X-Git-Url: https://git.proxmox.com/?p=pve-firewall.git;a=blobdiff_plain;f=README;h=7fd313b08d69e500c9a5023a91f749fd4996a9e6;hp=851a3c5a575238013c60777242f8a43e381d2816;hb=b4366f0078a37b8542dbeca999dc39cbd4a00f7f;hpb=f4bf58dd92d2f67c53f9bdbc02ee93ab351323ea

diff --git a/README b/README
index 851a3c5..7fd313b 100644
--- a/README
+++ b/README
@@ -1,61 +1,61 @@
 Experimental software, only used for testing!
 =============================================
 
-Note: you need to change values in /etc/sysctl.d/pve.conf to:
-
-net.bridge.bridge-nf-call-ip6tables = 1
-net.bridge.bridge-nf-call-iptables = 1
-net.bridge.bridge-nf-call-arptables = 1
-net.bridge.bridge-nf-filter-vlan-tagged = 1
-
-and reboot after that change.
 
 Quick Intro
 ===========
 
 VM firewall rules are read from /etc/pve/firewall/<VMID>.fw
 
+Security group rules are read from /etc/pve/firewall/groups.fw
+
+Host firewall rules are read from /etc/pve/local/host.fw
+
 You can find examples in the example/ dir
 
-Note: All commands overwrites /etc/shorewall/, so don't use if you have
-and existing shorewall config you want to keep.
 
-Use the following command to generate shorewall configuration:
+Use the following command to mange the firewall:
+
+To test the firewall configuration:
 
 ./pvefw compile
 
-To compile and start the firewall:
+To start or update the firewall:
 
 ./pvefw start
 
-To compile and restart the firewall:
+To update the firewall rules (the firewall is not started if it
+is not already running):
 
-./pvefw restart
+./pvefw update
 
 To stop the firewall:
 
 ./pvefw stop
 
-To clear all iptable rules:
-
-./pvefw clear
-
 
 Implementation details
 ======================
 
-We do not write iptables rules directly. Instead we use shorewall to
-do that low level stuff. 
+We write iptables rules directly, an generate the following chains 
+as entry points in the 'forward' table:
+
+PVEFW-INPUT
+PVEFW-OUTPUT
+PVEFW-FORWARD
+
+We do not touch other (user defined) chains.
 
 Each VM can have its own firewall definition file in 
 
 /etc/pve/firewall/<VMID>.fw
 
-That file has two sections for inbound [IN] and outbound [OUT] traffic.
+That file has a section [RULES] to define firewall rules.
 
-Format is: ACTION IFACE SOURCE DEST PROTO D-PORT S-PORT
+Format is: TYPE ACTION IFACE SOURCE DEST PROTO D-PORT S-PORT
 
-* ACTION: shorewall action
+* TYPE: IN|OUT|GROUP 
+* ACTION: action or macro
 * IFACE: vm network interface (net0 - net5), or '-' for all interfaces
 * SOURCE: source IP address, or '-' for any source
 * DEST: dest IP address, or '-' for any destination address
@@ -63,5 +63,66 @@ Format is: ACTION IFACE SOURCE DEST PROTO D-PORT S-PORT
 * D-PORT: destination port
 * S-PORT: source port
 
+A rule for inbound traffic looks like this:
+
+IN SSH(ACCEPT) net0
+
+Outbound rules looks like:
+
+OUT SSH(ACCEPT)
+
+Problems
+===================
+
+There are a number of restrictions when using iptables to filter
+bridged traffic. The physdev match feature does not work correctly
+when traffic is routed from host to bridge:
+
+  * when a packet being sent through a bridge entered the firewall on another interface 
+    and was being forwarded to the bridge.
+
+  * when a packet originating on the firewall itself is being sent through a bridge.
+
+So we disable the firewall if we detect such case (bridge with assigned IP address).
+You can enable it again (if you do not care) by setting "allow_bridge_route: 1" in "host.fw".
+
+The correct workaround is to remove the IP address from the bridge device, and
+use a veth device which is plugged into the bridge:
+
+---/etc/network/interfaces----
+
+...
+
+auto vmbr0
+iface vmbr0 inet manual
+	bridge_ports bond0
+	bridge_stp off
+	bridge_fd 0
+
+# this create the veth device and plug it into vmbr0
+auto pm0
+iface pm0 inet static
+	address  192.168.10.10
+	netmask  255.255.255.0
+	gateway  192.168.10.1
+	VETH_BRIDGETO vmbr0
+
+auto vmbr1
+iface vmbr1 inet manual
+      bridge_ports none
+      bridge_stp off
+      bridge_fd 0
+
+# setup masqueraded bridge port vmbr1/pm1 using pm0
+# NOTE: this needs kernel 3.10.0 or newer (for conntrack --zone) 
+auto pm1
+iface pm1 inet static
+       address 10.10.10.1
+       netmask 255.255.255.0
+       VETH_BRIDGETO vmbr1
+       VETH_MASQUERADE pm0
+
+...
 
+--------------------------------