X-Git-Url: https://git.proxmox.com/?p=pve-firewall.git;a=blobdiff_plain;f=src%2FPVE%2FFirewall.pm;h=c34216758acfffdcd020c707521ac6bd0b26a468;hp=92b02aae5f07290b364da2711c9c52d2f1aa493d;hb=9388a8f47a6db83a8a1f8f2b5852b6792fffa0f4;hpb=40af93c4067341115877fc082a900be215122f0a

diff --git a/src/PVE/Firewall.pm b/src/PVE/Firewall.pm
index 92b02aa..c342167 100644
--- a/src/PVE/Firewall.pm
+++ b/src/PVE/Firewall.pm
@@ -2,27 +2,28 @@ package PVE::Firewall;
 
 use warnings;
 use strict;
-use POSIX;
-use Data::Dumper;
+
 use Digest::SHA;
-use Socket qw(AF_INET6 inet_ntop inet_pton);
-use PVE::INotify;
-use PVE::Exception qw(raise raise_param_exc);
-use PVE::JSONSchema qw(register_standard_option get_standard_option);
-use PVE::Cluster;
-use PVE::ProcFSTools;
-use PVE::Tools qw($IPV4RE $IPV6RE);
-use PVE::Network;
-use PVE::SafeSyslog;
+use Encode;
 use File::Basename;
 use File::Path;
 use IO::File;
 use Net::IP;
-use PVE::Tools qw(run_command lock_file dir_glob_foreach);
-use Encode;
+use POSIX;
+use Socket qw(AF_INET AF_INET6 inet_ntop inet_pton);
 use Storable qw(dclone);
 
-my $hostfw_conf_filename = "/etc/pve/local/host.fw";
+use PVE::Cluster;
+use PVE::Corosync;
+use PVE::Exception qw(raise raise_param_exc);
+use PVE::INotify;
+use PVE::JSONSchema qw(register_standard_option get_standard_option);
+use PVE::Network;
+use PVE::ProcFSTools;
+use PVE::SafeSyslog;
+use PVE::Tools qw($IPV4RE $IPV6RE);
+use PVE::Tools qw(run_command lock_file dir_glob_foreach);
+
 my $pvefw_conf_dir = "/etc/pve/firewall";
 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
 
@@ -41,7 +42,6 @@ eval {
     $have_lxc = 1;
 };
 
-
 my $pve_fw_status_dir = "/var/lib/pve-firewall";
 
 mkdir $pve_fw_status_dir; # make sure this exists
@@ -127,6 +127,7 @@ eval  {
 };
 
 my $nodename = PVE::INotify::nodename();
+my $hostfw_conf_filename = "/etc/pve/nodes/$nodename/host.fw";
 
 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
 
@@ -213,7 +214,10 @@ my $pve_fw_macros = {
     ],
     'Ceph' => [
         "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
+	# Legacy port for protocol v1
         { action => 'PARAM', proto => 'tcp', dport => '6789' },
+	# New port for protocol v2
+        { action => 'PARAM', proto => 'tcp', dport => '3300' },
         { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
     ],
     'CVS' => [
@@ -390,6 +394,10 @@ my $pve_fw_macros = {
 	{ action => 'PARAM', proto => 'udp', dport => '5632' },
 	{ action => 'PARAM', proto => 'tcp', dport => '5631' },
     ],
+    'PMG' => [
+	"Proxmox Mail Gateway web interface",
+	{ action => 'PARAM', proto => 'tcp', dport => '8006' },
+    ],
     'POP3' => [
 	"POP3 traffic",
 	{ action => 'PARAM', proto => 'tcp', dport => '110' },
@@ -666,14 +674,10 @@ $pve_std_chains_conf->{6} = {
 	#{ action => 'DROP', dest => '224.0.0.0/4' },
     ],
     'PVEFW-reject' => [
-	# same as shorewall 'reject'
-	#{ action => 'DROP', dsttype => 'BROADCAST' },
-	#{ action => 'DROP', source => '224.0.0.0/4' },
 	{ action => 'DROP', proto => 'icmpv6' },
 	{ match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
-	#"-p udp -j REJECT --reject-with icmp-port-unreachable",
-	#"-p icmp -j REJECT --reject-with icmp-host-unreachable",
-	#"-j REJECT --reject-with icmp-host-prohibited",
+	{ match => '-p udp', target => '-j REJECT --reject-with icmp6-port-unreachable' },
+	{ target => '-j REJECT --reject-with icmp6-adm-prohibited' },
     ],
     'PVEFW-Drop' => [
 	# same as shorewall 'Drop', which is equal to DROP,
@@ -978,8 +982,8 @@ sub local_network {
 }
 
 # ipset names are limited to 31 characters,
-# and we use '-v4' or '-v6' to indicate IP versions, 
-# and we use '_swap' suffix for atomic update, 
+# and we use '-v4' or '-v6' to indicate IP versions,
+# and we use '_swap' suffix for atomic update,
 # for example PVEFW-${VMID}-${ipset_name}_swap
 
