Tom Eastep 2012 Thomas M. Eastep Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover, and with no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

This configuration was inspired by the one in this thread on the OpenWRT Forum: https://forum.openwrt.org/viewtopic.php?pid=154533#p154533. The configuration has been adapted to Shorewall 4.5.6 with the following changes: The configuration uses an IFB, yet only uses firewall marks in the OUTPUT and FORWARD chains to classify packets; clearly that doesn't work To be more precise, it doesn't work with an unpatched kernel. The OpenWRT script assumes an 'act_conntrack' patch which performs conntrack processing on packets before they are sent to the IFB. That patch is not generally available. The configuration presented here uses U32 classifiers (shorewall-tcfilters(5)) to classify traffic for download shaping and uses the POSTROUTING chain for upload shaping. The sample uses a weak form of P2P classification; the one presented below uses IPP2P. The OpenWRT script assumed that the uplink was ATM -- the one below makes no assumption (it specifies 'ethernet' with overhead '0').

The shell variables set in the OpenWRT script are set in the Shorewall params file: # local network MYNET=192.168.0.0/24 DOWNLOAD=40000 #download speed in kbit. set xx% of real download speed UPLOAD=7000 # set xx% of real upload speed # multiports = up to 15 ports # ports to be classified as bulk #set after connection mark save and after connection mark restore TCP_BULK="1024:" #S and D ports UDP_BULK="1024:" #S and D ports # Destination ports to be classified as P2P TCP_P2P="13769" #D ports UDP_P2P="13769" #D ports IP_P2P="192.168.0.133" # Destination ports to be classified as normal TCP_NORMAL="80,443,25,20,21,110,993,995" # D ports UDP_NORMAL="" # Destination ports to be classified as Prio (overules bulk ports) TCP_PRIO="22,53" #destination ports UDP_PRIO="22,53" #destination ports # Destination ports to be classified as VoIP (overules bulk ports) TCP_VOIP="" UDP_VOIP="18080" IP_VOIP="192.168.0.226" #destination and source IP IP_VOIP="192.168.0.226" #destination and source IP #!!!!!uplink leaf class parameters!!!!!!!!! #bulk UP_LS_BULK_RATE=$(($UPLOAD*5/100)) UP_UL_BULK_RATE=$UPLOAD #settings leaf qdisc UP_BULK_RED_PROB=0.05 #red drob probability UP_BULK_RED_min=6250 #real limit. To limit BULK traffic UP_BULK_RED_min2=6250 #min for doing the calculations (burst and etc) UP_BULK_RED_max=$((2 * $UP_BULK_RED_min2 + $UP_BULK_RED_min)) UP_BULK_RED_burst=$(((5 * $UP_BULK_RED_min2) / (3 * 1000))) UP_BULK_RED_limit=$(($UP_BULK_RED_max * 5)) #P2P UP_LS_P2P_RATE=$(($UPLOAD * 5 / 100)) UP_UL_P2P_RATE=$UPLOAD #settings leaf qdisc UP_P2P_RED_PROB=0.05 #red drob probability UP_P2P_RED_min=32000 #real limit. To limit P2P traffic UP_P2P_RED_min2=32000 #min for doing the calculations (burst and etc) UP_P2P_RED_max=$((5 * $UP_P2P_RED_min2 + $UP_P2P_RED_min)) UP_P2P_RED_burst=$(((5 * $UP_P2P_RED_min2) / (3 * 1000))) UP_P2P_RED_limit=$(($UP_P2P_RED_max * 5)) #normal class UP_LS_NORMAL_RATE=$(($UPLOAD * 40 / 100)) UP_UL_NORMAL_RATE=$UPLOAD #settings leaf qdisc UP_NORMAL_RED_PROB=0.05 #red drob probability UP_NORMAL_RED_min=6250 #real limit. To limit NORMAL traffic UP_NORMAL_RED_min2=6250 #min for doing the calculations (burst and etc) UP_NORMAL_RED_max=$((2 * $UP_NORMAL_RED_min2 + $UP_NORMAL_RED_min)) UP_NORMAL_RED_burst=$(((5 * $UP_NORMAL_RED_min2) / (3 * 1000))) UP_NORMAL_RED_limit=$(($UP_NORMAL_RED_max * 5)) #prio UP_LS_PRIO_RATE=$(($UPLOAD*50/100)) UP_RT_PRIO_RATE="200" #rate in kbit UP_RT_PRIO_UMAX="400" #lengte of the packets [byte] UP_RT_PRIO_DMAX="15" #delay in ms UP_UL_PRIO_RATE=$UPLOAD #Voip UP_UL_VOIP_RATE=$UPLOAD UP_SC_VOIP_RATE="200" UP_SC_VOIP_UMAX="350" #length of the voip packets [byte] UP_SC_VOIP_DMAX="10" #delay in ms #bulk DOWN_LS_BULK_RATE=$(($DOWNLOAD*5/100)) DOWN_UL_BULK_RATE=$DOWNLOAD #leaf qdisc parameters DOWN_BULK_RED_PROB=0.05 #red drob probability DOWN_BULK_RED_min=62500 #real limit. To limit BULK traffic DOWN_BULK_RED_min2=62500 #min for doing the calculations (burst and etc) DOWN_BULK_RED_max=$((2 * $DOWN_BULK_RED_min2 + $DOWN_BULK_RED_min)) DOWN_BULK_RED_burst=$(((5 * $DOWN_BULK_RED_min2) / (3 * 1000))) DOWN_BULK_RED_limit=$(($DOWN_BULK_RED_max * 5)) #P2P DOWN_LS_P2P_RATE=$(($DOWNLOAD*5/100)) DOWN_UL_P2P_RATE=4000 #leaf qdisc parameters DOWN_P2P_RED_PROB=0.05 #red drob probability DOWN_P2P_RED_min=200000 #real limit. To limit P2P traffic DOWN_P2P_RED_min2=200000 #min for doing the calculations (burst and etc) DOWN_P2P_RED_max=$((2 * $DOWN_P2P_RED_min2 + $DOWN_P2P_RED_min)) DOWN_P2P_RED_burst=$(((5 * $DOWN_P2P_RED_min2) / (3 * 1000))) DOWN_P2P_RED_limit=$(($DOWN_P2P_RED_max * 5)) #normal class DOWN_LS_NORMAL_RATE=$(($DOWNLOAD*75/100)) DOWN_UL_NORMAL_RATE=$DOWNLOAD #leaf qdisc parameters DOWN_NORMAL_RED_PROB=0.05 #red drob probability DOWN_NORMAL_RED_min=62500 #real limit. To limit NORMAL traffic DOWN_NORMAL_RED_min2=62500 #min for doing the calculations (burst and etc) DOWN_NORMAL_RED_max=$((2 * $DOWN_NORMAL_RED_min2 + $DOWN_NORMAL_RED_min)) DOWN_NORMAL_RED_burst=$(((5 * $DOWN_NORMAL_RED_min2) / (3 * 1000))) DOWN_NORMAL_RED_limit=$(($DOWN_NORMAL_RED_max * 5)) #prio DOWN_RT_PRIO_RATE="500" #rate in kbit DOWN_RT_PRIO_UMAX="400" #length of the packets [byte]/ DOWN_RT_PRIO_DMAX="1.5" #delay in ms DOWN_UL_PRIO_RATE=$DOWNLOAD #Voip DOWN_UL_VOIP_RATE=$DOWNLOAD DOWN_SC_VOIP_RATE="250" DOWN_SC_VOIP_UMAX="350" #lengt of voip packets [byte] DOWN_SC_VOIP_DMAX="1.2" #delay in ms

