forked from extern/shorewall_code
cd97ccfd4e
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@5747 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
459 lines
13 KiB
Perl
459 lines
13 KiB
Perl
#
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# Shorewall-perl 3.9 -- /usr/share/shorewall-perl/Shorewall/Providers.pm
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#
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# This program is under GPL [http://www.gnu.org/copyleft/gpl.htm]
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#
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# (c) 2007 - 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., 675 Mass Ave, Cambridge, MA 02139, USA
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#
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#
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package Shorewall::Providers;
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require Exporter;
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use Shorewall::Common;
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use Shorewall::Config;
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use Shorewall::Zones;
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use Shorewall::Chains;
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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 = ( );
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our @VERSION = 1.00;
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use constant { LOCAL_NUMBER => 255,
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MAIN_NUMBER => 254,
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DEFAULT_NUMBER => 253,
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UNSPEC_NUMBER => 0
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};
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our %routemarked_interfaces;
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our @routemarked_interfaces;
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my $balance = 0;
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my $first_default_route = 1;
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my %providers = ( 'local' => { number => LOCAL_NUMBER , mark => 0 } ,
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main => { number => MAIN_NUMBER , mark => 0 } ,
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default => { number => DEFAULT_NUMBER , mark => 0 } ,
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unspec => { number => UNSPEC_NUMBER , mark => 0 } );
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my @providers;
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#
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# Set up marking for 'tracked' interfaces. Unline in Shorewall 3.x, we add these rules unconditionally, even if the associated interface isn't up.
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#
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sub setup_route_marking() {
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my $mask = $config{HIGH_ROUTE_MARKS} ? '0xFFFF' : '0xFF';
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my $mark_op = $config{HIGH_ROUTE_MARKS} ? '--or-mark' : '--set-mark';
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require_capability( 'CONNMARK_MATCH' , 'the provider \'track\' option' );
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require_capability( 'CONNMARK' , 'the provider \'track\' option' );
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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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while ( my ( $interface, $mark ) = ( each %routemarked_interfaces ) ) {
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add_rule $mangle_table->{PREROUTING} , "-i $interface -m mark --mark 0/$mask -j routemark";
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add_rule $chainref, " -i $interface -j MARK $mark_op $mark";
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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 setup_providers() {
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my $fn = find_file 'providers';
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my $providers = 0;
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sub copy_table( $$ ) {
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my ( $duplicate, $number ) = @_;
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emitj( "ip route show table $duplicate | while read net route; do",
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' case $net in',
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' default|nexthop)',
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' ;;',
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' *)',
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" run_ip route add table $number \$net \$route",
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' ;;',
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' esac',
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"done\n"
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);
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}
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sub copy_and_edit_table( $$$ ) {
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my ( $duplicate, $number, $copy ) = @_;
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my $match = $copy;
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$match =~ s/ /\|/g;
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emitj ( "ip route show table $duplicate | while read net route; do",
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' 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",
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' case $(find_device $route) in',
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" $match)",
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" run_ip route add table $number \$net \$route",
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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( $$$ ) {
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my ( $weight, $gateway, $interface ) = @_;
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$balance = 1;
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emit '';
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if ( $first_default_route ) {
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if ( $gateway ) {
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emit "DEFAULT_ROUTE=\"nexthop via $gateway dev $interface weight $weight\"";
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} else {
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emit "DEFAULT_ROUTE=\"nexthop dev $interface weight $weight\"";
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}
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$first_default_route = 0;
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} else {
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if ( $gateway ) {
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emit "DEFAULT_ROUTE=\"\$DEFAULT_ROUTE nexthop via $gateway dev $interface weight $weight\"";
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} else {
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emit "DEFAULT_ROUTE=\"\$DEFAULT_ROUTE nexthop dev $interface weight $weight\"";
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}
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}
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}
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sub add_a_provider( $$$$$$$$ ) {
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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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for my $provider ( keys %providers ) {
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fatal_error "Duplicate provider number ( $number )" if $providers{$provider}{number} == $number;
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}
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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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my $iface = chain_base $interface;
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emit "${iface}_up=Yes";
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emit "qt ip route flush table $number";
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emit "echo \"qt ip route flush table $number\" >> \${VARDIR}/undo_routing";
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$duplicate = '-' unless $duplicate;
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$copy = '-' unless $copy;
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if ( $duplicate ne '-' ) {
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if ( $copy ne '-' ) {
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if ( $copy eq 'none' ) {
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$copy = $interface;
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} else {
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my @c = ( split /,/, $copy );
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$copy = "@c";
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}
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copy_and_edit_table( $duplicate, $number ,$copy );
