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#!/sbin/runscript
#
###########################################################################################################
# Traffic Control startup script
#
# Copyright (c) 2009 iilluzion
#
# Distributed under GPL-2
###########################################################################################################

PROGRAM=$SVCNAME
CONFIG=/etc/conf.d/$SVCNAME
DEBUG=0 #1

extra_started_commands="describe"
extra_stopped_commands="compile"

###########################################################################################################
#
#
depend() 
{
	need net
	after firewall
}

###########################################################################################################
#
#
checkconfig() {
	if [ ! -e $CONFIG ] ; then
		eerror "You need to create $CONFIG first."
	return 1
	fi
}

###########################################################################################################
#
#
bits()
{
        RATE=0
        R_RATE=$1

        R_NUMBER=`echo "$R_RATE" | sed -e "s/[^0-9]//g"`
        R_UNIT=`echo "$R_RATE" | sed -e "s/[0-9]//g"`

        if [ "$R_UNIT" == "" ]; then
                R_UNIT="kbit"
        fi

        if [ "$R_UNIT" == "kbps" ]; then   R_RATE=$(($R_NUMBER * 1024 * 8))
        elif [ "$R_UNIT" == "mbps" ]; then R_RATE=$(($R_NUMBER * 1024 * 1024 * 8))
        elif [ "$R_UNIT" == "mbit" ]; then R_RATE=$(($R_NUMBER * 1024 * 1024))
        elif [ "$R_UNIT" == "kbit" ]; then R_RATE=$(($R_NUMBER * 1024))
        elif [ "$R_UNIT" == "bps" ]; then  R_RATE=$(($R_NUMBER * 8))
        else
                echo "Unknown unit '$R_UNIT' (mbps, mbit, kbit, kbps, bps)"
        fi

        echo "$R_RATE"
}

###########################################################################################################
#
#
expand_leaf_qdisc()
{
	case "$1" in
		pfifo)	echo "pfifo limit 5";;
		sfq)	echo "sfq perturb 10";;
		red)	echo "red min $RED_MIN max $RED_MAX burst $RED_BURST limit $RED_LIMIT probability $RED_PROB avpkt $RED_AVPKT";;
	esac
}

###########################################################################################################
#
#
configure()
{
	if [ ! -z $1 ]; then
		eval WAN_RATE="\$$1"_RATE
			WAN_RATE=`bits $WAN_RATE`

		# Calculaton of WAN classes rates
		WAN_SUB_RATE=$((WAN_RATE - (RATE_SUB_PERCENT * WAN_RATE / 100)))
			INTERACTIVE_RATE=$((WAN_SUB_RATE / 5))
		if [ $INTERACTIVE_RATE -lt 75000 ]; then
			INTERACTIVE_RATE=75000
			PRIVILEGED_RATE=$(((WAN_SUB_RATE - 75000) / 2))
			BESTEFFORT_RATE=$(((WAN_SUB_RATE - 75000) / 2))
		else
			PRIVILEGED_RATE=$((WAN_SUB_RATE / 2))
			BESTEFFORT_RATE=$((WAN_SUB_RATE / 3))
		fi

		DEV_RATE=${DEV_RATE:-$EGRESS_RATE}
			DEV_RATE=`bits $DEV_RATE`
				if [ $DEV_RATE -lt $WAN_RATE ]; then
					DEV_RATE=$WAN_RATE
				fi
		OUT_OF_WAN_RATE=$((DEV_RATE - WAN_RATE))

		# Calculation of Queuing Discipline parameters
		INTERACTIVE_PRIO_LATENCY=50000
		INTERACTIVE_PRIO_BURST=$((INTERACTIVE_RATE / 100 / 8))

		INTERACTIVE_HFSC_DMAX=50000
		INTERACTIVE_HFSC_UMAX=1500

		PRIVILEGED_HFSC_DMAX=100000
		PRIVILEGED_HFSC_UMAX=1500

		# Random Early Detect (RED) parameters calculation:
		#  min         = maximum delay * rate (dalay ~ 200ms = 0.2sec) [b]
		#  max         = 3 * min [b]
		#  avpkt       = 1000 (MTU 1500)
		#  limit       = 8 * max [b]
		#  burst       = (min + min + max)/(3 * avpkt) [b]
		#  probability = 0.02

