applications/luci-splash: add optional QoS rate limiting for splash clients

2 files changed, 211 insertions, 44 deletions

diff --git a/applications/luci-splash/root/etc/init.d/luci_splash b/applications/luci-splash/root/etc/init.d/luci_splash
index ffcd6f8837..582c2e2f95 100755
--- a/applications/luci-splash/root/etc/init.d/luci_splash
+++ b/applications/luci-splash/root/etc/init.d/luci_splash
@@ -1,6 +1,14 @@
 #!/bin/sh /etc/rc.common
 START=70
 EXTRA_COMMANDS=clear_leases
+SPLASH_INTERFACES=""
+LIMIT_DOWN=0
+LIMIT_DOWN_BURST=0
+LIMIT_UP=0
+
+silent() {
+	"$@" 2>/dev/null
+}
 
 iface_add() {
 	local cfg="$1"
@@ -10,6 +18,9 @@ iface_add() {
 	
 	config_get net "$cfg" network
 	[ -n "$net" ] || return 0
+
+	config_get ifname "$net" ifname
+	[ -n "$ifname" ] || return 0
 	
 	config_get ipaddr "$net" ipaddr
 	[ -n "$ipaddr" ] || return 0
@@ -23,12 +34,22 @@ iface_add() {
 	iptables -t nat -A luci_splash_prerouting -s "$NETWORK/$PREFIX" -p ! tcp -j luci_splash_portal
 	iptables -t nat -A luci_splash_prerouting -s "$NETWORK/$PREFIX" -d ! "$ipaddr" -j luci_splash_portal
 	iptables -t nat -A luci_splash_prerouting -s "$NETWORK/$PREFIX" -d "$ipaddr" -p tcp -m multiport ! --dport 22,80,443 -j luci_splash_portal
+
+	qos_iface_add "$ifname"
+
+	append SPLASH_INTERFACES "$ifname"
 }
 
 iface_del() {
 	config_get zone "$1" zone                                                                
 	[ -n "$zone" ] || return 0
+
+	config_get ifname "$1" ifname
+	[ -n "$ifname" ] || return 0
+
 	while iptables -t nat -D prerouting_${zone} -j luci_splash_prerouting 2>&-; do :; done
+
+	qos_iface_del "$ifname"
 }
 
 blacklist_add() {
@@ -36,8 +57,8 @@ blacklist_add() {
 	
 	config_get mac "$cfg" mac
 	[ -n "$mac" ] && {
-		iptables -I luci_splash_counter -m mac --mac-source "$mac" -j RETURN
-		iptables -t nat -I luci_splash_leases -m mac --mac-source "$mac" -j DROP
+		iptables -t filter -I luci_splash_counter -m mac --mac-source "$mac" -j RETURN
+		iptables -t nat    -I luci_splash_leases  -m mac --mac-source "$mac" -j DROP
 	}
 }
 
@@ -45,19 +66,81 @@ whitelist_add() {
 	local cfg="$1"
 	
 	config_get mac "$cfg" mac
+	[ -n "$mac" ] && {
+		iptables -t filter -I luci_splash_counter -m mac --mac-source "$mac" -j RETURN
+		iptables -t nat    -I luci_splash_leases  -m mac --mac-source "$mac" -j RETURN
+	}
+}
+
+lease_add() {
+	local cfg="$1"
+	
+	config_get mac "$cfg" mac
 	config_get ban "$cfg" kicked
 
 	ban=${ban:+DROP}
 
 	[ -n "$mac" ] && {
-		iptables -I luci_splash_counter -m mac --mac-source "$mac" -j RETURN
-		iptables -t nat -I luci_splash_leases -m mac --mac-source "$mac" -j "${ban:-RETURN}"
+		local oIFS="$IFS"; IFS=":"
+		set -- $mac
+		IFS="$oIFS"; unset oIFS
+	
+		local mac_pre="$1$2"
+		local mac_post="$3$4$5$6"
+		local handle="$6"
+
+		iptables -t filter -I luci_splash_counter -m mac --mac-source "$mac" -j RETURN
+		iptables -t mangle -I luci_splash_mark    -m mac --mac-source "$mac" -j MARK --set-mark 79
+		iptables -t nat    -I luci_splash_leases  -m mac --mac-source "$mac" -j "${ban:-RETURN}"
+
+		for i in $SPLASH_INTERFACES; do
+			tc filter add dev $i parent 77:0 protocol ip prio 2 handle ::$handle u32 \
+				match u16 0x0800 0xFFFF at -2 match u32 0x$mac_post 0xFFFFFFFF at -12 \
+				match u16 0x$mac_pre 0xFFFF at -14 flowid 77:10
+		done
 	}
 }
 
