# Copyright (C) 1999 Pavel Golubev <pg@ksi-linux.com>

#!/bin/bash
#
# cbq.init v0.6.4
# Copyright (C) 1999 Pavel Golubev <[email protected]>
#
# chkconfig: 2345 11 89
# description: sets up CBQ-based traffic control
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# You can always get the latest version from
#
# ftp://ftp.equinox.gu.net/pub/linux/cbq/cbq.init
#
#
# VERSION HISTORY
# ---------------
# v0.6.4- Lubomir Bulej <[email protected]>
# - added PRIO_* variables to allow easy control of filter priorities
# - added caching to speed up CBQ start, the cache is invalidated
# whenever any of the configuration files changes
# - updated the readme section + some cosmetic fixes
# v0.6.3- Lubomir Bulej <[email protected]>
# - removed setup of (unnecessary) class 1:1 - all classes
# now use qdisc's default class 1:0 as their parent
# - minor fix in the timecheck branch - classes
# without leaf qdisc were not updated
# - minor fix to avoid timecheck failure when run
# at time with minutes 08 or 09
# - respect CBQ_PATH setting in environment
# - made PRIO=5 default, rendering it optional in configs
# - added support for route filter, see notes about REALM keyword
# - added support for fw filter, see notes about MARK keyword
# - added filter display to "list" and "stats" commands
# - readme section update + various cosmetic fixes
# v0.6.2- Catalin Petrescu <[email protected]>
# - added tunnels interface handling
# v0.6.1- Pavel Golubev <[email protected]>
# - added sch_prio module loading
# (thanks [email protected] for reminding)
# - resolved errors resulting from stricter syntax checking in bash2
# - Lubomir Bulej <[email protected]>
# - various cosmetic fixes
# v0.6 - Lubomir Bulej <[email protected]>
# - attempt to limit number of spawned processes by utilizing
# more of sed power (use sed instead of grep+cut)
# - simplified TIME parser, using bash builtins
# - added initial support for SFQ as leaf qdisc
# - reworked the documentation part a little
# - incorporated pending patches and ideas submitted by
# following people for versions 0.3 into version 0.6
# - Miguel Freitas <[email protected]>
# - in case of overlapping TIME parameters, the last match is taken
# - Juanjo Ciarlante <[email protected]>
# - chkconfig tags, list + stats startup parameters
# - optional tc & ip command logging (into /var/run/cbq-*)
# - Rafal Maszkowski <[email protected]>
# - PEAK parameter for setting TBF's burst peak rate
# - fix for many config files (use find instead of ls)
# v0.5.1- Lubomir Bulej <[email protected]>
# - fixed little but serious bug in RULE parser
# v0.5 - Lubomir Bulej <[email protected]>
# - added options PARENT, LEAF, ISOLATED and BOUNDED. This allows
# (with some attention to config file ordering) for creating
# hierarchical structures of shapers with classes able (or unable)
# to borrow bandwidth from their parents.
# - class ID check allows hexadecimal numbers
# - rewritten & simplified RULE parser
# - cosmetic changes to improve readability
# - reorganization to avoid duplicate code (timecheck etc.)
# - timecheck doesn't check classes without TIME fields anymore
# v0.4 - Lubomir Bulej <[email protected]>
# - small bugfix in RULE parsing code
# - simplified configuration parsing code
# - several small cosmetic changes
# - TIME parameter can be now specified more than once allowing you to
# differentiate RATE throughout the whole day. Time overlapping is
# not checked, first match is taken. Midnight wrap (eg. 20:00-6:00)
# is allowed and taken care of.
# v0.3a4- fixed small bug in IF operator. Thanks to
# Rafal Maszkowski <[email protected]>
# v0.3a3- fixed grep bug when using more than 10 eth devices. Thanks to David
# Trcka <[email protected]>.
# v0.3a2- fixed bug in "if" operator. Thanks [email protected].
# v0.3a - added TIME parameter. Example: TIME=00:00-19:00;64Kbit/6Kbit
# So, between 00:00 and 19:00 the RATE will be 64Kbit.
