref;
|
|
}
|
|
|
|
|
|
$providerref->{shared} ? $providerref->{number} : 0;
|
|
}
|
|
|
|
1;
|