		RED_DELAY=200
		RED_MIN=$((RED_DELAY * BESTEFFORT_RATE / 1000 / 8)) # devided on 8 since rate given in bit/s so we get bytes
		RED_MAX=$((3 * RED_MIN))
		RED_AVPKT=1000
		RED_PROB=0.02
		RED_BURST=$(((RED_MIN + RED_MIN + RED_MAX) / (3 * RED_AVPKT)))
		RED_LIMIT=$((8 * RED_MAX))

		# Setting leaf Queuing Disciplines parameters
		INTERACTIVE_LEAF_QDISC=pfifo
			INTERACTIVE_LEAF_QDISC=`expand_leaf_qdisc $INTERACTIVE_LEAF_QDISC`
		PRIVILEGED_LEAF_QDISC=pfifo
			PRIVILEGED_LEAF_QDISC=`expand_leaf_qdisc $PRIVILEGED_LEAF_QDISC`
		
		# Force using SFQ in case rate is less than 2mbit	
		if [ $BESTEFFORT_RATE -lt 2097152 ]; then
			BESTEFFORT_LEAF_QDISC=sfq
		fi
		BESTEFFORT_LEAF_QDISC=`expand_leaf_qdisc $BESTEFFORT_LEAF_QDISC`

		LAN_LEAF_QDISC=sfq
		LAN_LEAF_QDISC=`expand_leaf_qdisc $LAN_LEAF_QDISC`
	fi
}

###########################################################################################################
#
#
reset()
{
	# Supported Queuing Disciplines
	QDISCS="prio|tbf|htb|hfsc|sfq|red|pfifo"

	tc qdisc show dev $DEV | grep -v "pfifo_fast" | egrep -q "$QDISCS" && $ECHO tc qdisc del dev $DEV root
	tc qdisc show dev $DEV | grep -v "pfifo_fast" | grep  -q ingress && $ECHO tc qdisc del dev $DEV ingress

	if [ "$INGRESS_ALG" = "ifb" ] && [ ! -z $IFB_DEV ]; then 
		$ECHO ip link set dev $IFB_DEV down
	fi
}

###########################################################################################################
#
#
set_leaf_qdisc()
{
	PARENT_CLASSID=$1
		PARENT_CLASSID=${PARENT_CLASSID:-1}

	if [ ! "$QDISC_CMD" = "prio" ]; then 
		$ECHO tc qdisc add dev $DEV parent $PARENT_CLASSID:40 handle 40 $INTERACTIVE_LEAF_QDISC
	fi

	$ECHO tc qdisc add dev $DEV parent $PARENT_CLASSID:50 handle 50 $PRIVILEGED_LEAF_QDISC
	$ECHO tc qdisc add dev $DEV parent $PARENT_CLASSID:60 handle 60 $BESTEFFORT_LEAF_QDISC

	if [ $OUT_OF_WAN_RATE -gt 0 ]; then
		$ECHO tc qdisc add dev $DEV parent $PARENT_CLASSID:70 handle 70 $LAN_LEAF_QDISC
	fi

	$ECHO
}

###########################################################################################################
#
#
set_filters()
{
	CLASS_TYPES="INTERACTIVE PRIVILEGED BESTEFFORT"
		if [ $OUT_OF_WAN_RATE -gt 0 ]; then
			CLASS_TYPES=$CLASS_TYPES" LAN"
		fi

		PRIVILEGED_FILTER_FLOWID=50
		BESTEFFORT_FILTER_FLOWID=60
		LAN_FILTER_FLOWID=70

	{
		for CLASS_TYPE in $CLASS_TYPES; do
			if [ "$QDISC_CMD" = "prio" -a "$CLASS_TYPE" = "INTERACTIVE" ]; then
				PARENT_CLASSID=1
				INTERACTIVE_FILTER_FLOWID=1
			else
				PARENT_CLASSID=$1
					PARENT_CLASSID=${PARENT_CLASSID:-1}
				INTERACTIVE_FILTER_FLOWID=40
			fi

			for FILTER_NUM in `seq 1 100`; do
				eval FILTER="\$$CLASS_TYPE"_FILTER_$FILTER_NUM
				if [ ! -z "$FILTER" ]; then
					eval FILTER_FLOWID="\$$CLASS_TYPE"_FILTER_FLOWID
						$ECHO tc filter add dev $DEV parent $PARENT_CLASSID:0 $FILTER flowid $PARENT_CLASSID:$FILTER_FLOWID
				fi
			done
		done
	} | sort -g