 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
@@ -1256,23 +1260,35 @@ our $host_option_properties = {
     tcpflags => {
 	description => "Filter illegal combinations of TCP flags.",
 	type => 'boolean',
+	default => 0,
 	optional => 1,
     },
     nf_conntrack_max => {
 	description => "Maximum number of tracked connections.",
 	type => 'integer',
 	optional => 1,
+	default => 262144,
 	minimum => 32768,
     },
     nf_conntrack_tcp_timeout_established => {
 	description => "Conntrack established timeout.",
 	type => 'integer',
 	optional => 1,
+	default => 432000,
 	minimum => 7875,
     },
+    nf_conntrack_tcp_timeout_syn_recv => {
+	description => "Conntrack syn recv timeout.",
+	type => 'integer',
+	optional => 1,
+	default => 60,
+	minimum => 30,
+	maximum => 60,
+    },
     ndp => {
-	description => "Enable NDP.",
+	description => "Enable NDP (Neighbor Discovery Protocol).",
 	type => 'boolean',
+	default => 0,
 	optional => 1,
     },
     nf_conntrack_allow_invalid => {
@@ -1281,6 +1297,24 @@ our $host_option_properties = {
 	default => 0,
 	optional => 1,
     },
+    protection_synflood => {
+	description => "Enable synflood protection",
+	type => 'boolean',
+	default => 0,
+	optional => 1,
+    },
+    protection_synflood_rate => {
+	description => "Synflood protection rate syn/sec by ip src.",
+	type => 'integer',
+	optional => 1,
+	default => 200,
+    },
+    protection_synflood_burst => {
+	description => "Synflood protection rate burst by ip src.",
+	type => 'integer',
+	optional => 1,
+	default => 1000,
+    },
     log_nf_conntrack => {
 	description => "Enable logging of conntrack information.",
 	type => 'boolean',
@@ -1293,21 +1327,25 @@ our $vm_option_properties = {
     enable => {
 	description => "Enable/disable firewall rules.",
 	type => 'boolean',
+	default => 0,
 	optional => 1,
     },
     macfilter => {
 	description => "Enable/disable MAC address filter.",
 	type => 'boolean',
+	default => 0,
 	optional => 1,
     },
     dhcp => {
 	description => "Enable DHCP.",
 	type => 'boolean',
+	default => 0,
 	optional => 1,
     },
     ndp => {
-	description => "Enable NDP.",
+	description => "Enable NDP (Neighbor Discovery Protocol).",
 	type => 'boolean',
+	default => 0,
 	optional => 1,
     },
     radv => {
@@ -1638,7 +1676,7 @@ sub verify_rule {
     }
 
     if ($rule->{source}) {
-	eval { 
+	eval {
 	    my $source_ipversion = parse_address_list($rule->{source});
 	    &$set_ip_version($source_ipversion);
 	};
@@ -1647,8 +1685,8 @@ sub verify_rule {
     }
 
     if ($rule->{dest}) {
-	eval { 
-	    my $dest_ipversion = parse_address_list($rule->{dest}); 
+	eval {
+	    my $dest_ipversion = parse_address_list($rule->{dest});
 	    &$set_ip_version($dest_ipversion);
 	};
 	&$add_error('dest', $@) if $@;
@@ -1749,33 +1787,36 @@ sub enable_bridge_firewall {
 }
 
 sub iptables_restore_cmdlist {
-    my ($cmdlist) = @_;
+    my ($cmdlist, $table) = @_;
 
-    run_command("/sbin/iptables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
+    $table = 'filter' if !$table;
+    run_command(['iptables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
 }
 
 sub ip6tables_restore_cmdlist {
-    my ($cmdlist) = @_;
+    my ($cmdlist, $table) = @_;
 
-    run_command("/sbin/ip6tables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
+    $table = 'filter' if !$table;
+    run_command(['ip6tables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
 }
 
 sub ipset_restore_cmdlist {
     my ($cmdlist) = @_;
 
-    run_command("/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
+    run_command(['ipset', 'restore'], input => $cmdlist, errmsg => "ipset_restore_cmdlist");
 }
 
 sub ebtables_restore_cmdlist {
     my ($cmdlist) = @_;
 
-    run_command("/sbin/ebtables-restore", input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
+    run_command(['ebtables-restore'], input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
 }
 
 sub iptables_get_chains {
-    my ($iptablescmd) = @_;
+    my ($iptablescmd, $t) = @_;
 
     $iptablescmd = "iptables" if !$iptablescmd;
+    $t = 'filter' if !$t;
 
     my $res = {};
 
@@ -1810,7 +1851,7 @@ sub iptables_get_chains {
 	    return;
 	}
 
-	return if $table ne 'filter';
+	return if $table ne $t;
 
 	if ($line =~ m/^:(\S+)\s/) {
 	    my $chain = $1;
@@ -1820,7 +1861,7 @@ sub iptables_get_chains {
 	    my ($chain, $sig) = ($1, $2);
 	    return if !&$is_pvefw_chain($chain);
 	    $res->{$chain} = $sig;
-	} elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
+	} elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD|PREROUTING)\s+-j\s+PVEFW-\1$/) {
 	    $hooks->{$1} = 1;
 	} else {
 	    # simply ignore the rest
@@ -1828,7 +1869,7 @@ sub iptables_get_chains {
 	}
     };
 
-    run_command("/sbin/$iptablescmd-save", outfunc => $parser);
+    run_command(["$iptablescmd-save"], outfunc => $parser);
 
     return wantarray ? ($res, $hooks) : $res;
 }
@@ -1872,7 +1913,7 @@ sub ipset_get_chains {
 	}
     };
 
-    run_command("/sbin/ipset save", outfunc => $parser);
+    run_command(['ipset', 'save'], outfunc => $parser);
 
     # compute digest for each chain
     foreach my $chain (keys %$chains) {
@@ -1903,7 +1944,7 @@ sub ebtables_get_chains {
 	}
     };
 