# Just start "cbq.init timecheck" periodically from cron
# (every 10 minutes for example). DON'T FORGET though, to run
# "cbq.init start" for CBQ to initialize.
# v0.2 - Some cosmetic changes. Now it is more compatible with old bash
# version. Thanks to Stanislav V. Voronyi <[email protected]>.
# v0.1 - First public release
#
#
# README
# ------
#
# First of all - this is just a SIMPLE EXAMPLE of CBQ power.
# Don't ask me "why" and "how" :)
#
# This script is meant to simplify setup and management of relatively simple
# CBQ-based traffic control on Linux. Access to advanced networking features
# of Linux kernel is provided by "ip" and "tc" utilities from A. Kuznetsov's
# iproute2 package, available at ftp://ftp.inr.ac.ru/ip-routing. Because the
# utilities serve primarily to translate user wishes to RTNETLINK commands,
# their interface is rather austere, intolerant and requires quite a lot of
# typing. And typing is what this script (hopefully) reduces.
#
# The advanced networking stuff in Linux is _very_ flexible and this script
# aims to bring some of its features to the not-so-hard-core Linux users. Of
# course, there is tradeoff between simplicity and flexibility and you might
# find out that the flexibility suffered too much for your needs -- time to
# face "ip" and "tc" interface :)
#
# To speed up the "start" command, simple caching was introduced in version
# 0.6.4. The caching works so that the sequence of "tc" commands for given
# configuration is stored in a file (/var/run/cbq-cache by default) which
# is used next time "start" command is run to avoid repeated parsing of the
# configuration files. This cache is invalidated whenever any of the CBQ
# configuration files changes. If you want to run "cbq.init start" without
# caching, run it as "cbq.init start nocache". If you want to force cache
# invalidation, run it as "cbq.init start invalidate". Caching is disabled
# if you have logging enabled (ie. LOG_FILE is not empty).
#
# All CBQ parameters are valid for Ethernet interfaces only, The script was
# tested on various Linux kernel versions from series 2.1 to 2.4 and several
# distributions with KSI Linux (Nostromo version) as the premier one.
#
#
# HOW DOES IT WORK?
# -----------------
#
# Every traffic class must be described by a file in the $CBQ_PATH directory
# (/etc/sysconfig/cbq by default) - one file per class.
#
# The config file names must obey mandatory format: cbq-<clsid>.<name> where
# <clsid> is two-byte hexadecimal number in range <0001-FFFF> (which in fact
# is a CBQ class ID) and <name> is the name of the class -- anything to help
# you distinguish the configuration files. For small amount of classes it is
# often possible (and convenient) to let <clsid> resemble bandwidth of the
# class.
#
# Example of valid config name:
# cbq-1280.My_first_shaper
#
#
# The configuration file may contain the following parameters:
#
### Device parameters
#
# DEVICE=<ifname>,<bandwidth>,<weight> mandatory
# DEVICE=eth0,10Mbit,1Mbit
#
# <ifname> is the name of the interface you want to control
# traffic on, e.g. eth0
# <bandwidth> is the physical bandwidth of the device, e.g. for
# ethernet 10Mbit or 100Mbit, for arcnet 2Mbit
# <weight> is tuning parameter that should be proportional to
# <bandwidth>. As a rule of thumb: <weight> = <bandwidth> / 10
#
# When you have more classes on one interfaces, it is enough to specify
# <bandwidth> and <weight> only once, therefore in other files you can
# have just DEVICE=<ifname>.
#
### Class parameters
#
# RATE=<speed> mandatory
# RATE=5Mbit
#
# Bandwidth allocated to class. Traffic going through the class is
# shaped to conform to the given rate. You can use Kbit, Mbit or
# bps, Kbps and Mbps as suffices.miting speed of the shaper.
# You can use Kbit, Mbit or bps, Kbps, Mbps as suffixes.
#
# WEIGHT=<speed> mandatory
# WEIGHT=500Kbit
#
# Tuning parameter that should be proportional to RATE. As a rule
# of thumb, use WEIGHT ~= RATE / 10.
