OpenWRT SQM script for bandwidth limited class

## simple-bwlimit.qos.patch
--- simple.qos
+++ simple-bwlimit.qos
@@ -77,6 +77,7 @@
 BE_RATE=`expr $CEIL / 6`   # Min for best effort
 BK_RATE=`expr $CEIL / 6`   # Min for background
 BE_CEIL=`expr $CEIL - 16`  # A little slop at the top
+BL_RATE=`expr $CEIL / 100`

 LQ="quantum `get_mtu $IFACE $CEIL`"

@@ -87,10 +88,12 @@
 $TC class add dev $IFACE parent 1:1 classid 1:11 htb $LQ rate 128kbit ceil ${PRIO_RATE}kbit prio 1 `get_htb_adsll_string`
 $TC class add dev $IFACE parent 1:1 classid 1:12 htb $LQ rate ${BE_RATE}kbit ceil ${BE_CEIL}kbit prio 2 `get_htb_adsll_string`
 $TC class add dev $IFACE parent 1:1 classid 1:13 htb $LQ rate ${BK_RATE}kbit ceil ${BE_CEIL}kbit prio 3 `get_htb_adsll_string`
+$TC class add dev $IFACE parent 1:1 classid 1:14 htb $LQ rate ${BL_RATE}kbit prio 4 `get_htb_adsll_string`

 $TC qdisc add dev $IFACE parent 1:11 handle 110: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${PRIO_RATE}` ${EQDISC_OPTS}
 $TC qdisc add dev $IFACE parent 1:12 handle 120: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${BE_RATE}` ${EQDISC_OPTS}
 $TC qdisc add dev $IFACE parent 1:13 handle 130: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${BK_RATE}` ${EQDISC_OPTS}
+$TC qdisc add dev $IFACE parent 1:14 handle 140: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${BL_RATE}` ${EQDISC_OPTS}


 # Need a catchall rule
@@ -103,6 +106,7 @@
 $TC filter add dev $IFACE parent 1:0 protocol ip prio 1 handle 1 fw classid 1:11
 $TC filter add dev $IFACE parent 1:0 protocol ip prio 2 handle 2 fw classid 1:12
 $TC filter add dev $IFACE parent 1:0 protocol ip prio 3 handle 3 fw classid 1:13
+$TC filter add dev $IFACE parent 1:0 protocol ip prio 14 u32 match mark 4 0xffffffff police rate ${BL_RATE}kbit burst 6k drop flowid 1:14

 # ipv6 support. Note that the handle indicates the fw mark bucket that is looked for