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} else {
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copy_table ( $duplicate, $number );
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}
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} else {
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fatal_error 'A non-empty COPY column requires that a routing table be specified in the DUPLICATE column' if $copy ne '-';
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}
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$gateway = '-' unless $gateway;
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if ( $gateway eq 'detect' ) {
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emitj ( "gateway=\$(detect_gateway $interface)\n",
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'if [ -n "$gateway" ]; then',
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" run_ip route replace \$gateway src \$(find_first_interface_address $interface) dev $interface table $number",
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" run_ip route add default via \$gateway dev $interface table $number",
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'else',
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" fatal_error \"Unable to detect the gateway through interface $interface\"",
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"fi\n" );
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} elsif ( $gateway && $gateway ne '-' ) {
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emit "run_ip route replace $gateway src \$(find_first_interface_address $interface) dev $interface table $number";
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emit "run_ip route add default via $gateway dev $interface table $number";
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} else {
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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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$mark = '-' unless $mark;
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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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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 $provider ( keys %providers ) {
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my $num = $providers{$provider}{mark};
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fatal_error "Duplicate mark value ( $mark )" if $num == $val;
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}
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my $pref = 10000 + $val;
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emitj( "qt ip rule del fwmark $mark",
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"run_ip rule add fwmark $mark pref $pref table $number",
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"echo \"qt ip rule del fwmark $mark\" >> \${VARDIR}/undo_routing"
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);
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}
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$providers{$table} = {};
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$providers{$table}{number} = $number;
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$providers{$table}{mark} = $val;
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my ( $loose, $optional ) = (0,0);
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unless ( $options eq '-' ) {
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for my $option ( split /,/, $options ) {
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if ( $option eq 'track' ) {
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fatal_error "Interface $interface is tracked through an earlier provider" if $routemarked_interfaces{$interface};
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fatal_error "The 'track' option requires a numeric value in the MARK column - Provider \"$line\"" if $mark eq '-';
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$routemarked_interfaces{$interface} = $mark;
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push @routemarked_interfaces, $interface;
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} elsif ( $option =~ /^balance=(\d+)/ ) {
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balance_default_route $1 , $gateway, $interface;
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} elsif ( $option eq 'balance' ) {
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balance_default_route 1 , $gateway, $interface;
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} elsif ( $option eq 'loose' ) {
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$loose = 1;
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} elsif ( $option eq 'optional' ) {
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$optional = 1;
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} else {
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fatal_error "Invalid option ($option) in provider \"$line\"";
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}
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}
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}
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if ( $loose ) {
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my $rulebase = 20000 + ( 256 * ( $number - 1 ) );
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emit "\nrulenum=0\n";
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emitj ( "find_interface_addresses $interface | while read address; do",
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' qt ip rule del from $address',
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" run_ip rule add from \$address pref \$(( $rulebase + \$rulenum )) table $number",
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" echo \"qt ip 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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} else {
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emitj( "\nfind_interface_addresses $interface | while read address; do",
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' qt ip rule del from $address',
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'done'
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);
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}
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emit "\nprogress_message \" Provider $table ($number) Added\"\n";
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pop_indent;
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emit 'else';
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if ( $optional ) {
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emitj( " error_message \"WARNING: Interface $interface is not configured -- Provider $table ($number) not Added\"",
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" ${iface}_up="
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);
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} else {
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emit " fatal_error \"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 my $provider ( keys %providers ) {
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if ( $providers{$provider}{number} == $provider_number ) {
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$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 $provider in route rule \"$line\"" unless $found;
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}
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$source = '-' unless $source;
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$dest = '-' unless $dest;
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fatal_error "You must specify either the source or destination in an rt rule: \"$line\"" if $source eq '-' && $dest eq '-';
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$dest = $dest eq '-' ? '' : "to $dest";
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if ( $source eq '-' ) {
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$source = '';
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} elsif ( $source =~ /:/ ) {
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( my $interface, $source ) = split /:/, $source;
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$source = "iif $interface from $source";
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} elsif ( $source =~ /\..*\..*/ ) {
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$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) in rule \"$line\"" unless $priority && $priority =~ /^\d{1,5}$/;
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$priority = "priority $priority";
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emitj( "qt ip rule del $source $dest $priority",
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"run_ip rule add $source $dest $priority table $provider",
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"echo \"qt ip rule del $source $dest $priority\" >> \${VARDIR}/undo_routing"
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);
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progress_message " Routing rule \"$line\" $done";
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}
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#
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# Setup_Providers() Starts Here....
