shorewall_code/Shorewall/action.TCPFlags

#
# Shorewall version 4 - Drop TCPFlags Action
#
# /usr/share/shorewall/action.TCPFlags
#
#   Accepts a single optional parameter:
#
#          -     = Do not Audit
#          audit = Audit dropped packets.
#
#################################################################################
?FORMAT 2

DEFAULTS -

?BEGIN PERL;
use strict;
use Shorewall::Config qw(:DEFAULT F_IPV4 F_IPV6);
use Shorewall::Chains;
use Shorewall::Rules;

my $action = 'DROP';

my ( $audit ) = get_action_params( 1 );

if ( supplied $audit ) {
     fatal_error "Invalid parameter ($audit) to action TCPFlags" if $audit ne 'audit';
     $action = "A_DROP";
}    

perl_action_tcp_helper( $action, '-p tcp --tcp-flags ALL FIN,URG,PSH' );
perl_action_tcp_helper( $action, '-p tcp --tcp-flags ALL NONE' );
perl_action_tcp_helper( $action, '-p tcp --tcp-flags SYN,RST SYN,RST' );
perl_action_tcp_helper( $action, '-p tcp --tcp-flags SYN,FIN SYN,FIN' );
perl_action_tcp_helper( $action, '-p tcp --syn --sport 0' );

?END PERL;