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https://gitlab.com/shorewall/code.git
synced 2024-11-23 16:13:18 +01:00
Initial basic filter implementation.
Signed-off-by: Tom Eastep <teastep@shorewall.net>
This commit is contained in:
Tom Eastep
parent
44e0d48fc5
commit
9c4089fc99
@ -58,6 +58,7 @@ our @EXPORT = ( qw( ALLIPv4
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validate_address
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validate_net
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decompose_net
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decompose_net_u32
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compare_nets
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validate_host
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validate_range
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@ -303,6 +304,48 @@ sub decompose_net( $ ) {
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}
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#
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# This function returns an array of (mask, address) pairs. For IPv4, only one
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# pair is returned. For IPv6, one pair is returned for every 32 bits of the VLSM.
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#
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# For example, a /64 network will return two pairs; a /80 would return 3.
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#
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sub decompose_net_u32( $ ) {
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my ( $net, $vlsm ) = decompose_net( $_[0] );
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assert( wantarray );
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if ( $family == F_IPV4 ) {
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$vlsm = ( 0xffffffff << ( $vlsm-32 ) ) & 0xffffffff;
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return ( in_hex8( $vlsm ) , in_hex8( $net ) );
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}
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#
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# Split the address into 16-bit hex numbers
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#
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my @addr = split( ':', $net );
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#
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# Replace each element by its numeric value
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#
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no warnings;
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$_ = oct( '0x' . $_ ) for @addr;
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use warnings;
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my @result;
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while ( $vlsm >= 32 ) {
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push @result, 0xffffff;
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push @result, ( shift( @addr ) << 16 ) | shift( @addr );
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$vlsm -= 32;
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}
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if ( $vlsm ) {
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push @result, ( ( 0xffffffff << ( $vlsm-32 ) ) & 0xffffffff );
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push @result, ( ( $addr[0] << 16) | $addr[1] );
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}
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@result;
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}
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sub compare_nets( $$ ) {
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my ( @net1, @net2 );
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@ -2188,6 +2188,300 @@ sub process_tc_filter1( $$$$$$$$$ ) {
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}
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#
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# Handle an ipset name in the SOURCE or DEST columns of a filter
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#
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sub handle_ematch( $$ ) {
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my ( $setname, $option ) = @_;
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my $options = $option;
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require_capability 'BASIC_EMATCH', 'IPSets', '';
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if ( $setname =~ /^(.*)\[([1-6])\]$/ ) {
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$setname = $1;
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my $count = $2;
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$options .= ",$option" while --$count > 0;
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} elsif ( $setname =~ /^(.*)\[((?:src|dst)(?:,(?:src|dst))){0,5}\]$/ ) {
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$setname = $1;
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$options = $2 if supplied $2;
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my @options = split /,/, $options;
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if ( $config{IPSET_WARNINGS} ) {
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my %typemap = ( src => 'Source', dst => 'Destination' );
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warning_message( "The '$options[0]' ipset flag is used in a $typemap{$option} column" ), unless $options[0] eq $option;
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}
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}
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$setname =~ s/\+//;
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return "\\\n ipset\\($setname $options\\)";
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}
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#
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# Process a TC filter and generate a 'basic' filter -- allows ipsets.
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#
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sub process_tc_filter2( $$$$$$$$$ ) {
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my ( $devclass, $source, $dest , $proto, $portlist , $sportlist, $tos, $length, $priority ) = @_;
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my ($device, $class, $rest ) = split /:/, $devclass, 3;
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our $lastdevice;
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fatal_error "Invalid INTERFACE:CLASS ($devclass)" if defined $rest || ! ($device && $class );
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my ( $ip, $ip32, $lo ) = $family == F_IPV4 ? ('ip', 'ip', 2 ) : ('ipv6', 'ip6', 4 );
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my $devref;
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if ( $device =~ /^[\da-fA-F]+$/ && ! $tcdevices{$device} ) {
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( $device, $devref ) = dev_by_number( hex_value( $device ) );
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} else {
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( $device , $devref ) = dev_by_number( $device );
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}
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my ( $prio, $filterpri ) = ( undef, $devref->{filterpri} );
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if ( $priority eq '-' ) {
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$prio = ++$filterpri;
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fatal_error "Filter priority overflow" if $prio > 65535;
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} else {
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$prio = validate_filter_priority( $priority, 'filter' );
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$filterpri = $prio if $prio > $filterpri;
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}