#
# PRIO=<1-8> optional, default 5
# PRIO=5
#
# Priority of class traffic. The higher the number, the lesser
# the priority. Priority of 5 is just fine.
#
# PARENT=<clsid> optional, default not set
# PARENT=1280
#
# Specifies ID of the parent class you want to attach the CBQ
# class to. You might want to use LEAF=none for the parent class as
# mentioned below. By using this parameter and carefully ordering the
# configuration files, it is possible to create simple hierarchical
# structures of CBQ classes. The ordering is important so that parent
# classes are constructed prior to their children.
#
# LEAF=none|tbf|sfq optional, default "tbf"
#
# Tells the script to attach specified leaf queueing discipline to CBQ
# class. By default, TBF is used. Note that attaching TBF to CBQ class
# shapes the traffic to conform to TBF parameters and prevents the class
# from borrowing bandwidth from its parent even if you have set BOUNDED
# to "no". To allow the class to borrow bandwith (provided it is not
# bounded), you must set LEAF to "none" or "sfq".
#
# If you want to ensure (approximately) fair sharing of bandwidth among
# several hosts in the same class, you might want to specify LEAF=sfq to
# attach SFQ as leaf queueing discipline to that class. Support for more
# queueing disciplines will be probably added in future.
#
# BOUNDED=yes|no optional, default "yes"
#
# If set to "yes", the class is not allowed to borrow bandwidth from
# its parent class in overlimit situation. If set to "no", the class
# will be allowed to borrow bandwidth.
#
# Note: Don't forget to set LEAF to "none" or "sfq", otherwise the class will
# not be able to borrow bandwith,
#
# ISOLATED=yes|no optional, default "no"
#
# If set to "yes", the class will not lend unused bandwidth to
# its children.
#
### TBF qdisc parameters
#
# BUFFER=<bytes>[/<bytes>] optional, default "10Kb/8"
#
# This parameter controls the depth of the token bucket. In other
# words it represents the maximal burst size the class can send.
# The optional part of parameter is used to determine the length
# of intervals in packet sizes, for which the transmission times
# are kept.
#
# LIMIT=<bytes> optional, default "15Kb"
#
# This parameter determines the maximal length of backlog. If
# the queue contains more data than specified by LIMIT, the
# newly arriving packets are dropped. The length of backlog
# determines queue latency in case of congestion.
#
# PEAK=<speed> optional, default not set
#
# Maximal peak rate for short-term burst traffic. This allows you
# to control the absolute peak rate the class can send at, because
# single TBF that allows 256Kbit/s would of course allow rate of
# 512Kbit for half a second or 1Mbit for a quarter of second.
#
# MTU=<bytes> optional, default "1500"
#
# Maximum number of bytes that can be sent at once over the
# physical medium. This parameter is required when you specify
# PEAK parameter. It defaults to MTU of ethernet - for other
# media types you might want to change it.
#
# Note: Setting TBF as leaf qdisc will effectively prevent the class from
# borrowing bandwidth from the ancestor class, because even if the
# class allows more traffic to pass through, it is then shaped to
# conform to TBF.
#
### SFQ qdisc parameters
#
# The SFQ queueing discipline is a cheap way for sharing class bandwidth
# among several hosts. As it is stochastic, the fairness is approximate but
# it will do the job in most cases. If you want real fairness, you should
# probably use WRR (weighted round robin) or WFQ queueing disciplines. Note
# that SFQ does not do any traffic shaping - the shaping is done by the CBQ
# class the SFQ is attached to.
#
# QUANTUM=<bytes> optional, default not set
#
# This parameter should not be set lower than link MTU, for ethernet
# it is 1500b, or (with MAC header) 1514b which is the value used
# in Alexey Kuznetsov's examples.
#
# PERTURB=<seconds> optional, default not set
#
# Period of hash function perturbation. In Alexey Kuznetsov's
# examples the value used was 15 seconds.