-boot() {
-	### We are started by the firewall include
+qos_iface_add() {
+	local iface="$1"
+
+	# 77 -> download root qdisc
+	# 78 -> upload root qdisc
+	# 79 -> fwmark
+
+	tc qdisc del dev "$iface" root handle 77:
+
+	if [ "$LIMIT_UP" -gt 0 -a "$LIMIT_DOWN" -gt 0 ]; then
+		tc qdisc add dev "$iface" root handle 77: htb
+
+		# assume maximum rate of 20.000 kilobit for wlan
+		tc class add dev "$iface" parent 77: classid 77:1 htb rate 20000kbit
+
+		# set download limit and burst
+		tc class add dev "$iface" parent 77:1 classid 77:10 htb \
+			rate ${LIMIT_DOWN}kbit ceil ${LIMIT_DOWN_BURST}kbit prio 2
+
+		tc qdisc add dev "$iface" parent 77:10 handle 78: sfq perturb 10
+
+		# adding ingress can result in "File exists" if qos-scripts are active
+		silent tc qdisc add dev "$iface" ingress
 
+		# set client upload speed
+		tc filter add dev "$iface" parent ffff: protocol ip prio 1 \
+			handle 79 fw police rate ${LIMIT_UP}kbit mtu 6k burst 6k drop
+	fi	
+}
+
+qos_iface_del() {
+	local iface="$1"
+
+	tc qdisc del dev "$iface" root handle 77:
+	tc qdisc del dev "$iface" root handle 78:
+	tc filter del dev "$iface" parent ffff: protocol ip prio 1 handle 79 fw
+}
+
+boot() {
+	### Setup splash-relay
 	uci get lucid.splashr || {
 uci batch <<EOF
 	set lucid.splashr=daemon
@@ -74,6 +157,8 @@ uci batch <<EOF
 	commit lucid
 EOF
 	}
+
+	### We are started by the firewall include
 	exit 0
 }
 
@@ -82,56 +167,102 @@ start() {
 	include /lib/network
 	scan_interfaces
 	config_load luci_splash
+	
+	### Find QoS limits
+	config_get LIMIT_UP general limit_up
+	config_get LIMIT_DOWN general limit_down
+	config_get LIMIT_DOWN_BURST general limit_down_burst
+
+	LIMIT_UP="${LIMIT_UP:-0}"
+	LIMIT_DOWN="${LIMIT_DOWN:-0}"
+	LIMIT_DOWN_BURST="${LIMIT_DOWN_BURST:-$(($LIMIT_DOWN * 2))}"
+
+	### Load required modules
+	[ "$LIMIT_IP" -gt 0 -a "$LIMIT_DOWN" -gt 0 ] && {
+		silent insmod cls_fw
+		silent insmod cls_route
+		silent insmod cls_rsvp
+		silent insmod cls_rsvp6
+		silent insmod cls_tcindex
+		silent insmod cls_u32
+		silent insmod sch_cbq
+		silent insmod sch_csz
+		silent insmod sch_dsmark
+		silent insmod sch_gred
+		silent insmod sch_hfsc
+		silent insmod sch_htb
+		silent insmod sch_ingress
+		silent insmod sch_red
+		silent insmod sch_tbf
+		silent insmod sch_teql
+	}
 
 	### Create subchains
-	iptables -N luci_splash_counter
-	iptables -t nat -N luci_splash_portal
-	iptables -t nat -N luci_splash_leases
-	iptables -t nat -N luci_splash_prerouting
+	iptables -t filter -N luci_splash_counter
+	iptables -t nat    -N luci_splash_portal
+	iptables -t nat    -N luci_splash_leases
+	iptables -t nat    -N luci_splash_prerouting
+
+	[ "$LIMIT_UP" -gt 0 -a "$LIMIT_DOWN" -gt 0 ] && \
+		iptables -t mangle -N luci_splash_mark
 
