diff --git a/Shorewall/action.Broadcast b/Shorewall/action.Broadcast new file mode 100644 index 000000000..8c85211c5 --- /dev/null +++ b/Shorewall/action.Broadcast @@ -0,0 +1,81 @@ +# +# Shorewall 4 - Broadcast Action +# +# /usr/share/shorewall/action.Broadcast +# +# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt] +# +# (c) 2011 - Tom Eastep (teastep@shorewall.net) +# +# Complete documentation is available at http://shorewall.net +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of Version 2 of the GNU General Public License +# as published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +# +# Broadcast[([|-[,{audit|-}])] +# +# Default action is DROP +# +########################################################################################## +FORMAT 2 + +DEFAULTS DROP,- + +BEGIN PERL; + +use Shorewall::IPAddrs; +use Shorewall::Config; +use Shorewall::Chains; + +my $chainref = get_action_chain; +my ( $action, $audit ) = get_action_params( 2 ); +my ( $level, $tag ) = get_action_logging; +my $target = require_audit ( $action , $audit ); + +fatal_error "Invalid parameter to action Broadcast" if supplied $audit && $audit ne 'audit'; + +if ( have_capability( 'ADDRTYPE' ) ) { + if ( $level ne '' ) { + log_rule_limit $level, $chainref, 'dropBcast' , $action, '', $tag, 'add', ' -m addrtype --dst-type BROADCAST '; + log_rule_limit $level, $chainref, 'dropBcast' , $action, '', $tag, 'add', ' -m addrtype --dst-type MULTICAST '; + log_rule_limit $level, $chainref, 'dropBcast' , $action, '', $tag, 'add', ' -m addrtype --dst-type ANYCAST '; + } + + add_jump $chainref, $target, 0, "-m addrtype --dst-type BROADCAST "; + add_jump $chainref, $target, 0, "-m addrtype --dst-type MULTICAST "; + add_jump $chainref, $target, 0, "-m addrtype --dst-type ANYCAST "; +} else { + if ( $family == F_IPV4 ) { + add_commands $chainref, 'for address in $ALL_BCASTS; do'; + } else { + add_commands $chainref, 'for address in $ALL_BCASTS; do'; + } + + incr_cmd_level $chainref; + log_rule_limit $level, $chainref, 'Broadcast' , $action, '', $tag, 'add', ' -d $address ' if $level ne ''; + add_jump $chainref, $target, 0, "-d \$address "; + decr_cmd_level $chainref; + add_commands $chainref, 'done'; + + if ( $family == F_IPV4 ) { + log_rule_limit $level, $chainref, 'Broadcast' , $action, '', $tag, 'add', ' -d 224.0.0.0/4 ' if $level ne ''; + add_jump $chainref, $target, 0, '-d 224.0.0.0/4 '; + } else { + log_rule_limit( $level, $chainref, 'Broadcast' , $action, '', $tag, 'add', join( ' ', '-d', IPv6_MULTICAST . ' ' ) ) if $level ne ''; + add_jump $chainref, $target, 0, join( ' ', '-d', IPv6_MULTICAST . ' ' ); + } +} + +1; + +END PERL; diff --git a/Shorewall/action.Drop b/Shorewall/action.Drop index dcc91ced2..961144e48 100644 --- a/Shorewall/action.Drop +++ b/Shorewall/action.Drop @@ -70,7 +70,7 @@ Auth($2) # # Don't log broadcasts # -dropBcast($1) +Broadcast(DROP,$1) # # ACCEPT critical ICMP types # diff --git a/Shorewall/action.Reject b/Shorewall/action.Reject index 40b9212f9..3c4fc8be8 100644 --- a/Shorewall/action.Reject +++ b/Shorewall/action.Reject @@ -67,7 +67,7 @@ Auth($2) # Drop Broadcasts so they don't clutter up the log # (broadcasts must *not* be rejected). # -dropBcast($1) +Broadcast(DROP,$1) # # ACCEPT critical ICMP types # diff --git a/Shorewall/actions.std b/Shorewall/actions.std index 029d44c18..6a9ad9ced 100644 --- a/Shorewall/actions.std +++ b/Shorewall/actions.std @@ -35,5 +35,6 @@ #ACTION A_Drop # Audited Default Action for DROP policy A_Reject # Audited Default action for REJECT policy +Broadcast # Handles Broadcast/Multicast/Anycast Drop # Default Action for DROP policy Reject # Default Action for REJECT policy