added: ap_isolation option for bat0

docs/features/client-isolation.rst

@@ -0,0 +1,58 @@
+Client Isolation Support
+========================
+
+Normally every client is a wireless network can communicate
+with any other client in the network.
+Client Isolation is a security feature which prevents
+Client-to-Client communication.
+
+There are two different modes to isolate traffic, which can be
+selected by the ``mesh.isolate`` setting in the site or domain
+configuration.
+
+Full Client Isolation Mode
+--------------------------
+
+In the full isolation mode all traffic between wireless and
+wired clients is prevented. The Clients are only able to access
+the Gateway and the Internet.
+
+This mode may not be very useful in a Freifunk context.
+
+It can be activated by setting ``mesh.isolate`` to ``all`` in the
+site or domain configuration.
+
+::
+
+  {
+    mesh = {
+      isolate = 'all'
+    },
+
+    -- more domain specific config follows below
+  }
+
+Wireless Client Isolation Mode
+------------------------------
+
+In the wireless isolation mode only wireless clients are isolated
+from other wireless clients. Communication where a wired client is
+involved is not prevented. So every client can access any wired
+client and every wired client can access all of the clients, only
+wireless clients can not access other wireless clients.
+
+This mode may be more useful in a Freifunk context, but is still
+not as ``frei`` as without any isolation.
+
+It can be activated by setting ``mesh.isolate`` to ``wireless``
+in the site or domain configuration.
+
+::
+
+  {
+    mesh = {
+      isolate = 'wireless'
+    },
+
+    -- more domain specific config follows below
+  }

docs/index.rst

@@ -31,6 +31,7 @@ Several Freifunk communities in Germany use Gluon as the foundation of their Fre
   features/authorized-keys
   features/roles
   features/vpn
+  features/client-isolation
 
 .. toctree::
   :caption: Developer Documentation

package/gluon-client-isolation/Makefile

@@ -0,0 +1,40 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=gluon-client-isolation
+
+include ../gluon.mk
+
+define Package/gluon-client-isolation
+  TITLE:=Support for client isolation over batman-adv
+  DEPENDS:=+gluon-core +gluon-ebtables gluon-mesh-batman-adv
+endef
+
+define Package/gluon-client-isolation/description
+	This package provides client isolation in a batman-adv
+	bridged layer 2 network.
+
+	To use it, mesh.isolate must be set in the site or
+	domain configuration.
+
+	When it is set to wireless, wireless clients are isolated from
+	other wireless clients, wireless to wired, wired to wireless
+	and wire to wired traffic is not affected in this mode.
+
+	When it is set to all, wired traffic is also isolated.
+
+	To isolate the clients connected to the same wireless interface,
+	it sets the isolate option in the wireless configuration for
+	the client and owe wifi interfaces.
+
+	To extend the isolation the ap_isolation and isolation_mark
+	options are set for the gluon_bat0 network interface.
+
+	A new filter chain ISOLATED is added to ebtables, through which
+	all traffic of br-client is routed.
+	Depending the value of mesh.isolate, the traffic is marked when
+	it arrives from the interfaces to isolate and batman-adv
+	restores the mark for isolated traffic from other nodes.
+	The marked traffic will not be forwarded to isolated interfaces.
+endef
+
+$(eval $(call BuildPackageGluon,gluon-client-isolation))

package/gluon-client-isolation/luasrc/lib/gluon/ebtables/100-isolated-chain

@@ -0,0 +1 @@
+chain('ISOLATED', 'ACCEPT')

package/gluon-client-isolation/luasrc/lib/gluon/ebtables/110-mark-isolated-rules

@@ -0,0 +1,12 @@
+local isolate = require('gluon.site').mesh.isolate("none")
+
+if isolate == "all" then
+	for _,dev in ipairs({ 'eth0', 'eth1', 'client0', 'client1', 'owe0', 'owe1' }) do
+		rule('ISOLATED -i ' .. dev .. ' -j mark --mark-or 0x10 --mark-target CONTINUE')
+	end
+end
+if isolate == "wireless" then
+	for _,dev in ipairs({ 'client0', 'client1', 'owe0', 'owe1' }) do
+		rule('ISOLATED -i ' .. dev .. ' -j mark --mark-or 0x10 --mark-target CONTINUE')
+	end
+end

package/gluon-client-isolation/luasrc/lib/gluon/ebtables/120-drop-marked-isolated-rules