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$devref->{filterpri} = $filterpri;
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my $devnum = in_hexp $devref->{number};
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my $tcref = $tcclasses{$device};
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my $filtersref = $devref->{filters};
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fatal_error "No Classes were defined for INTERFACE $device" unless $tcref;
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my $classnum = hex_value $class;
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fatal_error "Invalid CLASS ($class)" unless defined $classnum;
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$tcref = $tcref->{$classnum};
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fatal_error "Unknown CLASS ($devclass)" unless $tcref && $tcref->{occurs};
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fatal_error "Filters may not specify an occurring CLASS" if $tcref->{occurs} > 1;
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unless ( $tcref->{leaf} ) {
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warning_message "Filter specifying a non-leaf CLASS ($devnum:$class) ignored";
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return;
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}
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my $have_rule = 0;
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my $rule = "filter add dev $devref->{physical} protocol $ip parent $devnum:0 prio $prio basic match";
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if ( $tos ne '-' ) {
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my $tosval = $tosoptions{$tos};
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my $mask;
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$tosval = $tos unless $tosval;
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if ( $tosval =~ /^0x[0-9a-f]{2}$/ ) {
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$mask = '0xfc';
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} elsif ( $tosval =~ /^(0x[0-9a-f]{2})\/(0x[0-9a-f]{2})$/ ) {
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$tosval = $1;
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$mask = $2;
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} else {
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fatal_error "Invalid TOS ($tos)";
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}
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$rule .= ' and' if $have_rule;
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$rule .= "\\\n cmp\\( u16 at 1 mask $mask eq $tosval \\)";
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$have_rule = 1;
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}
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if ( $length ne '-' ) {
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my $len = numeric_value( $length ) || 0;
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my $mask = $validlengths{$len};
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fatal_error "Invalid LENGTH ($length)" unless $mask;
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$rule .= ' and' if $have_rule;
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$rule .="\\\n cmp\\(u16 at $lo mask $mask eq $len\\)";
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$have_rule = 1;
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}
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my $protonumber = 0;
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unless ( $proto eq '-' ) {
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$protonumber = resolve_proto $proto;
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fatal_error "Unknown PROTO ($proto)" unless defined $protonumber;
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if ( $protonumber ) {
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$rule .= 'and ' if $have_rule;
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$rule .= "\\\n match cmp\\( u8 at 6 mask 0xff eq $protonumber \\)";
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$have_rule = 1;
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}
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}
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if ( $portlist ne '-' || $sportlist ne '-' ) {
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fatal_error "Ports may not be specified without a PROTO" unless $protonumber;
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$rule .= ' and';
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if ( $portlist eq '-' ) {
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fatal_error "Only TCP, UDP and SCTP may specify SOURCE PORT"
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unless $protonumber == TCP || $protonumber == UDP || $protonumber == SCTP;
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my @sportlist;
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my $multiple;
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push @sportlist, expand_port_range( $protonumber, $_ ) for split_list( $sportlist, 'port list' );
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$rule .= "\\\n (" if $multiple = ( @sportlist > 1 );
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while ( @sportlist ) {
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my ( $sport, $smask ) = ( shift @sportlist, shift @sportlist );
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$rule .= "\\\n cmp( u16 at 0 layer 2 mask $smask eq $sport \\)";
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$rule .= ' or' if @sportlist;
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}
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$rule .= "\\\n \\)" if $multiple;
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} else {
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fatal_error "Only TCP, UDP, SCTP and ICMP may specify DEST PORT"
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unless $protonumber == TCP || $protonumber == UDP || $protonumber == SCTP || $protonumber == ICMP;
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if ( $protonumber == ICMP ) {
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fatal_error "ICMP not allowed with IPv6" unless $family == F_IPV4;
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fatal_error "SOURCE PORT(S) are not allowed with ICMP" if $sportlist ne '-';
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my @typelist = split_list( $portlist, 'icmp type' );
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$rule .= "\\\n (" if @typelist > 1;
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for my $type ( @typelist ) {
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my ( $icmptype , $icmpcode ) = split '/', validate_icmp( $type );
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$rule .= "\\\n cmp( u16 at 0 layer 2 mask 0xffff eq " . in_hex4( ( $icmptype << 8 ) | $icmpcode );
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$rule .= ' or' if @typelist > 1;
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}
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$rule .= "\\\n(" if @typelist > 1;
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} elsif ( $protonumber == IPv6_ICMP ) {
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fatal_error "IPv6 ICMP not allowed with IPv4" unless $family == F_IPV4;
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fatal_error "SOURCE PORT(S) are not allowed with IPv6 ICMP" if $sportlist ne '-';
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my @typelist = split_list( $portlist, 'icmp type' );
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$rule .= "\\\n (" if @typelist > 1;
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for my $type ( @typelist ) {
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my ( $icmptype , $icmpcode ) = split '/', validate_icmp6( $type );
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$rule .= "\\\n cmp( u16 at 0 layer 2 mask 0xffff eq " . in_hex4( ( $icmptype << 8 ) | $icmpcode );