-    run_command("/sbin/ebtables-save", outfunc => $parser);
+    run_command(['ebtables-save'], outfunc => $parser);
     # compute digest for each chain and store rules as well
     foreach my $chain (keys %$chains) {
 	$res->{$chain}->{rules} = $chains->{$chain};
@@ -2223,7 +2264,7 @@ sub ruleset_create_vm_chain {
     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
 	if ($ipversion == 4) {
 	    if ($direction eq 'OUT') {
-		ruleset_generate_rule($ruleset, $chain, $ipversion, 
+		ruleset_generate_rule($ruleset, $chain, $ipversion,
 				      { action => 'PVEFW-SET-ACCEPT-MARK',
 					proto => 'udp', sport => 68, dport => 67 });
 	    } else {
@@ -2363,10 +2404,10 @@ sub generate_tap_rules_direction {
     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
 	if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
 
-    # create chain with mac and ip filter
-    ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
-
     if ($options->{enable}) {
+	# create chain with mac and ip filter
+	ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
+
 	ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion, $vmid);
 
 	ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
@@ -2391,21 +2432,40 @@ sub generate_tap_rules_direction {
     # plug the tap chain to bridge chain
     if ($direction eq 'IN') {
 	ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
-			"-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain", $loglevel, 'FWBR-IN: ', $vmid);
+			"-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
     } else {
 	ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
-			"-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain", $loglevel, 'FWBR-OUT: ', $vmid);
+			"-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
     }
 }
 
 sub enable_host_firewall {
-    my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion) = @_;
+    my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf) = @_;
 
     my $options = $hostfw_conf->{options};
     my $cluster_options = $cluster_conf->{options};
     my $rules = $hostfw_conf->{rules};
     my $cluster_rules = $cluster_conf->{rules};
 
+    # corosync preparation
+    my $corosync_rule = "-p udp --dport 5404:5405";
+    my $corosync_local_addresses = {};
+    my $multicast_enabled;
+    my $local_hostname = PVE::INotify::nodename();
+    if (defined($corosync_conf)) {
+	PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
+	    my ($node_name, $node_ip, $node_ipversion, $key) = @_;
+
+	    if ($node_name eq $local_hostname) {
+		$corosync_local_addresses->{$key} = $node_ip;
+	    }
+	});
+
+	# allow multicast only if enabled in config
+	my $corosync_transport = $corosync_conf->{main}->{totem}->{transport};
+	$multicast_enabled = defined($corosync_transport) && $corosync_transport eq 'udp';
+    }
+
     # host inbound firewall
     my $chain = "PVEFW-HOST-IN";
     ruleset_create_chain($ruleset, $chain);
@@ -2431,6 +2491,7 @@ sub enable_host_firewall {
 	$rule->{iface_in} = $rule->{iface} if $rule->{iface};
 
 	eval {
+	    $rule->{logmsg} = "$rule->{action}: ";
 	    if ($rule->{type} eq 'group') {
 		ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
 	    } elsif ($rule->{type} eq 'in') {
@@ -2449,15 +2510,22 @@ sub enable_host_firewall {
     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
+    ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 60000:60050", "-j $accept_action");  # Migration
 
-    my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
-    my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
+    # corosync inbound rules
+    if (defined($corosync_conf)) {
+	ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
+	    if $multicast_enabled;
 
-    # corosync
-    if ($localnet && ($ipversion == $localnet_ver)) {
-	my $corosync_rule = "-p udp --dport 5404:5405";
-	ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule", "-j $accept_action");
-	ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
+	PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
+	    my ($node_name, $node_ip, $node_ipversion, $key) = @_;
+	    my $destination = $corosync_local_addresses->{$key};
+
+	    if ($node_name ne $local_hostname && defined($destination)) {
+		# accept only traffic on same ring
+		ruleset_addrule($ruleset, $chain, "-d $destination -s $node_ip $corosync_rule", "-j $accept_action");
+	    }
+	});
     }
 
     # implement input policy
@@ -2500,15 +2568,30 @@ sub enable_host_firewall {
     }
 
     # allow standard traffic on cluster network
+    my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
+    my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
+
     if ($localnet && ($ipversion == $localnet_ver)) {
 	ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
 	ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
 	ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
 	ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
+    }
+
+    # corosync outbound rules
+    if (defined($corosync_conf)) {
+	ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
+	    if $multicast_enabled;
 
-	my $corosync_rule = "-p udp --dport 5404:5405";
-	ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule", "-j $accept_action");
-	ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
+	PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
+	    my ($node_name, $node_ip, $node_ipversion, $key) = @_;
+	    my $source = $corosync_local_addresses->{$key};
+
+	    if ($node_name ne $local_hostname && defined($source)) {
+		# accept only traffic on same ring
+		ruleset_addrule($ruleset, $chain, "-s $source -d $node_ip $corosync_rule", "-j $accept_action");
+	    }
+	});
     }
 
