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86 lines
2.0 KiB
Plaintext
86 lines
2.0 KiB
Plaintext
#
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# Shorewall version 4 - Drop Smurfs Action
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#
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# /usr/share/shorewall/action.DropSmurfs
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#
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# Accepts a single optional parameter:
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#
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# - = Do not Audit
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# audit = Audit dropped packets.
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#
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#################################################################################
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FORMAT 2
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DEFAULTS -
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BEGIN PERL;
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use strict;
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use Shorewall::Config qw(:DEFAULT F_IPV4 F_IPV6);
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use Shorewall::Chains;
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use Shorewall::Rules;
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my ( $audit ) = get_action_params( 1 );
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my $chainref = get_action_chain;
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my ( $level, $tag ) = get_action_logging;
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my $target;
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if ( $level ne '-' || $audit ne '-' ) {
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my $logchainref = ensure_filter_chain newlogchain( $chainref->{table} ), 0;
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log_rule_limit( $level,
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$logchainref,
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$chainref->{name},
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'DROP',
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'',
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$tag,
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'add',
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'' );
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if ( supplied $audit ) {
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fatal_error "Invalid argument ($audit) to DropSmurfs" if $audit ne 'audit';
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require_capability 'AUDIT_TARGET', q(Passing 'audit' to the DropSmurfs action), 's';
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add_ijump( $logchainref, j => 'AUDIT --type DROP' );
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}
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add_ijump( $logchainref, j => 'DROP' );
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$target = $logchainref;
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} else {
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$target = 'DROP';
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}
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if ( have_capability( 'ADDRTYPE' ) ) {
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if ( $family == F_IPV4 ) {
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add_ijump $chainref , j => 'RETURN', s => '0.0.0.0'; ;
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} else {
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add_ijump $chainref , j => 'RETURN', s => '::';
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}
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add_ijump( $chainref, g => $target, addrtype => '--src-type BROADCAST' ) ;
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} else {
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if ( $family == F_IPV4 ) {
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add_commands $chainref, 'for address in $ALL_BCASTS; do';
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} else {
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add_commands $chainref, 'for address in $ALL_ACASTS; do';
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}
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incr_cmd_level $chainref;
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add_ijump( $chainref, g => $target, s => '$address' );
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decr_cmd_level $chainref;
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add_commands $chainref, 'done';
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}
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if ( $family == F_IPV4 ) {
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add_ijump( $chainref, g => $target, s => '224.0.0.0/4' );
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} else {
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add_ijump( $chainref, g => $target, s => IPv6_MULTICAST );
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}
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END PERL;
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