	$ECHO
}

###########################################################################################################
#
#
set_htb()
{
	$ECHO tc qdisc add dev $DEV root handle 1 htb default 60
		$ECHO tc class add dev $DEV parent 1: classid 1:2 htb rate $DEV_RATE burst $(($DEV_RATE*5/4))
			$ECHO tc class add dev $DEV parent 1:2 classid 1:30 htb rate $WAN_SUB_RATE burst $(($WAN_SUB_RATE*5/4))
				$ECHO tc class add dev $DEV parent 1:30 classid 1:40 htb rate $INTERACTIVE_RATE ceil $WAN_SUB_RATE prio 1
				$ECHO tc class add dev $DEV parent 1:30 classid 1:50 htb rate $PRIVILEGED_RATE ceil $WAN_SUB_RATE prio 3 burst $(($WAN_SUB_RATE*5/4))
				$ECHO tc class add dev $DEV parent 1:30 classid 1:60 htb rate $BESTEFFORT_RATE ceil $WAN_SUB_RATE prio 6 burst $(($WAN_SUB_RATE*5/4))

				if [ $OUT_OF_WAN_RATE -gt 0 ]; then
					$ECHO tc class add dev $DEV parent 1:2 classid 1:70 htb rate $OUT_OF_WAN_RATE prio 7
				fi
	
	set_leaf_qdisc

	$ECHO

	set_filters
}

###########################################################################################################
#
#
set_hfsc()
{
	$ECHO tc qdisc add dev $DEV root handle 1 hfsc default 60
		$ECHO tc class add dev $DEV parent 1: classid 1:2 hfsc sc rate $DEV_RATE ul rate $DEV_RATE
			$ECHO tc class add dev $DEV parent 1:2 classid 1:30 hfsc sc rate $WAN_SUB_RATE ul rate $WAN_SUB_RATE
				$ECHO tc class add dev $DEV parent 1:30 classid 1:40 hfsc sc umax $INTERACTIVE_HFSC_UMAX dmax $INTERACTIVE_HFSC_DMAX rate $INTERACTIVE_RATE ul rate $WAN_SUB_RATE
				$ECHO tc class add dev $DEV parent 1:30 classid 1:50 hfsc sc umax $PRIVILEGED_HFSC_UMAX dmax $PRIVILEGED_HFSC_DMAX rate $PRIVILEGED_RATE ul rate $WAN_SUB_RATE
				$ECHO tc class add dev $DEV parent 1:30 classid 1:60 hfsc sc rate $BESTEFFORT_RATE ul rate $WAN_SUB_RATE

				if [ $OUT_OF_WAN_RATE -gt 0 ]; then
					$ECHO tc class add dev $DEV parent 1:2 classid 1:70 hfsc sc rate $OUT_OF_WAN_RATE ul rate $OUT_OF_WAN_RATE
				fi

	set_leaf_qdisc

	$ECHO

	set_filters
}

###########################################################################################################
#
#
set_prio()
{
	PARENT_CLASSID=10
	$ECHO tc qdisc add dev $DEV root handle 1 prio bands 2 priomap 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 # by default unclassified traffic goes to flowid 1:2
		$ECHO tc qdisc add dev $DEV parent 1:1 handle 40: tbf rate $INTERACTIVE_RATE burst $WAN_SUB_RATE latency $INTERACTIVE_PRIO_LATENCY
		$ECHO tc qdisc add dev $DEV parent 1:2 handle $PARENT_CLASSID: htb default 60
			$ECHO tc class add dev $DEV parent $PARENT_CLASSID: classid $PARENT_CLASSID:30 htb rate $WAN_SUB_RATE
				$ECHO tc class add dev $DEV parent $PARENT_CLASSID:30 classid $PARENT_CLASSID:50 htb rate $PRIVILEGED_RATE ceil $WAN_SUB_RATE prio 3
				$ECHO tc class add dev $DEV parent $PARENT_CLASSID:30 classid $PARENT_CLASSID:60 htb rate $BESTEFFORT_RATE ceil $WAN_SUB_RATE prio 6

				if [ $OUT_OF_WAN_RATE -gt 0 ]; then
					$ECHO tc class add dev $DEV parent 10:1 classid $PARENT_CLASSID:70 htb rate $OUT_OF_WAN_RATE prio 7
				fi

	set_leaf_qdisc $PARENT_CLASSID

	$ECHO

	set_filters $PARENT_CLASSID
}

###########################################################################################################
#
#
set_ifb()
{
	$ECHO ip link set dev $IFB_DEV up
		$ECHO tc qdisc add dev $DEV ingress handle ffff:
			$ECHO tc filter add dev $DEV parent ffff: protocol ip prio 10 u32 match u32 0 0 action mirred egress redirect dev $IFB_DEV > /dev/null 2>&1
}