     # implement output policy
@@ -2701,13 +2784,13 @@ sub parse_hostfw_option {
 
     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
 
-    if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid):\s*(0|1)\s*$/i) {
+    if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid|protection_synflood):\s*(0|1)\s*$/i) {
 	$opt = lc($1);
 	$value = int($2);
     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
 	$opt = lc($1);
 	$value = $2 ? lc($3) : '';
-    } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
+    } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established|nf_conntrack_tcp_timeout_syn_recv|protection_synflood_rate|protection_synflood_burst|protection_limit):\s*(\d+)\s*$/i) {
 	$opt = lc($1);
 	$value = int($2);
     } else {
@@ -2760,7 +2843,7 @@ sub parse_ip_or_cidr {
     my ($cidr) = @_;
 
     my $ipversion;
-    
+
     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
 	$cidr =~ s|/128$||;
 	$ipversion = 6;
@@ -2799,20 +2882,29 @@ sub parse_alias {
 }
 
 sub generic_fw_config_parser {
-    my ($filename, $fh, $cluster_conf, $empty_conf, $rule_env) = @_;
+    my ($filename, $cluster_conf, $empty_conf, $rule_env) = @_;
 
     my $section;
     my $group;
 
     my $res = $empty_conf;
 
-    while (defined(my $line = <$fh>)) {
+    my $raw;
+    if ($filename =~ m!^/etc/pve/(.*)$!) {
+	$raw = PVE::Cluster::get_config($1);
+    } else {
+	$raw = eval { PVE::Tools::file_get_contents($filename) }; # ignore errors
+    }
+    return {} if !$raw;
+
+    my $linenr = 0;
+    while ($raw =~ /^\h*(.*?)\h*$/gm) {
+	my $line = $1;
+	$linenr++;
 	next if $line =~ m/^#/;
 	next if $line =~ m/^\s*$/;
-
 	chomp $line;
 
-	my $linenr = $fh->input_line_number();
 	my $prefix = "$filename (line $linenr)";
 
 	if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
@@ -2838,7 +2930,7 @@ sub generic_fw_config_parser {
 		warn "$prefix: $err";
 		next;
 	    }
-	    
+
 	    $res->{$section}->{$group} = [];
 	    $res->{group_comments}->{$group} =  decode('utf8', $comment)
 		if $comment;
@@ -2854,7 +2946,7 @@ sub generic_fw_config_parser {
 	    $section = 'ipset';
 	    $group = lc($1);
 	    my $comment = $2;
-	    eval {	
+	    eval {
 		die "ipset name too long\n" if length($group) > $max_ipset_name_length;
 		die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
 	    };
@@ -2923,7 +3015,7 @@ sub generic_fw_config_parser {
 		$errors->{nomatch} = "nomatch not supported by kernel";
 	    }
 
-	    eval { 
+	    eval {
 		if ($cidr =~ m/^${ip_alias_pattern}$/) {
 		    resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
 		} else {
@@ -2961,47 +3053,8 @@ sub generic_fw_config_parser {
     return $res;
 }
 
-sub parse_hostfw_config {
-    my ($filename, $fh, $cluster_conf) = @_;
-
-    my $empty_conf = { rules => [], options => {}};
-
-    return generic_fw_config_parser($filename, $fh, $cluster_conf, $empty_conf, 'host');
-}
-
-sub parse_vmfw_config {
-    my ($filename, $fh, $cluster_conf, $rule_env) = @_;
-
-    my $empty_conf = {
-	rules => [],
-	options => {},
-	aliases => {},
-	ipset => {} ,
-	ipset_comments => {},
-    };
-
-    return generic_fw_config_parser($filename, $fh, $cluster_conf, $empty_conf, $rule_env);
-}
-
-sub parse_clusterfw_config {
-    my ($filename, $fh) = @_;
-
-    my $section;
-    my $group;
-
-    my $empty_conf = {
-	rules => [],
-	options => {},
-	aliases => {},
-	groups => {},
-	group_comments => {},
-	ipset => {} ,
-	ipset_comments => {},
-    };
-
-    return generic_fw_config_parser($filename, $fh, $empty_conf, $empty_conf, 'cluster');
-}
-
+# this is only used to prevent concurrent runs of rule compilation/application
+# see lock_*_conf for cfs locks protectiong config modification
 sub run_locked {
     my ($code, @param) = @_;
 
@@ -3050,18 +3103,34 @@ sub read_local_vm_config {
     return $vmdata;
 };
 
+sub lock_vmfw_conf {
+    my ($vmid, $timeout, $code, @param) = @_;
+
+    die "can't lock VM firewall config for undefined VMID\n"
+	if !defined($vmid);
+
+    my $res = PVE::Cluster::cfs_lock_firewall("vm-$vmid", $timeout, $code, @param);
+    die $@ if $@;
+
+    return $res;
+}
+
 sub load_vmfw_conf {
     my ($cluster_conf, $rule_env, $vmid, $dir) = @_;
 
-    my $vmfw_conf = {};
-
     $dir = $pvefw_conf_dir if !defined($dir);
-
     my $filename = "$dir/$vmid.fw";
-    if (my $fh = IO::File->new($filename, O_RDONLY)) {
-	$vmfw_conf = parse_vmfw_config($filename, $fh, $cluster_conf, $rule_env);
-	$vmfw_conf->{vmid} = $vmid;
-    }
+
+    my $empty_conf = {
+	rules => [],
+	options => {},
+	aliases => {},
+	ipset => {} ,
+	ipset_comments => {},
+    };
+
+    my $vmfw_conf = generic_fw_config_parser($filename, $cluster_conf, $empty_conf, $rule_env);
+    $vmfw_conf->{vmid} = $vmid;
 
     return $vmfw_conf;
 }
@@ -3138,7 +3207,7 @@ my $format_aliases = sub {
 
 my $format_ipsets = sub {
     my ($fw_conf) = @_;
-    
+
     my $raw = '';
 