@@ -0,0 +1,12 @@
+local isolate = require('gluon.site').mesh.isolate("none")
+
+if isolate == "all" then
+	for _,dev in ipairs({ 'eth0', 'eth1', 'client0', 'client1', 'owe0', 'owe1' }) do
+		rule('ISOLATED -o ' .. dev .. ' --mark 0x10/0x10 -j DROP')
+	end
+end
+if isolate == "wireless" then
+	for _,dev in ipairs({ 'client0', 'client1', 'owe0', 'owe1' }) do
+		rule('ISOLATED -o ' .. dev .. ' --mark 0x10/0x10 -j DROP')
+	end
+end

package/gluon-client-isolation/luasrc/lib/gluon/ebtables/400-isolated-rules

@@ -0,0 +1 @@
+rule('FORWARD --logical-in br-client -j ISOLATED')

package/gluon-client-isolation/luasrc/lib/gluon/upgrade/340-client-isolation

@@ -0,0 +1,38 @@
+#!/usr/bin/lua
+
+local site = require 'gluon.site'
+local wireless = require 'gluon.wireless'
+
+local isolate = site.mesh.isolate("none")
+
+local uci = require('simple-uci').cursor()
+
+wireless.foreach_radio(uci, function(radio)
+	local radio_name = radio['.name']
+	local vif = 'client_' .. radio_name
+	if uci:get('wireless', vif) then
+		uci:delete('wireless', vif, 'isolate')
+		if isolate == "all" or isolate == "wireless" then
+			uci:set('wireless', vif, 'isolate', '1')
+		end
+	end
+	vif = 'owe_' .. radio_name
+	if uci:get('wireless', vif) then
+		uci:delete('wireless', vif, 'isolate')
+		if isolate == "all" or isolate == "wireless" then
+			uci:set('wireless', vif, 'isolate', '1')
+		end
+	end
+end)
+
+uci:save('wireless')
+
+uci:delete('network', 'gluon_bat0', 'ap_isolation')
+uci:delete('network', 'gluon_bat0', 'isolation_mark')
+
+if isolate == "all" or isolate == "wireless" then
+	uci:set('network', 'gluon_bat0', 'ap_isolation', '1')
+	uci:set('network', 'gluon_bat0', 'isolation_mark', '0x10/0x10')
+end
+
+uci:save('network')

package/gluon-mesh-batman-adv/files/lib/netifd/proto/gluon_bat0.sh

@@ -10,6 +10,8 @@ proto_gluon_bat0_init_config() {
 	renew_handler=1
 
 	proto_config_add_string 'gw_mode'
+	proto_config_add_boolean 'ap_isolation:bool'
+	proto_config_add_string 'isolation_mark'
 }
 
 lookup_site() {
@@ -40,14 +42,21 @@ proto_gluon_bat0_setup() {
 	local routing_algo="$(lookup_site 'mesh.batman_adv.routing_algo' 'BATMAN_IV')"
 
 	local gw_mode
+	local ap_isolation
+	local isolation_mark
 	json_get_vars gw_mode
+	json_get_vars ap_isolation
+	json_get_vars isolation_mark
 
 	batctl routing_algo "$routing_algo"
 	batctl interface create
 
 	batctl orig_interval 5000
 	batctl hop_penalty "$(lookup_uci 'gluon.mesh_batman_adv.hop_penalty' 15)"
 	batctl noflood_mark 0x4/0x4
+
+	[ -n "$ap_isolation" ] && batctl ap_isolation "$ap_isolation"
+	[ -n "$isolation_mark" ] && batctl isolation_mark "$isolation_mark"
 
 	case "$gw_mode" in
 		server)