#
### Filter parameters
#
# RULE=[[saddr[/prefix]][:port],][daddr[/prefix]][:port]
#
# These parameters make up "u32" filter rules that select traffic for
# each of the classes. You can use multiple RULE fields per config.
#
# Some examples:
#
# RULE=10.1.1.0/24:80
# selects traffic going to port 80 in network 10.1.1.0
#
# RULE=10.2.2.5
# selects traffic going to any port on single host 10.2.2.5
#
# RULE=:25,10.2.2.128/26:5000
# selects traffic going from anywhere on port 50 to
# port 5000 in network 10.2.2.128
#
# RULE=10.5.5.5:80,
# selects traffic going from port 80 of single host 10.5.5.5
#
#
#
# REALM=[srealm,][drealm]
#
# These parameters make up "route" filter rules that classify traffic
# according to packet source/destination realms. For information about
# realms, see Alexey Kuznetsov's IP Command Reference. This script
# does not define any realms, it justs builds "tc filter" commands
# for you if you need to classify traffic this way.
#
# Realm is either a decimal number or a string referencing entry in
# /etc/iproute2/rt_realms (usually).
#
# Some examples:
#
# REALM=russia,internet
# selects traffic going from realm "russia" to realm "internet"
#
# REALM=freenet,
# selects traffic going from realm "freenet"
#
# REALM=10
# selects traffic going to realm 10
#
#
# MARK=<mark>
#
# These parameters make up "fw" filter rules that select traffic for
# each of the classes accoring to firewall "mark". Mark is a decimal
# number packets are tagged with if firewall rules say so. You can
# use multiple MARK fields per config.
#
#
# Note: Rules for different filter types can be combined. Attention must be
# paid to the priority of filter rules, which can be set below using
# PRIO_{U32,FW,ROUTE} variables.
#
### Time ranging parameters
#
# TIME=<from>-<till>;<rate>/<weight>[/<peak>] optional
# TIME=18:00-06:00;256Kbit/25Kbit
#
# This parameter allows you to differentiate the class bandwidth
# throughout the day. You can specify multiple TIME parameters, if
# the times overlap, last match is taken. The fields <rate>, <weight>
# and <peak> correspond to parameters RATE, WEIGHT and PEAK (which
# is optional and applies to TBF qdisc only).
#
###
#
# Sample configuration file: cbq-1280.My_first_shaper
#
# --------------------------------------------------------------------------
# DEVICE=eth0,10Mbit,1Mbit
# RATE=128Kbit
# WEIGHT=10Kbit
# PRIO=5
# RULE=192.128.1.0/24
# --------------------------------------------------------------------------
#
# The configuration says that we will control traffic on 10Mbit ethernet
# device eth0 and the traffic going to network 192.168.1.0 will be processed
# with priority 5 and shaped to rate of 128Kbit.
#
# Note that you can control outgoing traffic only. If you want to control
# traffic in both directions, you must set up CBQ for both interfaces.
#
# Consider the following example:
#
# +---------+ 192.168.1.1
# BACKBONE -----eth0-| linux |-eth1------*-[client]
# +---------+
#
# Imagine you want to shape traffic from backbone to the client to 28Kbit
# and traffic in the opposite direction to 128Kbit. You need to setup CBQ
# on both eth0 and eth1 interfaces, thus you need two config files:
#
# cbq-28.backbone-client
# --------------------------------------------------------------------------
# DEVICE=eth1,10Mbit,1Mbit
# RATE=28Kbit
# WEIGHT=2Kbit
# PRIO=5
# RULE=192.168.1.1
# --------------------------------------------------------------------------
#
# cbq-128.client-backbone
# --------------------------------------------------------------------------
# DEVICE=eth0,10Mbit,1Mbit
# RATE=128Kbit
# WEIGHT=10Kbit
# PRIO=5
# RULE=192.168.1.1,
# --------------------------------------------------------------------------
#
# Pay attention to comma "," in the RULE field - it denotes source address!
#
# Enjoy.
#
#############################################################################