     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
@@ -3213,13 +3282,15 @@ sub clone_vmfw_conf {
     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
 
-    if (-f $clonevm_conffile) {
-	unlink $clonevm_conffile;
-    }
-    if (-f $sourcevm_conffile) {
-	my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
-	PVE::Tools::file_set_contents($clonevm_conffile, $data);
-    }
+    lock_vmfw_conf($newid, 10, sub {
+	if (-f $clonevm_conffile) {
+	    unlink $clonevm_conffile;
+	}
+	if (-f $sourcevm_conffile) {
+	    my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
+	    PVE::Tools::file_set_contents($clonevm_conffile, $data);
+	}
+    });
 }
 
 sub read_vm_firewall_configs {
@@ -3229,12 +3300,12 @@ sub read_vm_firewall_configs {
 
     foreach my $vmid (keys %{$vmdata->{qemu}}) {
 	my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir);
-	next if !$vmfw_conf->{options}; # skip if file does not exists
+	next if !$vmfw_conf->{options}; # skip if file does not exist
 	$vmfw_configs->{$vmid} = $vmfw_conf;
     }
     foreach my $vmid (keys %{$vmdata->{lxc}}) {
         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir);
-        next if !$vmfw_conf->{options}; # skip if file does not exists
+        next if !$vmfw_conf->{options}; # skip if file does not exist
         $vmfw_configs->{$vmid} = $vmfw_conf;
     }
 
@@ -3393,17 +3464,31 @@ my $set_global_log_ratelimit = sub {
     }
 };
 
+sub lock_clusterfw_conf {
+    my ($timeout, $code, @param) = @_;
+
+    my $res = PVE::Cluster::cfs_lock_firewall("cluster", $timeout, $code, @param);
+    die $@ if $@;
+
+    return $res;
+}
+
 sub load_clusterfw_conf {
     my ($filename) = @_;
 
     $filename = $clusterfw_conf_filename if !defined($filename);
+    my $empty_conf = {
+	rules => [],
+	options => {},
+	aliases => {},
+	groups => {},
+	group_comments => {},
+	ipset => {} ,
+	ipset_comments => {},
+    };
 
-    my $cluster_conf = {};
-    if (my $fh = IO::File->new($filename, O_RDONLY)) {
-	$cluster_conf = parse_clusterfw_config($filename, $fh);
-
-	$set_global_log_ratelimit->($cluster_conf->{options});
-    }
+    my $cluster_conf = generic_fw_config_parser($filename, $empty_conf, $empty_conf, 'cluster');
+    $set_global_log_ratelimit->($cluster_conf->{options});
 
     return $cluster_conf;
 }
@@ -3420,7 +3505,7 @@ sub save_clusterfw_conf {
     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
 
     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
- 
+
     my $rules = $cluster_conf->{rules};
     if ($rules && scalar(@$rules)) {
 	$raw .= "[RULES]\n\n";
@@ -3451,16 +3536,22 @@ sub save_clusterfw_conf {
     }
 }
 
+sub lock_hostfw_conf {
+    my ($timeout, $code, @param) = @_;
+
+    my $res = PVE::Cluster::cfs_lock_firewall("host-$nodename", $timeout, $code, @param);
+    die $@ if $@;
+
+    return $res;
+}
+
 sub load_hostfw_conf {
     my ($cluster_conf, $filename) = @_;
 
     $filename = $hostfw_conf_filename if !defined($filename);
 
-    my $hostfw_conf = {};
-    if (my $fh = IO::File->new($filename, O_RDONLY)) {
-	$hostfw_conf = parse_hostfw_config($filename, $fh, $cluster_conf);
-    }
-    return $hostfw_conf;
+    my $empty_conf = { rules => [], options => {}};
+    return generic_fw_config_parser($filename, $cluster_conf, $empty_conf, 'host');
 }
 
 sub save_hostfw_conf {
@@ -3486,7 +3577,7 @@ sub save_hostfw_conf {
 }
 
 sub compile {
-    my ($cluster_conf, $hostfw_conf, $vmdata) = @_;
+    my ($cluster_conf, $hostfw_conf, $vmdata, $corosync_conf) = @_;
 
     my $vmfw_configs;
 
@@ -3507,6 +3598,10 @@ sub compile {
 
 	$hostfw_conf = load_hostfw_conf($cluster_conf, undef) if !$hostfw_conf;
 
+	# cfs_update is handled by daemon or API
+	$corosync_conf = PVE::Cluster::cfs_read_file("corosync.conf")
+	    if !defined($corosync_conf) && PVE::Corosync::check_conf_exists(1);
+
 	$vmdata = read_local_vm_config();
 	$vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef);
     }
@@ -3526,16 +3621,44 @@ sub compile {
 