 	### Build the main and portal rule
+	config_foreach iface_add iface
 	config_foreach blacklist_add blacklist
 	config_foreach whitelist_add whitelist
-	config_foreach whitelist_add lease
-	config_foreach iface_add iface
-
+	config_foreach lease_add lease
+	
 	### Build the portal rule
-	iptables -I INPUT -j luci_splash_counter
-	iptables -I FORWARD -j luci_splash_counter
+	iptables -t filter -I INPUT      -j luci_splash_counter
+	iptables -t filter -I FORWARD    -j luci_splash_counter
+
+	[ "$LIMIT_UP" -gt 0 -a "$LIMIT_DOWN" -gt 0 ] && \
+		iptables -t mangle -I PREROUTING -j luci_splash_mark
+	
 	iptables -t nat -A luci_splash_portal -p udp --dport 33434:33523 -j RETURN
 	iptables -t nat -A luci_splash_portal -p icmp -j RETURN
 	iptables -t nat -A luci_splash_portal -p udp --dport 53 -j RETURN
 	iptables -t nat -A luci_splash_portal -j luci_splash_leases
-
+	
 	### Build the leases rule
 	iptables -t nat -A luci_splash_leases -p tcp --dport 80 -j REDIRECT --to-ports 8082
 	iptables -t nat -A luci_splash_leases -j DROP
-
+	
 	### Add crontab entry
 	test -f /etc/crontabs/root || touch /etc/crontabs/root
 	grep -q luci-splash /etc/crontabs/root || {
 		echo '*/5 * * * * 	/usr/sbin/luci-splash sync' >> /etc/crontabs/root
 	}
+
+	### Start the splash httpd
+	start-stop-daemon -S -m -p /var/run/luci-splashd.pid -b -q -x /usr/bin/luci-splashd
 }
 
 stop() {
 	### Clear interface rules
 	config_load luci_splash
 	config_foreach iface_del iface
-	iptables -D INPUT -j luci_splash_counter
-	iptables -D FORWARD -j luci_splash_counter
 
+	silent iptables -t filter -D INPUT      -j luci_splash_counter
+	silent iptables -t filter -D FORWARD    -j luci_splash_counter
+	silent iptables -t mangle -D PREROUTING -j luci_splash_mark
+        
 	### Clear subchains
-	iptables -t nat -F luci_splash_leases
-	iptables -t nat -F luci_splash_portal
-	iptables -t nat -F luci_splash_prerouting
-	iptables -F luci_splash_counter
-
+	silent iptables -t nat    -F luci_splash_leases
+	silent iptables -t nat    -F luci_splash_portal
+	silent iptables -t nat    -F luci_splash_prerouting
+	silent iptables -t filter -F luci_splash_counter
+	silent iptables -t mangle -F luci_splash_mark
+	
 	### Delete subchains
-	iptables -t nat -X luci_splash_leases
-	iptables -t nat -X luci_splash_portal
-	iptables -t nat -X luci_splash_prerouting
-	iptables -X luci_splash_counter
+	silent iptables -t nat    -X luci_splash_leases
+	silent iptables -t nat    -X luci_splash_portal
+	silent iptables -t nat    -X luci_splash_prerouting
+	silent iptables -t filter -X luci_splash_counter
+	silent iptables -t mangle -X luci_splash_mark
+
+	### Stop the splash httpd
+	start-stop-daemon -K -p /var/run/luci-splashd.pid -s KILL -q
 	
 	sed -ie '/\/usr\/sbin\/luci-splash sync/d' /var/spool/cron/crontabs/root
 }
diff --git a/applications/luci-splash/root/usr/sbin/luci-splash b/applications/luci-splash/root/usr/sbin/luci-splash
index 3f6356a9b3..e2bcc557d2 100755
--- a/applications/luci-splash/root/usr/sbin/luci-splash
+++ b/applications/luci-splash/root/usr/sbin/luci-splash
@@ -8,11 +8,25 @@ require("luci.sys.iptparser")
 local uci = luci.model.uci.cursor_state()
 local ipt = luci.sys.iptparser.IptParser()
 
+local splash_interfaces = { }
+local limit_up = 0
+local limit_down = 0
+local limit_down_burst = 0
 
 function main(argv)
 	local cmd = argv[1]
 	local arg = argv[2]
+
+	limit_up = tonumber(uci:get("luci_splash", "general", "limit_up") or 0)
+	limit_down = tonumber(uci:get("luci_splash", "general", "limit_down") or 0)
+	limit_down_burst = tonumber(uci:get("luci_splash", "general", "limit_down_burst") or limit_down * 2)
 	