###########################################################################################################
#
#
set_police()
{

# Calculation of policing bursts
#       burst = rate / 17 (taken basing on experemental results)

	POLICE_BURST_SCALE=17
	WAN_POLICE_BURST=$((WAN_RATE / POLICE_BURST_SCALE))

	WAN_POLICE_FLOWID=1

	$ECHO tc qdisc add dev $DEV handle ffff: ingress
	$ECHO tc filter add dev $DEV parent ffff: protocol ip prio 999 u32 match ip src 0.0.0.0/0 police rate $WAN_RATE burst $WAN_POLICE_BURST drop flowid :$WAN_POLICE_FLOWID
 
	$ECHO
}

###########################################################################################################
#
#
set_cpolice()
{

	# Calculation of policing bursts
	#       burst = rate / 17 (taken basing on experemental results)

	POLICE_BURST_SCALE=17
		INTERACTIVE_POLICE_BURST=$((INTERACTIVE_RATE / POLICE_BURST_SCALE))
		PRIVILEGED_POLICE_BURST=$((PRIVILEGED_RATE / POLICE_BURST_SCALE))
		BESTEFFORT_POLICE_BURST=$((BESTEFFORT_RATE / POLICE_BURST_SCALE))

	CLASS_TYPES="INTERACTIVE PRIVILEGED"
		INTERACTIVE_POLICE_FLOWID=1
		PRIVILEGED_POLICE_FLOWID=2

	$ECHO tc qdisc add dev $DEV handle ffff: ingress

	for CLASS_TYPE in $CLASS_TYPES; do
		for FILTER_NUM in `seq 1 100`; do
			eval FILTER="\$$CLASS_TYPE"_FILTER_$FILTER_NUM
				[ -z "$FILTER" ] && break
			eval FILTER_FLOWID="\$$CLASS_TYPE"_POLICE_FLOWID
			eval FILTER_RATE="\$$CLASS_TYPE"_RATE
			eval FILTER_BURST="\$$CLASS_TYPE"_POLICE_BURST
				$ECHO tc filter add dev $DEV parent ffff: $FILTER police rate $FILTER_RATE burst $FILTER_BURST continue flowid :$FILTER_FLOWID
		done
	done

	$ECHO tc filter add dev $DEV parent ffff: protocol ip prio 999 u32 match ip src 0.0.0.0/0 police rate $BESTEFFORT_RATE burst $BESTEFFORT_POLICE_BURST drop flowid :3
 
	$ECHO
}

###########################################################################################################
#
#
get_stats()
{
	echo $DEV Statistics
	echo
	echo "   Classes:"
	echo "--------------------------"
		$ECHO tc -s class show dev $DEV

	echo
	echo "   Leaf Queuing Disciplines:"
	echo "--------------------------"
		$ECHO tc -s qdisc show dev $DEV

	echo
	echo "   EGRESS Filters:"
	echo "--------------------------"
		$ECHO tc -s filter show dev $DEV
			$ECHO tc -s filter show dev $DEV parent 10: # if PRIO qdisc is applied
		
	echo
	echo "   INGRESS Policing Filters:"
	echo "--------------------------"
		$ECHO tc -s filter show dev $DEV parent ffff:

	echo
}

###########################################################################################################
#
#
compile()
{
	DEBUG=1
	
	start
}

###########################################################################################################
#
#
start()
{
	checkconfig || return 1

	if [ $DEBUG -gt 0 ]; then 
		ECHO="echo"
	else
		ebegin "Starting QoS at $DEV"
	fi

	reset

	for LINK_DIRECTION in EGRESS INGRESS; do
		configure $LINK_DIRECTION
			eval ALG_CMD="\$$LINK_DIRECTION"_ALG
				if [ ! "$ALG_CMD" = "none" ]; then
					set_$ALG_CMD
				fi
	done

	if [ $DEBUG -eq 0 ]; then
	 	eend $?
	fi
}

###########################################################################################################
#
#
stop()
{
	checkconfig || return 1

	if [ $DEBUG -gt 0 ]; then
		ECHO="echo"
	else
		ebegin "Stopping QoS at $DEV"
	fi

	reset

	if [ $DEBUG -eq 0 ]; then
		eend $?
	fi
}

###########################################################################################################
#
#
restart()
{
	stop
	start
}

###########################################################################################################
#
#
describe()
{
	checkconfig || return 1

	get_stats
}