     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
 
-    my $ruleset = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4);
-    my $rulesetv6 = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6);
+    my $ruleset = {};
+    my $rulesetv6 = {};
+    $ruleset->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
+    $ruleset->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
+    $rulesetv6->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
+    $rulesetv6->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
     my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata);
     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
 
     return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
 }
 
+sub compile_iptables_raw {
+    my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
+
+    my $ruleset = {};
+
+    my $hostfw_options = $hostfw_conf->{options} || {};
+    my $protection_synflood = $hostfw_options->{protection_synflood} || 0;
+
+    if($protection_synflood) {
+
+	my $protection_synflood_rate = $hostfw_options->{protection_synflood_rate} ? $hostfw_options->{protection_synflood_rate} : 200;
+	my $protection_synflood_burst = $hostfw_options->{protection_synflood_burst} ? $hostfw_options->{protection_synflood_burst} : 1000;
+	my $protection_synflood_limit = $hostfw_options->{protection_synflood_limit} ? $hostfw_options->{protection_synflood_limit} : 3000;
+ 	my $protection_synflood_expire = $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} ? $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} : 60;
+	$protection_synflood_expire = $protection_synflood_expire * 1000;
+	my $protection_synflood_mask = $ipversion == 4 ? 32 : 64;
+
+	ruleset_create_chain($ruleset, "PVEFW-PREROUTING");
+	ruleset_addrule($ruleset, "PVEFW-PREROUTING", "-p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m hashlimit --hashlimit-above $protection_synflood_rate/sec --hashlimit-burst $protection_synflood_burst --hashlimit-mode srcip --hashlimit-name syn --hashlimit-htable-size 2097152 --hashlimit-srcmask $protection_synflood_mask --hashlimit-htable-expire $protection_synflood_expire", "-j DROP");
+    }
+
+    return $ruleset;
+}
+
 sub compile_iptables_filter {
-    my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $ipversion) = @_;
+    my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
 
     my $ruleset = {};
 
@@ -3565,7 +3688,7 @@ sub compile_iptables_filter {
     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
 
     if ($hostfw_enable) {
-	eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion); };
+	eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf); };
 	warn $@ if $@; # just to be sure - should not happen
     }
 
@@ -3574,19 +3697,19 @@ sub compile_iptables_filter {
 	eval {
 	    my $conf = $vmdata->{qemu}->{$vmid};
 	    my $vmfw_conf = $vmfw_configs->{$vmid};
-	    return if !$vmfw_conf;
+	    return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
 
 	    foreach my $netid (sort keys %$conf) {
 		next if $netid !~ m/^net(\d+)$/;
 		my $net = PVE::QemuServer::parse_net($conf->{$netid});
 		next if !$net->{firewall};
-		my $iface = "tap${vmid}i$1";
 
+		my $iface = "tap${vmid}i$1";
 		my $macaddr = $net->{macaddr};
 		generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
-					     $vmfw_conf, $vmid, 'IN', $ipversion);
+		                             $vmfw_conf, $vmid, 'IN', $ipversion);
 		generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
-					     $vmfw_conf, $vmid, 'OUT', $ipversion);
+		                             $vmfw_conf, $vmid, 'OUT', $ipversion);
 	    }
 	};
 	warn $@ if $@; # just to be sure - should not happen
@@ -3594,29 +3717,28 @@ sub compile_iptables_filter {
 
     # generate firewall rules for LXC containers
     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
-        eval {
-            my $conf = $vmdata->{lxc}->{$vmid};
-            my $vmfw_conf = $vmfw_configs->{$vmid};
-            return if !$vmfw_conf;
-
-            if ($vmfw_conf->{options}->{enable}) {
-		foreach my $netid (sort keys %$conf) {
-                    next if $netid !~ m/^net(\d+)$/;
-                    my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
-                    next if !$net->{firewall};
-                    my $iface = "veth${vmid}i$1";
-		    my $macaddr = $net->{hwaddr};
-                    generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
-                                                 $vmfw_conf, $vmid, 'IN', $ipversion);
-                    generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
-                                                 $vmfw_conf, $vmid, 'OUT', $ipversion);
-		}
-            }
-        };
-        warn $@ if $@; # just to be sure - should not happen
+	eval {
+	    my $conf = $vmdata->{lxc}->{$vmid};
+	    my $vmfw_conf = $vmfw_configs->{$vmid};
+	    return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
+
+	    foreach my $netid (sort keys %$conf) {
+		next if $netid !~ m/^net(\d+)$/;
+		my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
+		next if !$net->{firewall};
+
+		my $iface = "veth${vmid}i$1";
+		my $macaddr = $net->{hwaddr};
+		generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
+		                             $vmfw_conf, $vmid, 'IN', $ipversion);
+		generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
+		                             $vmfw_conf, $vmid, 'OUT', $ipversion);
+	    }
+	};
+	warn $@ if $@; # just to be sure - should not happen
     }
 
-    if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
+    if (ruleset_chain_exist($ruleset, "PVEFW-IPS")){
 	ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
     }
 
@@ -3645,7 +3767,7 @@ sub compile_ipsets {
 	my $localnet_ver;
 	($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
 
-	$cluster_conf->{aliases}->{local_network} = { 
+	$cluster_conf->{aliases}->{local_network} = {
 	    name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
     }
 
@@ -3812,7 +3934,14 @@ sub compile_ebtables_filter {
 			push(@$arpfilter, $ip);
 		    }
 		}
-		push(@$arpfilter, $net->{ip}) if $net->{ip} && $vmfw_conf->{options}->{ipfilter};
+		if (defined(my $ip = $net->{ip}) && $vmfw_conf->{options}->{ipfilter}) {
+		    # ebtables changes this to a .0/MASK network but we just
+		    # want the address here, no network - see #2193
+		    $ip =~ s|/(\d+)$||;
+		    if ($ip ne 'dhcp') {
+			push @$arpfilter, $ip;
+		    }
+		}
 		generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
 	    }
 	};
@@ -3928,11 +4057,13 @@ sub print_sig_rule {
 }
 
 sub get_ruleset_cmdlist {
-    my ($ruleset, $iptablescmd) = @_;
+    my ($ruleset, $iptablescmd, $table) = @_;
+
+    $table = 'filter' if !$table;
 