PATH="/sbin:/usr/sbin:/bin:/usr/bin"

### Filter priorities (must be different)
PRIO_U32=100
PRIO_FW=200
PRIO_ROUTE=300

### Respect external CBQ_PATH & CBQ_CACHE settings
[ -z "$CBQ_PATH" ] && CBQ_PATH="/etc/sysconfig/cbq"
[ -z "$CBQ_CACHE" ] && CBQ_CACHE="/var/run/cbq-cache"

### Uncomment for debugging
#LOG_FILE="/var/run/cbq-$1"

if [ "$2" = "compile" ]; then
### echo-only equivalent of "tc" command
tc () {
echo -e "tc $@\n"
} # tc
elif [ -n "$LOG_FILE" ]; then
echo "# `date`" > $LOG_FILE

### Logging equivalent of "ip" command
ip () {
echo -e "\nip $@\n" >> $LOG_FILE
/sbin/ip "$@" 2>&1 | tee -a $LOG_FILE
} # ip

### Logging equivalent of "tc" command
tc () {
echo -e "\ntc $@\n" >> $LOG_FILE
/sbin/tc "$@" 2>&1 | tee -a $LOG_FILE
} # tc
fi # command logging

### Remove CBQ from all devices
cbq_off () {
for dev in `ip link| sed -n '/^[0-9]/ { s/^[0-9]\+: $[a-z0-9]\+$[:@].*/\1/; p; }'`; do
cbq_device_off $dev
done
} # cbq_off

### Remove root class from device $1
cbq_device_off () {
tc qdisc del dev $1 root 2> /dev/null
} # cbq_device_off

### Display CBQ setup
cbq_show () {
for dev in $DEVICES; do
echo ---[ $dev: queueing disciplines ]-------------------------
echo; tc $1 qdisc show dev $dev; echo

echo ---[ $dev: configured classes ]---------------------------
echo; tc $1 class show dev $dev; echo

[ "$1" = "-s" ] && continue
echo ---[ $dev: filtering rules ]------------------------------
echo; tc $1 filter show dev $dev; echo
done
} # cbq_show

### Check configuration and load DEVFIELDS/CLASSLIST
cbq_init () {

### Check configuration in $CBQ_PATH directory and get CLASSLIST
CLASSLIST=`find $CBQ_PATH -name 'cbq-*' -maxdepth 1 -printf "%f\n"| sort`
if [ -z "$CLASSLIST" ]; then
echo "**CBQ: not configured in $CBQ_PATH!"
exit
fi

### Collect all DEVICE fields from $CBQ_PATH/cbq-*
DEVFIELDS=`find $CBQ_PATH -name 'cbq-*' -maxdepth 1 -exec sed -ne\
's/#.*//; s/ //g; /^DEVICE=.*,.*,.*/ { s/.*=//; p; q; }; \
/^DEVICE=/ q' {} \;| sort -u`

### Check if there are any devices to set up
if [ -z "$DEVFIELDS" ]; then
echo "**CBQ: can't find any DEVICE field in $CBQ_PATH/cbq-*!"
exit
fi

### Extract all device names from DEVICE fields in $CBQ_PATH/cbq-*
DEVICES=`echo "$DEVFIELDS"| sed 's/,.*//'| sort -u`

### Check for multiple devices with different DEVICE fields
if [ `echo "$DEVICES"| wc -l` -ne `echo "$DEVFIELDS"| wc -l` ]; then
echo "**CBQ: multiple (different) DEVICE fields for the same device found!"
echo "$DEVFIELDS"
exit
fi
} # cbq_init

### Load class configuration from file $1
cbq_load_class () {
CNAME="$CBQ_PATH/$1"
CFILE=`sed -e 's/#.*//; s/ //g; /^$/ d' $CNAME`

CLASS=`echo $1| sed 's/^cbq-0*//; s/\..*//'`
IDVAL=`/usr/bin/printf "%d" 0x$CLASS 2> /dev/null`
if [ $? -ne 0 -o $IDVAL -eq 0 -o $IDVAL -gt 65535 ]; then
echo "**CBQ: class ID of $1 must be in range <0001-FFFF>!"
cbq_off
exit
fi

### Device parameters
DEVICE=`echo "$CFILE"| sed -n '/^DEVICE=/ { s/.*=//; s/,.*//; p; q; }'`
BANDWIDTH=`echo "$DEVFIELDS"| sed -n "/^$DEVICE,/ { s/.*,$.*$,.*/\1/; p; q; }"`

### Class parameters
CLASSID="1:$CLASS"
PARENT=`echo "$CFILE"| sed -n '/^PARENT=/ { s/.*=0*//; p; q; }'`
[ -z "$PARENT" ] && PARENT="1:0" || PARENT="1:$PARENT"

LEAF=`echo "$CFILE"| sed -n '/^LEAF=/ { s/.*=//; p; q; }'`
[ -z "$LEAF" ] && LEAF="tbf"

BOUNDED=`echo "$CFILE"| sed -n '/^BOUNDED=/ { s/.*=//; p; q; }'`
[ "$BOUNDED" = "no" ] && BOUNDED="" || BOUNDED="bounded"

ISOLATED=`echo "$CFILE"| sed -n '/^ISOLATED=/ { s/.*=//; p; q; }'`
[ "$ISOLATED" = "yes" ] && ISOLATED="isolated" || ISOLATED=""

