#! /bin/sh

# tcstart from tc4shorewall       Version 0.5
# (c) 2005 Arne Bernin <arne@ucbering.de>
# published under GPL Version 2


if [ -z "$COMMAND" ]; then
	SHOREWALL_DIR=.
	SHARED_DIR=/usr/share/shorewall
	FUNCTIONS=$SHARED_DIR/functions

	. $FUNCTIONS

elif [ "$COMMAND" = restore ]; then
        cd /etc/shorewall
	SHOREWALL_DIR=.
fi

if [ -z "$COMMAND" -o "$COMMAND" = restore ]; then
	run_tc() { tc $@; }
	fatal_error() { echo "   ERROR: $@" >&2; exit 2; }
	TMP_DIR=
	TMP_DIR=$(mktempdir)
fi

setup_traffic_shaping()
{
	local mtu r2q tc_all_devices device mark rate ceil prio options
	mtu=1500
	r2q=10

	rate_to_kbit() {
		local rateunit rate
		rate=$1
		rateunit=$( echo $rate | sed -e 's/[0-9]*//')
		rate=$( echo $rate | sed -e 's/[a-z]*//g')

		case $rateunit in
			kbit)
				rate=$rate
				;;
			mbit)
				rate=$(expr $rate \* 1024)
				;;
			mbps)
				rate=$(expr $rate \* 8192)
				;;
			kbps)
				rate=$(expr $rate \* 8)
				;;
			*)
				rate=$(expr $rate / 128)
				;;
		esac
		echo $rate
	}

	calculate_quantum() {
		local rate
		rate=$1
		rate=$(rate_to_kbit $rate)
		rate=$(expr $rate \* 128 / $r2q )
		if [ $rate -lt $mtu ] ; then
			echo $mtu
		else
			echo $rate
		fi
	}

	# get given outbandwidth for device
	get_outband_for_dev() {
		local device inband outband
       		while read device inband outband; do
	    		expandv device inband outband
            		tcdev="$device $inband $outband"
	    		if [ "$1" = "$device" ] ; then
	    			echo $outband
	    			return
	    		fi
      		done < $TMP_DIR/tcdevices
	}

	check_tcclasses_options() {
		while [ $# -gt 1 ]; do
        		shift
			case $1 in
				default|tcp-ack|tos-minimize-delay|tos-maximize-throughput|tos-maximize-reliability|tos-minimize-cost|tos-normal-service)
				;;
				*)
				echo $1
				return 1		
				;;
			esac
    		done
		return 0
	}	

	get_defmark_for_dev() {
		local searchdev searchmark device ceil prio options
		searchdev=$1
	
	        while read device mark rate ceil prio options; do
		expandv device mark rate ceil prio options
		options=$(separate_list $options | tr '[A-Z]' '[a-z]')
            	tcdev="$device $mark $rate $ceil $prio $options"
	    	if [ "$searchdev" = "$device" ] ; then
	    		list_search "default" $options && echo $mark &&return 0
		fi
        	done < $TMP_DIR/tcclasses

		return 1
	}

	check_defmark_for_dev() {
		get_defmark_for_dev $1 >/dev/null
	}

	validate_tcdevices_file() {
		echo "Validating tcdevices file..."
		local device local device inband outband
	        while read device inband outband; do
		    	expandv device inband outband
       	    		tcdev="$device $inband $outband"
	    		check_defmark_for_dev $device || fatal_error "Option default is not defined for any class in tcclasses for interface $device" 
            		case $interface in
                        	*:*|+)
                               		fatal_error "Invalid Interface Name: $interface"
                               		;;
			esac 
            		list_search $device $devices && fatal_error "Interface $device is defined more than once in tcdevices"
            		tc_all_devices="$tc_all_devices $device"  	          
           	done < $TMP_DIR/tcdevices
	}

	validate_tcclasses_file() {
		echo "Validating tcclasses file..."
		local classlist device mark rate ceil prio bandw wrongopt allopts opt
		allopts=""
        	while read device mark rate ceil prio options; do
	    		expandv device mark rate ceil prio options
            		tcdev="$device $mark $rate $ceil $prio $options"
	    		ratew=$(get_outband_for_dev $device)
			options=$(separate_list $options | tr '[A-Z]' '[a-z]')
			for opt in $options; do
				list_search "$device-$opt" $allopts && fatal_error "option $opt already defined in a chain for interface $device in tcclasses"
				allopts="$allopts $device-$opt"
			done
			wrongopt=$(check_tcclasses_options $options) || fatal_error "unknown option $wrongopt for class iface $device mark $mark in tcclasses file" 
			if [ -z "$ratew" ] ; then
	    			fatal_error "device $device seems not to be configured in tcdevices"
	    		fi	   
	    		list_search "$device-$mark" $classlist && fatal_error "Mark $mark for interface $device defined more than once in tcclasses" 
	    		classlist="$classlist $device-$mark"
         		done < $TMP_DIR/tcclasses
	}