+	uci:foreach("luci_splash", "iface", function(s)
+		if s.network then
+			splash_interfaces[#splash_interfaces+1] = uci:get("network", s.network, "ifname")
+		end
+	end)
+
 	if cmd == "status" and arg then
 		if islisted("whitelist", arg) then
 			print("whitelisted")
@@ -75,29 +89,51 @@ end
 
 -- Add an iptables rule
 function add_rule(mac)
-	os.execute("iptables -I luci_splash_counter -m mac --mac-source '"..mac.."' -j RETURN")
-	return os.execute("iptables -t nat -I luci_splash_leases -m mac --mac-source '"..mac.."' -j RETURN")
+	local a, b, c, d, e, f = mac:match("(%w+):(%w+):(%w+):(%w+):(%w+):(%w+)")
+	local mac_pre  = "%s%s" %{ a, b }
+	local mac_post = "%s%s%s%s" %{ c, d, e, f }
+	local handle   = f
+
+	if limit_up > 0 and limit_down > 0 then
+		os.execute("iptables -t mangle -I luci_splash_mark -m mac --mac-source %q -j MARK --set-mark 79" % mac)
+
+		for _, i in ipairs(splash_interfaces) do
+			os.execute("tc filter add dev %q parent 77:0 protocol ip prio 2 " % i .. 
+				"handle ::%q u32 " % handle ..
+				"match u16 0x0800 0xFFFF at -2 match u32 0x%q 0xFFFFFFFF at -12 " % mac_post ..
+				"match u16 0x%q 0xFFFF at -14 flowid 77:10" % mac_pre)
+		end
+	end
+
+	os.execute("iptables -t filter -I luci_splash_counter -m mac --mac-source %q -j RETURN" % mac)
+	return os.execute("iptables -t nat -I luci_splash_leases -m mac --mac-source %q -j RETURN" % mac)
 end
 
 
 -- Remove an iptables rule
 function remove_rule(mac)
-	for _, r in ipairs(ipt:find({table="filter", chain="luci_splash_counter"})) do
-		if r.options and #r.options >= 2 and r.options[1] == "MAC" and
-		   r.options[2]:lower() == mac:lower()
-		then
-			os.execute("iptables -D luci_splash_counter -m mac --mac-source %q -j %s"
-				%{ mac, r.target })
+	local handle = mac:match("%w+:%w+:%w+:%w+:%w+:(%w+)")
+
+	local function ipt_delete_foreach(args)
+		for _, r in ipairs(ipt:find(args)) do
+			if r.options and #r.options >= 2 and r.options[1] == "MAC" and
+			   r.options[2]:lower() == mac:lower()
+			then
+				os.execute("iptables -t %q -D %q -m mac --mac-source %q %s 2>/dev/null"
+					%{ r.table, r.chain, mac,
+						r.target == "MARK" and "-j MARK --set-mark 79" or
+							r.target and "-j %q" % r.target or "" })
+			end
 		end
 	end
 
-	for _, r in ipairs(ipt:find({table="nat", chain="luci_splash_leases"})) do
-		if r.options and #r.options >= 2 and r.options[1] == "MAC" and
-		   r.options[2]:lower() == mac:lower()
-		then
-			os.execute("iptables -t nat -D luci_splash_leases -m mac --mac-source %q -j %s"
-				%{ mac, r.target })
-		end
+	ipt_delete_foreach({table="filter", chain="luci_splash_counter"})
+	ipt_delete_foreach({table="mangle", chain="luci_splash_mark"})
+	ipt_delete_foreach({table="nat", chain="luci_splash_leases"})
+
+	for _, i in ipairs(splash_interfaces) do
+		os.execute("tc filter del dev %q parent 77:0 protocol ip prio 2 " % i .. 
+			"handle 800::%q u32 2>/dev/null" % handle)
 	end
 
 	ipt:resync()
@@ -169,7 +205,7 @@ function sync()
 		if v[".type"] == "lease" then
 			if os.difftime(time, tonumber(v.start)) > leasetime then
 				-- Remove expired
-				remove_rule(v.mac)
+				remove_rule(v.mac, v.kicked)
 			else
 				-- Rewrite state
 				uci:section("luci_splash", "lease", nil, {