PRIO=`echo "$CFILE"| sed -n '/^PRIO=/ { s/.*=//; p; q; }'`
[ -z "$PRIO" ] && PRIO="5"

RATE=`echo "$CFILE"| sed -n '/^RATE=/ { s/.*=//; p; q; }'`
WEIGHT=`echo "$CFILE"| sed -n '/^WEIGHT=/ { s/.*=//; p; q; }'`
if [ -z "$RATE" -o -z "$WEIGHT" ]; then
echo "**CBQ: missing RATE or WEIGHT field(s) in $1!"
cbq_off
exit
fi

### Leaf qdisc parameters for TBF
if [ "$LEAF" = "tbf" ]; then
BUFFER=`echo "$CFILE"| sed -n '/^BUFFER=/ { s/.*=//; p; q; }'`
[ -z "$BUFFER" ] && BUFFER="10Kb/8"

LIMIT=`echo "$CFILE"| sed -n '/^LIMIT=/ { s/.*=//; p; q; }'`
[ -z "$LIMIT" ] && LIMIT="15Kb"

PEAK=`echo "$CFILE"| sed -n '/^PEAK=/ { s/.*=//; p; q; }'`
[ -n "$PEAK" ] && PEAK="peakrate $PEAK"

MTU=`echo "$CFILE"| sed -n '/^MTU=/ { s/.*=//; p; q; }'`
[ -z "$MTU" ] && MTU="1500"

### Leaf qdisc parameters for SFQ
elif [ "$LEAF" = "sfq" ]; then
PERTURB=`echo "$CFILE"| sed -n '/^PERTURB=/ { s/.*=//; p; q; }'`
[ -n "$PERTURB" ] && PERTURB="perturb $PERTURB"

QUANTUM=`echo "$CFILE"| sed -n '/^QUANTUM=/ { s/.*=//; p; q; }'`
[ -n "$QUANTUM" ] && QUANTUM="quantum $QUANTUM"
fi
} # cbq_load_class

### Convert time to absolute value
cbq_time2abs () {
_min=${1##*:}
_min=${_min##0}
echo $[${1%%:*}*60 + _min]
} # cbq_time2abs

### Check if ip-route is installed
if [ ! -f /sbin/tc -o ! -f /sbin/ip ]; then
echo "**CBQ: ip-route2 utilities not installed!"
exit
fi

########################################################################
# See how were we called #
########################################################################

case "$1" in

### START ###
start)

### If you have cbq, tbf, sfq and u32 compiled into kernel,
### make the following test condition fail...
if /bin/true; then
for module in sch_{cbq,tbf,sfq,prio} cls_{fw,u32,route}; do
if ! modprobe $module; then
echo "**CBQ: could not load module $module"
exit
fi
done
fi

### if we are in compile/nocache/logging mode, don't bother with cache
if [ "$2" != "compile" -a "$2" != "nocache" -a -z "$LOG_FILE" ]; then
### if we don't have cache or the cache is old, (re)create it
if [ ! -f $CBQ_CACHE -o "$2" = "invalidate" ]; then
$0 start compile > $CBQ_CACHE
elif [ `find $CBQ_PATH -maxdepth 1 -newer $CBQ_CACHE| wc -l` -gt 0 ]; then
$0 start compile > $CBQ_CACHE
fi

### run the cached commands
exec /bin/sh $CBQ_CACHE 2> /dev/null
fi

########################################################################
# Get all devices from configuration files $CBQ_PATH/cbq-* #
# and setup CBQ root classes for them (if it is possible). #
########################################################################

### Load DEVICES, DEVFIELDS and CLASSLIST
cbq_init

### Try to discover interface bandwidth from DEVICE
### field and if OK - setup root class for this one

for dev in $DEVICES; do
### Retrieve device bandwidth and weight
DEVTEMP=`echo "$DEVFIELDS"| sed -n "/^$dev,/ { s/.*,$.*$,$.*$/\1,\2/; p; q; }"`
DEVBWDT=${DEVTEMP%%,*}
DEVWGHT=${DEVTEMP##*,}

### If correctly set and the device is up, setup root class
if [ -n "$DEVBWDT" -a -n "$DEVWGHT" ]; then
if ! ip link | grep -q "$dev[:@].*UP"; then
echo "**CBQ: could not find device $dev! CBQ turned off."
cbq_off
exit
fi