	add_root_tc() {
		local defmark
		defmark=$(get_defmark_for_dev $device)
		tc qdisc del dev $device root 2>/dev/null  > /dev/null
		tc qdisc del dev $device ingress 2>/dev/null > /dev/null
		run_tc qdisc add dev $device root handle 1: htb default 1$defmark
		run_tc class add dev $device parent 1: classid 1:1 htb rate $outband 
		run_tc qdisc add dev $device handle ffff: ingress
		run_tc filter add dev $device parent ffff: protocol ip prio 50 u32 match ip src 0.0.0.0/0 police rate ${inband} burst 10k drop flowid :1
	}

	add_tc_class() {
		local full
		#set -x
		full=$(get_outband_for_dev $device)
		full=$(rate_to_kbit $full)
		#set -x
		if [ -z "$prio" ] ; then
			prio=1
		fi
		
		case $rate in
			*full*)
				rate=$(echo $rate | sed -e "s/full/$full/")
				rate="$(($rate))kbit"	
				;;
		esac

		case $ceil in
			*full*)
				ceil=$(echo $ceil | sed -e "s/full/$full/")
                		ceil="$(($ceil))kbit"
				;;
		esac
		#set +x
	
		run_tc class add dev $device parent 1:1 classid 1:1$mark htb rate $rate ceil $ceil prio $prio quantum $(calculate_quantum $rate)
		run_tc qdisc add dev $device parent 1:1$mark handle 1$mark: sfq perturb 10
		# add filters
		run_tc filter add dev $device protocol ip parent 1:0 prio 1 handle $mark fw classid 1:1$mark
		# options
		list_search "tcp-ack" $options && run_tc filter add dev $device parent 1:0 protocol ip prio 10 u32 match ip protocol 6 0xff match u8 0x05 0x0f at 0 match u16 0x0000 0xffc0 at 2 match u8 0x10 0xff at 33 flowid 1:1$mark
		list_search "tos-minimize-delay" $options && run_tc filter add dev $device parent 1:0 protocol ip prio 10 u32 match ip tos 0x10 0xff flowid 1:1$mark
		list_search "tos-minimize-cost" $options && run_tc filter add dev $device parent 1:0 protocol ip prio 10 u32 match ip tos 0x02 0xff flowid 1:1$mark
		list_search "tos-maximize-troughput" $options && run_tc filter add dev $device parent 1:0 protocol ip prio 10 u32 match ip tos 0x08 0xff flowid 1:1$mark
		list_search "tos-minimize-reliability" $options && run_tc filter add dev $device parent 1:0 protocol ip prio 10 u32 match ip tos 0x04 0xff flowid 1:1$mark
		list_search "tos-normal-service" $options && run_tc filter add dev $device parent 1:0 protocol ip prio 10 u32 match ip tos 0x00 0xff flowid 1:1$mark
		# tcp
		set +x
	}

	strip_file tcdevices
	strip_file tcclasses

	validate_tcdevices_file
	validate_tcclasses_file

	if [ -s $TMP_DIR/tcdevices ]; then
        	echo "Processing tcdevices..."

        	while read device inband outband defmark ackmark; do
	    		expandv device inband outband defmark ackmark
            		tcdev="$device $inband $outband"
	   		add_root_tc
			progress_message "   TC Device $tcdev Added." 
      		done < $TMP_DIR/tcdevices
	fi

	if [ -s $TMP_DIR/tcclasses ]; then
        	echo "Processing tcclasses..."

        	while read device mark rate ceil prio options; do
	    		expandv device mark rate ceil prio options
            		tcdev="$device $mark $rate $ceil $prio $options"
			options=$(separate_list $options | tr '[A-Z]' '[a-z]')
	    		add_tc_class
			progress_message "   TC Class \"$tcdev\" Added." 
      			done < $TMP_DIR/tcclasses
	fi

}

setup_traffic_shaping

[ -n "$COMMAND" ] || rm -rf $TMP_DIR