-    my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
+    my $cmdlist = "*$table\n"; # we pass this to iptables-restore;
 
-    my ($active_chains, $hooks) = iptables_get_chains($iptablescmd);
+    my ($active_chains, $hooks) = iptables_get_chains($iptablescmd, $table);
     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest);
 
     # create missing chains first
@@ -3944,7 +4075,7 @@ sub get_ruleset_cmdlist {
 	$cmdlist .= ":$chain - [0:0]\n";
     }
 
-    foreach my $h (qw(INPUT OUTPUT FORWARD)) {
+    foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
 	my $chain = "PVEFW-$h";
 	if ($ruleset->{$chain} && !$hooks->{$h}) {
 	    $cmdlist .= "-A $h -j $chain\n";
@@ -3979,10 +4110,11 @@ sub get_ruleset_cmdlist {
 	next if $chain eq 'PVEFW-INPUT';
 	next if $chain eq 'PVEFW-OUTPUT';
 	next if $chain eq 'PVEFW-FORWARD';
+	next if $chain eq 'PVEFW-PREROUTING';
 	$cmdlist .= "-X $chain\n";
     }
 
-    my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
+    my $changes = $cmdlist ne "*$table\n" ? 1 : 0;
 
     $cmdlist .= "COMMIT\n";
 
@@ -4013,8 +4145,8 @@ sub get_ebtables_cmdlist {
 
     foreach my $chain (sort keys %$statushash) {
 	my $stat = $statushash->{$chain};
-	next if ($stat->{action} eq 'delete');
 	$changes = 1 if ($stat->{action} !~ 'ignore|exists');
+	next if ($stat->{action} eq 'delete');
 
 	foreach my $cmd (@{$statushash->{$chain}->{'rules'}}) {
 	    if ($chain eq 'FORWARD' && $cmd eq $append_pve_to_forward) {
@@ -4095,9 +4227,11 @@ sub apply_ruleset {
     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
 	get_ipset_cmdlist($ipset_ruleset);
 
-    my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset);
-    my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, "ip6tables");
+    my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset->{filter});
+    my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6->{filter}, "ip6tables");
     my ($ebtables_cmdlist, $ebtables_changes) = get_ebtables_cmdlist($ebtables_ruleset);
+    my ($cmdlist_raw, $changes_raw) = get_ruleset_cmdlist($ruleset->{raw}, undef, 'raw');
+    my ($cmdlistv6_raw, $changesv6_raw) = get_ruleset_cmdlist($rulesetv6->{raw}, "ip6tables", 'raw');
 
     if ($verbose) {
 	if ($ipset_changes) {
@@ -4116,6 +4250,16 @@ sub apply_ruleset {
 	    print $cmdlistv6;
 	}
 
+	if ($changes_raw) {
+	    print "iptables table raw changes:\n";
+	    print $cmdlist_raw;
+	}
+
+	if ($changesv6_raw) {
+	    print "ip6tables table raw changes:\n";
+	    print $cmdlistv6_raw;
+	}
+
 	if ($ebtables_changes) {
 	    print "ebtables changes:\n";
 	    print $ebtables_cmdlist;
@@ -4132,11 +4276,21 @@ sub apply_ruleset {
 
     iptables_restore_cmdlist($cmdlist);
 
+    $tmpfile = "$pve_fw_status_dir/ip4cmdlistraw";
+    PVE::Tools::file_set_contents($tmpfile, $cmdlist_raw || '');
+
+    iptables_restore_cmdlist($cmdlist_raw, 'raw');
+
     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
 
     ip6tables_restore_cmdlist($cmdlistv6);
 
+    $tmpfile = "$pve_fw_status_dir/ip6cmdlistraw";
+    PVE::Tools::file_set_contents($tmpfile, $cmdlistv6_raw || '');
+
+    ip6tables_restore_cmdlist($cmdlistv6_raw, 'raw');
+
     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
 
@@ -4148,11 +4302,12 @@ sub apply_ruleset {
     PVE::Tools::file_set_contents($tmpfile, $ebtables_cmdlist || '');
 
     # test: re-read status and check if everything is up to date
+    my $ruleset_filter = $ruleset->{filter};
     my $active_chains = iptables_get_chains();
-    my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest);
+    my $statushash = get_ruleset_status($ruleset_filter, $active_chains, \&iptables_chain_digest);
 
     my $errors;
-    foreach my $chain (sort keys %$ruleset) {
+    foreach my $chain (sort keys %$ruleset_filter) {
 	my $stat = $statushash->{$chain};
 	if ($stat->{action} ne 'exists') {
 	    warn "unable to update chain '$chain'\n";
@@ -4160,10 +4315,11 @@ sub apply_ruleset {
 	}
     }
 
+    my $rulesetv6_filter = $rulesetv6->{filter};
     my $active_chainsv6 = iptables_get_chains("ip6tables");
-    my $statushashv6 = get_ruleset_status($rulesetv6, $active_chainsv6, \&iptables_chain_digest);
+    my $statushashv6 = get_ruleset_status($rulesetv6_filter, $active_chainsv6, \&iptables_chain_digest);
 
-    foreach my $chain (sort keys %$rulesetv6) {
+    foreach my $chain (sort keys %$rulesetv6_filter) {
 	my $stat = $statushashv6->{$chain};
 	if ($stat->{action} ne 'exists') {
 	    warn "unable to update chain '$chain'\n";
@@ -4171,6 +4327,30 @@ sub apply_ruleset {
 	}
     }
 