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$rule .= ' or' if @typelist > 1;
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}
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$rule .= "\\\n(" if @typelist > 1;
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} else {
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my @portlist;
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my $multiple;
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push @portlist, expand_port_range( $protonumber, $_ ) for split_list( $portlist, 'port list' );
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$rule .= "\\\n (" if $multiple = ( @portlist > 1 );
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while ( @portlist ) {
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my ( $port, $mask ) = ( shift @portlist, shift @portlist );
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$rule .= "\\\n cmp( u16 at 2 layer 2 mask $mask eq $port \\)";
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$rule .= ' or' if @portlist;
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}
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$rule .= "\\\n \\)" if $multiple;
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$rule .= ' and';
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push @portlist, expand_port_range( $protonumber, $_ ) for split_list( $sportlist, 'port list' );
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$rule .= "\\\n (" if $multiple = ( @portlist > 1 );
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while ( @portlist ) {
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my ( $sport, $smask ) = ( shift @portlist, shift @portlist );
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$rule .= "\\\n cmp( u16 at 0 layer 2 mask $smask eq $sport \\)";
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$rule .= ' or' if @portlist;
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}
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$rule .= "\\\n \\)" if $multiple;
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}
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}
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}
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if ( $source ne '-' ) {
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$rule .= ' and' if $have_rule;
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if ( $source =~ /^\+/ ) {
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$rule = join( ' ', "\\\n ", handle_ematch( $source, 'src' ) );
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} else {
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my @parts = decompose_net_u32( $source );
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if ( $family == F_IPV4 ) {
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$rule .= join( ' ', "\\\n cmp\\( u32 at 12 mask ", in_hex8( $parts[0] ), 'eq' , in_hex8( $parts[1] ), "\\)" );
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} else {
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my $offset = 8;
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while ( @parts ) {
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$rule .= join( ' ', "\\\n cmp\\( u32 at $offset mask ", in_hex8( shift @parts ) , 'eq' , in_hex8( shift @parts ), "\\)" );
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$offset += 4;
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$rule .= ' and' if @parts;
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}
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}
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}
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$have_rule = 1;
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}
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if ( $dest ne '-' ) {
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$rule .= ' and' if $have_rule;
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if ( $dest =~ /^\+/ ) {
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$rule .= join( ' ', "\\\n ", handle_ematch( $dest, 'dst' ) );
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} else {
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$rule .= 'and ' if $have_rule;
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my @parts = decompose_net_u32( $dest );
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if ( $family == F_IPV4 ) {
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$rule .= join( ' ', "\\\n cmp\\( u32 at 12 mask ", in_hex8( $parts[0] ), 'eq' , in_hex8( $parts[1] ), "\\)" );
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} else {
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my $offset = 8;
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while ( @parts ) {
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$rule .= join( ' ', "\\\n cmp\\( u32 at $offset", in_hex8( shift @parts ), 'eq' , in_hex8( shift @parts ), "\\)" );
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$offset += 4;
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$rule .= ' and' if @parts;
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}
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}
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$have_rule = 1;
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}
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}
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if ( $have_rule ) {
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push @$filtersref, ( "\nrun_tc $rule\\" ,
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" flowid $devnum:$class" );
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emit '';
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if ( $family == F_IPV4 ) {
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progress_message " IPv4 TC Filter \"$currentline\" $done";
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} else {
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progress_message " IPv6 TC Filter \"$currentline\" $done";
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}
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} else {
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warning_message "Degenerate filter ignored";
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}
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}
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sub process_tc_filter() {
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my ( $devclass, $source, $dest , $protos, $portlist , $sportlist, $tos, $length, $priority )
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@ -2196,8 +2490,14 @@ sub process_tc_filter() {
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fatal_error 'CLASS must be specified' if $devclass eq '-';
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for my $proto ( split_list $protos, 'Protocol' ) {
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process_tc_filter1( $devclass, $source, $dest , $proto, $portlist , $sportlist, $tos, $length, $priority );
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if ( have_capability 'BASIC_EMATCH' ) {
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for my $proto ( split_list $protos, 'Protocol' ) {
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process_tc_filter2( $devclass, $source, $dest , $proto, $portlist , $sportlist, $tos, $length, $priority );
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}
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} else {
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for my $proto ( split_list $protos, 'Protocol' ) {
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process_tc_filter1( $devclass, $source, $dest , $proto, $portlist , $sportlist, $tos, $length, $priority );
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}
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}
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}
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