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#
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open_file $fn;
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while ( read_a_line ) {
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unless ( $providers ) {
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progress_message2 "$doing $fn ...";
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require_capability( 'MANGLE_ENABLED' , 'a non-empty providers file' );
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emit "\nif [ -z \"\$NOROUTES\" ]; then";
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push_indent;
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emitj ( '#',
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'# Undo any changes made since the last time that we [re]started -- this will not restore the default route',
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'#',
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'undo_routing',
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'#',
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'# Save current routing table database so that it can be restored later',
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'#',
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'cp /etc/iproute2/rt_tables ${VARDIR}/',
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'#',
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'# Capture the default route(s) if we don\'t have it (them) already.',
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'#',
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'[ -f ${VARDIR}/default_route ] || ip route ls | grep -E \'^\s*(default |nexthop )\' > ${VARDIR}/default_route',
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'#',
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'# Initialize the file that holds \'undo\' commands',
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'#',
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'> ${VARDIR}/undo_routing' );
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save_progress_message 'Adding Providers...';
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emit 'DEFAULT_ROUTE=';
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}
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my ( $table, $number, $mark, $duplicate, $interface, $gateway, $options, $copy ) = split_line 8, 'providers file';
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add_a_provider( $table, $number, $mark, $duplicate, $interface, $gateway, $options, $copy );
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push @providers, $table;
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$providers++;
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progress_message " Provider \"$line\" $done";
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}
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if ( $providers ) {
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if ( $balance ) {
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emitj ( 'if [ -n "$DEFAULT_ROUTE" ]; then',
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' run_ip route replace default scope global $DEFAULT_ROUTE',
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" progress_message \"Default route '\$(echo \$DEFAULT_ROUTE | sed 's/\$\\s*//')' Added\"",
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'else',
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' error_message "WARNING: No Default route added (all \'balance\' providers are down)"',
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' restore_default_route',
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'fi',
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'' );
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} else {
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emitj( '#',
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'# We don\'t have any \'balance\' providers so we restore any default route that we\'ve saved',
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'#',
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'restore_default_route' );
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}
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emit 'cat > /etc/iproute2/rt_tables <<EOF';
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emit_unindented join( "\n",
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'#',
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'# reserved values',
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'#',
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"255\tlocal",
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"254\tmain",
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"253\tdefault",
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"0\tunspec",
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'#',
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'# local',
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'#',
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"EOF\n" );
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emit "echocommand=\$(find_echo)\n";
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for my $table ( @providers ) {
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emit "\$echocommand \"$providers{$table}{number}\\t$table\" >> /etc/iproute2/rt_tables";
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}
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my $fn = find_file 'route_rules';
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if ( -f $fn ) {
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progress_message2 "$doing $fn...";
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emit '';
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open_file $fn;
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while ( read_a_line ) {
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my ( $source, $dest, $provider, $priority ) = split_line 4, 'route_rules file';
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add_an_rtrule( $source, $dest, $provider , $priority );
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}
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}
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emit "\nrun_ip route flush cache";
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pop_indent;
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emit "fi\n";
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setup_route_marking if @routemarked_interfaces;
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} else {
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emit "\nundo_routing";
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emit 'restore_default_route';
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}
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}
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1;
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