+    my $ruleset_raw = $ruleset->{raw};
+    my $active_chains_raw = iptables_get_chains(undef, 'raw');
+    my $statushash_raw = get_ruleset_status($ruleset_raw, $active_chains_raw, \&iptables_chain_digest);
+
+    foreach my $chain (sort keys %$ruleset_raw) {
+	my $stat = $statushash_raw->{$chain};
+	if ($stat->{action} ne 'exists') {
+	    warn "unable to update chain '$chain'\n";
+	    $errors = 1;
+	}
+    }
+
+    my $rulesetv6_raw = $rulesetv6->{raw};
+    my $active_chainsv6_raw = iptables_get_chains("ip6tables", 'raw');
+    my $statushashv6_raw = get_ruleset_status($rulesetv6_raw, $active_chainsv6_raw, \&iptables_chain_digest);
+
+    foreach my $chain (sort keys %$rulesetv6_raw) {
+	my $stat = $statushashv6_raw->{$chain};
+	if ($stat->{action} ne 'exists') {
+	    warn "unable to update chain '$chain'\n";
+	    $errors = 1;
+	}
+    }
+
     my $active_ebtables_chains = ebtables_get_chains();
     my $ebtables_statushash = get_ruleset_status($ebtables_ruleset,
 				$active_ebtables_chains, \&iptables_chain_digest,
@@ -4190,13 +4370,15 @@ sub apply_ruleset {
 
     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
 
+    update_nf_conntrack_tcp_timeout_syn_recv($hostfw_conf);
+
     update_nf_conntrack_logging($hostfw_conf);
 }
 
 sub update_nf_conntrack_max {
     my ($hostfw_conf) = @_;
 
-    my $max = 65536; # reasonable default
+    my $max = 262144; # reasonable default (2^16 * 4), see nf_conntrack-sysctl docs
 
     my $options = $hostfw_conf->{options} || {};
 
@@ -4227,6 +4409,16 @@ sub update_nf_conntrack_tcp_timeout_established {
     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
 }
 
+sub update_nf_conntrack_tcp_timeout_syn_recv {
+    my ($hostfw_conf) = @_;
+
+    my $options = $hostfw_conf->{options} || {};
+
+    my $value = defined($options->{nf_conntrack_tcp_timeout_syn_recv}) ? $options->{nf_conntrack_tcp_timeout_syn_recev} : 60;
+
+    PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv", $value);
+}
+
 my $log_nf_conntrack_enabled = undef;
 sub update_nf_conntrack_logging {
     my ($hostfw_conf) = @_;
@@ -4239,7 +4431,7 @@ sub update_nf_conntrack_logging {
 	my $tmpfile = "$pve_fw_status_dir/log_nf_conntrack";
 	PVE::Tools::file_set_contents($tmpfile, $value);
 
-	PVE::Tools::run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
+	run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
 	$log_nf_conntrack_enabled = $value;
     }
 }
@@ -4248,17 +4440,22 @@ sub remove_pvefw_chains {
 
     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
+    PVE::Firewall::remove_pvefw_chains_iptables("iptables", "raw");
+    PVE::Firewall::remove_pvefw_chains_iptables("ip6tables", "raw");
     PVE::Firewall::remove_pvefw_chains_ipset();
+    PVE::Firewall::remove_pvefw_chains_ebtables();
 
 }
 
 sub remove_pvefw_chains_iptables {
-    my ($iptablescmd) = @_;
+    my ($iptablescmd, $table) = @_;
 
-    my ($chash, $hooks) = iptables_get_chains($iptablescmd);
-    my $cmdlist = "*filter\n";
+    $table = 'filter' if !$table;
+
+    my ($chash, $hooks) = iptables_get_chains($iptablescmd, $table);
+    my $cmdlist = "*$table\n";
 
-    foreach my $h (qw(INPUT OUTPUT FORWARD)) {
+    foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
 	if ($hooks->{$h}) {
 	    $cmdlist .= "-D $h -j PVEFW-$h\n";
 	}
@@ -4274,9 +4471,9 @@ sub remove_pvefw_chains_iptables {
     $cmdlist .= "COMMIT\n";
 
     if($iptablescmd eq "ip6tables") {
-	ip6tables_restore_cmdlist($cmdlist);
+	ip6tables_restore_cmdlist($cmdlist, $table);
     } else {
-	iptables_restore_cmdlist($cmdlist);
+	iptables_restore_cmdlist($cmdlist, $table);
     }
 }
 
@@ -4285,7 +4482,7 @@ sub remove_pvefw_chains_ipset {
     my $ipset_chains = ipset_get_chains();
 
     my $cmdlist = "";
- 
+
     foreach my $chain (keys %$ipset_chains) {
 	$cmdlist .= "flush $chain\n";
 	$cmdlist .= "destroy $chain\n";
@@ -4294,6 +4491,11 @@ sub remove_pvefw_chains_ipset {
     ipset_restore_cmdlist($cmdlist) if $cmdlist;
 }
 
+sub remove_pvefw_chains_ebtables {
+    # apply empty ruleset = remove all our chains
+    ebtables_restore_cmdlist(get_ebtables_cmdlist({}));
+}
+
 sub init {
     my $cluster_conf = load_clusterfw_conf();
     my $cluster_options = $cluster_conf->{options};