The init file loads the ifb module, creating a single device: modprobe ifb numifbs=1 ip link set ifb0 up

The tcdevices file describes the two devices: #NUMBER: IN_BANDWITH OUT_BANDWIDTH OPTIONS REDIRECT 1:eth0 - ${UPLOAD}kbit hfsc,linklayer=ethernet,overhead=0 2:ifb0 - ${DOWNLOAD}kbit hfsc eth0

The tcclasses file defines the class hierarchy for both devices: #INTERFACE MARK RATE CEIL PRIORITY OPTIONS 1 1 ${UP_SC_VOIP_RATE}kbit:\ ${UP_SC_VOIP_DMAX}:\ ${UP_SC_VOIP_UMAX} ${UP_UL_VOIP_RATE}kbit 1 1 2 ${UP_RT_PRIO_RATE}kbit:\ ${UP_RT_PRIO_DMAX}:\ ${UP_RT_PRIO_UMAX} ${UP_LS_PRIO_RATE}kbit:\ ${UP_UL_PRIO_RATE}kbit 1 1 3 - ${UP_LS_NORMAL_RATE}kbit:\ ${UP_UL_NORMAL_RATE}kbit 1 red=(limit=$UP_NORMAL_RED_limit,\ min=$UP_NORMAL_RED_min,\ max=$UP_NORMAL_RED_max,\ burst=$UP_NORMAL_RED_burst,\ probability=$UP_NORMAL_RED_PROB,\ ecn) 1 4 - ${UP_LS_P2P_RATE}kbit:\ ${UP_UL_P2P_RATE}kbit 1 red=(limit=$UP_P2P_RED_limit,\ min=$UP_P2P_RED_min,\ max=$UP_P2P_RED_max,\ burst=$UP_P2P_RED_burst,\ probability=$UP_P2P_RED_PROB,\ ecn) 1 5 - ${UP_LS_BULK_RATE}kbit:\ ${UP_UL_BULK_RATE}kbit 1 default,\ red=(limit=$UP_BULK_RED_limit,\ min=$UP_BULK_RED_min,\ max=$UP_BULK_RED_max,\ burst=$UP_BULK_RED_burst,\ probability=$UP_BULK_RED_PROB,\ ecn) 2:10 - ${UP_SC_VOIP_RATE}kbit:\ ${UP_SC_VOIP_DMAX}:\ ${UP_SC_VOIP_UMAX} ${UP_UL_VOIP_RATE}kbit 1 2:20 - ${DOWN_RT_PRIO_RATE}kbit:\ ${DOWN_RT_PRIO_DMAX}:\ ${DOWN_RT_PRIO_UMAX} ${DOWN_UL_PRIO_RATE}kbit 1 2:30 - - ${DOWN_LS_NORMAL_RATE}kbit:\ ${DOWN_UL_NORMAL_RATE}kbit 1 red=(limit=$DOWN_NORMAL_RED_limit,\ min=$DOWN_NORMAL_RED_min,\ max=$DOWN_NORMAL_RED_max,\ burst=$DOWN_NORMAL_RED_burst,\ probability=$DOWN_NORMAL_RED_PROB) 2:40 - - ${DOWN_LS_P2P_RATE}kbit:\ ${DOWN_UL_P2P_RATE}kbit 1 red=(limit=$DOWN_P2P_RED_limit,\ min=$DOWN_P2P_RED_min,\ max=$DOWN_P2P_RED_max,\ burst=$DOWN_P2P_RED_burst,\ probability=$DOWN_P2P_RED_PROB) 2:50 - - ${DOWN_LS_BULK_RATE}kbit:\ ${DOWN_UL_BULK_RATE}kbit 1 default,\ red=(limit=$DOWN_BULK_RED_limit,\ min=$DOWN_BULK_RED_min,\ max=$DOWN_BULK_RED_max,\ burst=$DOWN_BULK_RED_burst,\ probability=$DOWN_BULK_RED_PROB)

The mangle file classifies upload packets: #MARK SOURCE DEST PROTO DPORT SPORT USER TEST RESTORE:T - - - - - - !0:C CONTINUE:T - - - - - - !0 2:T - - icmp 1:T - - udp $UDP_VOIP - - 0 1:T $IP_VOIP - - - - - 0 1:T - $IP_VOIP - - - - 0 2:T - - tcp $TCP_PRIO - - 0 2:T - - udp $UDP_PRIO - - 0 2:T - - tcp - $TCP_PRIO - 0 2:T - - udp - $UDP_PRIO - 0 3:T - - tcp $TCP_NORMAL - - 0 4:T - - ipp2p:all - - - 0 5:T - - tcp $TCP_BULK - - 0 5:T - - tcp - $TCP_BULK - 0 5:T - - udp $UDP_BULK - - 0 5:T - - udp - $UDP_BULK - 0 SAVE:T - - - - - - !0

The tcfilters file classifies download packets: #INTERFACE: SOURCE DEST PROTO DPORT SPORT TOS LENGTH # # These classify download traffic # 2:10 - $MYNET udp - $UDP_VOIP 2:20 - $MYNET tcp - $TCP_PRIO 2:20 - $MYNET udp - $UDP_PRIO 2:20 - $MYNET tcp $TCP_PRIO 2:20 - $MYNET udp $UDP_PRIO 2:30 - $MYNET tcp - $TCP_NORMAL 2:50 - $MYNET tcp $TCP_BULK 2:50 - $MYNET tcp - $TCP_BULK 2:50 - $MYNET udp $UDP_BULK 2:50 - $MYNET tcp - $UDP_BULK