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#!/bin/bash
#
#    cbq.init v0.7.3
#    Copyright (C) 1999  Pavel Golubev 
#    Copyright (C) 2001-2004  Lubomir Bulej 
#
#    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
#
#    To get the latest version, check on Freshmeat for actual location:
#
#		http://freshmeat.net/projects/cbq.init
#
#
# VERSION HISTORY
# ---------------
# v0.7.3- Deepak Singhal 
#	  - fix timecheck to not ignore regular TIME rules after
#	    encountering a TIME rule that spans over midnight
#	- Nathan Shafer 
#	  - allow symlinks to class files
#	- Seth J. Blank 
#	  - replace hardcoded ip/tc location with variables
#	- Mark Davis 
#	  - allow setting of PRIO_{MARK,RULE,REALM} in class file
#	- Fernando Sanch 
#	  - allow underscores in interface names
# v0.7.2- Paulo Sedrez
#	  - fix time2abs to allow hours with leading zero in TIME rules
#	- Svetlin Simeonov 
#	  - fix cbq_device_list to allow VLAN interfaces
#	- Mark Davis 
#	  - ignore *~ backup files when looking for classes
#	- Mike Boyer 
#	  - fix to allow arguments to be passed to "restart" command
# v0.7.1- Lubomir Bulej 
#	  - default value for PERTURB
#	  - fixed small bug in RULE parser to correctly parse rules with
#	    identical source and destination fields
#	  - faster initial scanning of DEVICE fields
# v0.7	- Lubomir Bulej 
#	  - lots of various cleanups and reorganizations; the parsing is now
#	    some 40% faster, but the class ID must be in range 0x0002-0xffff
#	    (again). Because of the number of internal changes and the above
#	    class ID restriction, I bumped the version to 0.7 to indicate
#	    something might have got broken :)
#	  - changed PRIO_{U32,FW,ROUTE} to PRIO_{RULE,MARK,REALM}
#	    for consistency with filter keywords
#	  - exposed "compile" command
#	- Catalin Petrescu 
#	  - support for port masks in RULE (u32) filter
#	- Jordan Vrtanoski 
#	  - support for week days in TIME rules
# v0.6.4- Lubomir Bulej 
#	  - 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 
#	  - 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 equal to 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 
#	  - added tunnels interface handling
# v0.6.1- Pavel Golubev 
#	  - added sch_prio module loading
#	    (thanks johan at iglo.virtual.or.id for reminding)
#	  - resolved errors resulting from stricter syntax checking in bash2
#	- Lubomir Bulej 
#	  - various cosmetic fixes
# v0.6	- Lubomir Bulej 
#	  - 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 
#	  - in case of overlapping TIME parameters, the last match is taken
#	- Juanjo Ciarlante 
#	  - chkconfig tags, list + stats startup parameters
#	  - optional tc & ip command logging (into /var/run/cbq-*)
#	- Rafal Maszkowski 
#	  - PEAK parameter for setting TBF's burst peak rate
#	  - fix for many config files (use find instead of ls)
# v0.5.1- Lubomir Bulej 
#	  - fixed little but serious bug in RULE parser
# v0.5	- Lubomir Bulej 
#	  - 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 
#	  - 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 
# v0.3a3- fixed grep bug when using more than 10 eth devices. Thanks to David
#	  Trcka .
# v0.3a2- fixed bug in "if" operator. Thanks kad at dgtu.donetsk.ua.
# 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 .
# 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 spartan, intolerant and requires quite a lot of
# typing. And typing is what this script attempts to reduce :)
#
# The advanced networking stuff in Linux is pretty flexible and this script
# aims to bring some of its features to the not-so-hard-core Linux users. Of
# course, there is a tradeoff between simplicity and flexibility and you may
# realize 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/cache/cbq.init by default) which
# is used next time the "start" command is run to avoid repeated parsing of
# 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. CBQ_DEBUG is not empty).
#
# If you only want cqb.init to translate your configuration to "tc" commands,
# use "compile" command which will output "tc" commands required to build
# your configuration. Bear in mind that "compile" does not check if the "tc"
# commands were successful - this is done (in certain places) only when the
# "start nocache" command is used, which is also useful when creating the
# configuration to check whether it is completely valid.
#
# 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-. where
#  is two-byte hexadecimal number in range <0002-FFFF> (which in fact
# is a CBQ class ID) and  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  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=,[,]	mandatory
# DEVICE=eth0,10Mbit,1Mbit
#
#	 is the name of the interface you want to control
#		traffic on, e.g. eth0
#	 is the physical bandwidth of the device, e.g. for
#		ethernet 10Mbit or 100Mbit, for arcnet 2Mbit
#	 is tuning parameter that should be proportional to
#		. As a rule of thumb:  =  / 10
#
# When you have more classes on one interface, it is enough to specify
#  [and ] only once, therefore in other files you only
# need to set DEVICE=.
#
### Class parameters
#
# RATE=					mandatory
# RATE=5Mbit
#
#	Bandwidth allocated to the class. Traffic going through the class is
#	shaped to conform to specified rate. You can use Kbit, Mbit or bps,
#	Kbps and Mbps as suffices. If you don't specify any unit, bits/sec
#	are used. Also note that "bps" means "bytes per second", not bits.
#
# WEIGHT= 				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=				optional, default not set
# PARENT=1280
#
#	Specifies ID of the parent class to which you want this class be
#	attached. 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
bool(false)