### Remove old root qdisc from device
cbq_device_off $dev

### Setup root class and queueing discipline for device
tc qdisc add dev $dev root handle 1: cbq \
bandwidth $DEVBWDT avpkt 1000 cell 8
else
echo "**CBQ: could not determine bandwidth or weight for device $dev!"
echo "**CBQ: set the DEVICE field properly!"
exit
fi
done # device

#######################################################################
# Set up all classes configured in $CBQ_PATH/cbq-* #
#######################################################################

for classfile in $CLASSLIST; do

cbq_load_class $classfile

### Create class and setup leaf qdisc
tc class add dev $DEVICE parent $PARENT classid $CLASSID cbq \
bandwidth $BANDWIDTH rate $RATE weight $WEIGHT prio $PRIO \
allot 1514 cell 8 maxburst 20 avpkt 1000 $BOUNDED $ISOLATED

### Setup leaf queueing discipline
if [ "$LEAF" = "tbf" ]; then
tc qdisc add dev $DEVICE parent $CLASSID tbf \
rate $RATE buffer $BUFFER limit $LIMIT mtu $MTU $PEAK
elif [ "$LEAF" = "sfq" ]; then
tc qdisc add dev $DEVICE parent $CLASSID sfq \
$PERTURB $QUANTUM
fi

### Create fw filter for MARK fields
MARKSET=`echo "$CFILE"| sed -n '/^MARK/ { s/.*=//; p; }'`
if [ -n "$MARKSET" ]; then
for mark in $MARKSET; do
### Attach fw filter to root class
tc filter add dev $DEVICE parent 1:0 protocol ip \
prio $PRIO_FW handle $mark fw classid $CLASSID
done ### mark
fi

### Create route filter for REALM fields
REALMSET=`echo "$CFILE"| sed -n '/^REALM/ { s/.*=//; p; }'`
if [ -n "$REALMSET" ]; then
for realm in $REALMSET; do
### Separate source/destination realms
DREALM=${realm##*,}; SREALM=""
[ "$DREALM" != "$realm" ] && SREALM=${realm%%,*}

[ "$DREALM" = "*" ] && DREALM=""
[ "$SREALM" = "*" ] && SREALM=""

[ -n "$SREALM" ] && SREALM="from $SREALM"
[ -n "$DREALM" ] && DREALM="to $DREALM"

### Attach route filter to the root class
tc filter add dev $DEVICE parent 1:0 protocol ip \
prio $PRIO_ROUTE route $SREALM $DREALM classid $CLASSID
done ### realm
fi

### Create u32 filter for addresses specified by RULE fields
RULESET=`echo "$CFILE"| sed -n '/^RULE/ { s/.*=//; p; }'`
[ -z "$RULESET" ] && continue

### Rules present, parse them
for rule in $RULESET; do
u32_s=""; u32_d=""
SADDR=""; SPORT=""

### Split up destination
DST=${rule##*,}
DADDR=${DST%%:*}

[ "$DADDR" != "$DST" ] && DPORT=${DST##*:} || DPORT=""
[ "$DADDR" = "*" ] && DADDR=""

### Split up source (if specified)
if [ "$DST" != "$rule" ]; then
SRC=${rule%%,*}
SADDR=${SRC%%:*}

[ "$SADDR" != "$SRC" ] && SPORT=${SRC##*:}
[ "$SADDR" = "*" ] && SADDR=""
fi

### Compose the u32 filter rules
[ -n "$SPORT" ] && u32_s="match ip sport $SPORT 0xffff"
[ -n "$SADDR" ] && u32_s="match ip src $SADDR $u32_s"
[ -n "$DPORT" ] && u32_d="match ip dport $DPORT 0xffff"
[ -n "$DADDR" ] && u32_d="match ip dst $DADDR $u32_d"

### Uncomment the following if you want to see parsed rules
#echo "$rule: $u32_s $u32_d"

### Attach u32 filter to the appropriate class
tc filter add dev $DEVICE parent 1:0 protocol ip \
prio $PRIO_U32 u32 $u32_s $u32_d flowid $CLASSID
done ### rule

done ### class file
;;

### TIMECHECK ###
timecheck)

### Load DEVICES, DEVFIELDS and CLASSLIST
cbq_init

### Current time in hh:mm format
TIME_NOW=`date +%k:%M`
TIME_ABS=`cbq_time2abs $TIME_NOW`

### Check every config file for TIME parameter
for classfile in $CLASSLIST; do

TIMERATES=`sed -ne 's/#.*//; s/ //g; /^TIME/ { s/.*=//; p; }' $CBQ_PATH/$classfile`
[ -z "$TIMERATES" ] && continue

MATCH=0; CHANGE=0;
for timerate in $TIMERATES; do

### Split up TIME parameter
INTERVAL=${timerate%%;*}; PARAMS=${timerate##*;}
BEG_TIME=${INTERVAL%%-*}; END_TIME=${INTERVAL##*-}

### Compute interval boundaries
BEG_ABS=`cbq_time2abs $BEG_TIME`
END_ABS=`cbq_time2abs $END_TIME`

### Midnight wrap fixup
if [ $BEG_ABS -gt $END_ABS ]; then
[ $TIME_ABS -le $END_ABS ] && TIME_ABS=$[TIME_ABS + 24*60]
END_ABS=$[END_ABS + 24*60]
fi

### If the time matches, remember params and set MATCH flag
if [ $TIME_ABS -ge $BEG_ABS -a $TIME_ABS -lt $END_ABS ]; then
TMP_RATE=${PARAMS%%/*}
TMP_WGHT=${PARAMS#*/}
TMP_PEAK=${TMP_WGHT#*/}

[ "$TMP_PEAK" = "$TMP_WGHT" ] && TMP_PEAK="" || TMP_WGHT={$TMP_WGHT%%/*}

[ -n "$TMP_PEAK" ] && TMP_PEAK="peakrate $TMP_PEAK"
MATCH=1
fi
done ### timerate

cbq_load_class $classfile

### Get current RATE of CBQ class
RATE_NOW=`tc class show dev $DEVICE| sed -n \
"/cbq $CLASSID / { s/.*rate //; s/ .*//; p; q; }"`
[ -z "$RATE_NOW" ] && continue

### Time interval match is found
if [ $MATCH -ne 0 ]; then

### Check if there is any change in class RATE
if [ "$RATE_NOW" != "$TMP_RATE" ]; then
NEW_RATE="$TMP_RATE"
NEW_WGHT="$TMP_WGHT"
NEW_PEAK="$TMP_PEAK"
CHANGE=1
fi

### Match not found, reset to default RATE if necessary
elif [ "$RATE_NOW" != "$RATE" ]; then
NEW_WGHT="$WEIGHT"
NEW_RATE="$RATE"
NEW_PEAK="$PEAK"
CHANGE=1
fi

### If there's a change, replace CBQ class and leaf qdisc
[ $CHANGE -ne 1 ] && continue

### Replace CBQ class
tc class replace dev $DEVICE classid $CLASSID cbq \
bandwidth $BANDWIDTH rate $NEW_RATE weight $NEW_WGHT prio $PRIO \
allot 1514 cell 8 maxburst 20 avpkt 1000 $BOUNDED $ISOLATED

echo "**CBQ: $TIME_NOW: class $CLASS on $DEVICE changed rate ($RATE_NOW -> $NEW_RATE)"

### Get leaf qdisc handle
LEAF_HND=`tc class show dev $DEVICE| sed -n \
"/cbq $CLASSID .* leaf / { s/.*leaf //; s/ .*//; p; q; }"`
[ -z "$LEAF_HND" ] && continue

### Replace leaf qdisc (if any)
if [ "$LEAF" = "tbf" ]; then
tc qdisc replace dev $DEVICE handle $LEAF_HND tbf \
rate $NEW_RATE buffer $BUFFER limit $LIMIT mtu $MTU $NEW_PEAK
fi
done ### class file

;;

### STOP ###
stop)
cbq_off
;;

### RESTART ###
restart)
$0 stop
$0 start
;;

### LIST ###
list)
cbq_init
cbq_show
;;

### STATS ###
stats)
cbq_init
cbq_show -s
;;

### default ###
*)
echo "Usage: " `basename $0` "{start [nocache|invalidate]|stop|restart|timecheck|list|stats}"
esac