Interesting oopses...

Justin Schoeman
Mon, 29 Nov 2004 08:57:40 -0000

OK - this is starting to get frustrating... Are there any known issues
with 2.6.9 and traffic shaping?  I am using 2.6.9 with geoip 20041115,
and get odd oopses.  The following script oopses my box:

-----------------------------------------------------

#!/bin/sh -x

IFOUT=''eth1''
IFIN=''eth0''

TC=''/sbin/tc''
IPT=''/usr/local/sbin/iptables''

# BW definitions:
# units of kbit/s

NETBW=10000
OUTBW=116
INBW=116

# Clear old shapers...
echo "Clearing old shapers..."
$TC qdisc del dev $IFIN root 2> /dev/null > /dev/null
$TC qdisc del dev $IFOUT root 2> /dev/null > /dev/null

# Clear old iptables...
echo "Clearing old iptables..."
$IPT -t mangle -F POSTROUTING
$IPT -t mangle -F NATI
$IPT -t mangle -X NATI
$IPT -t mangle -N NATI
$IPT -t mangle -F INAT
$IPT -t mangle -X INAT
$IPT -t mangle -N INAT

# Match local traffic
$IPT -t mangle -A POSTROUTING -s 10.0.0.0/8 -d 10.0.0.0/8 -j CLASSIFY
--set-class 1:1
$IPT -t mangle -A POSTROUTING -s 10.0.0.0/8 -d 10.0.0.0/8 -j ACCEPT
# Classify local / international traffic
$IPT -t mangle -A POSTROUTING -s 10.0.0.0/8 -m geoip --dst-cc ZA -j NATI
$IPT -t mangle -A POSTROUTING -s 196.23.147.49/32 -m geoip --dst-cc ZA
-j NATI
$IPT -t mangle -A POSTROUTING -d 10.0.0.0/8 -m geoip --src-cc ZA -j NATI
$IPT -t mangle -A POSTROUTING -d 196.23.147.49/32 -m geoip --src-cc ZA
-j NATI
$IPT -t mangle -A POSTROUTING -j INAT

# Rules for international traffic
$IPT -t mangle -A INAT -j CLASSIFY --set-class 20:100
$IPT -t mangle -A INAT -j ACCEPT
# Rules for local traffic
$IPT -t mangle -A NATI -j CLASSIFY --set-class 20:200
$IPT -t mangle -A NATI -j ACCEPT

# Build output rules
$TC qdisc add dev $IFOUT root handle 1: prio bands 2 priomap 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
$TC qdisc add dev $IFOUT parent 1:1 handle 10: pfifo limit 10
$TC qdisc add dev $IFOUT parent 1:2 handle 20: htb default 100 r2q 1
$TC class add dev $IFOUT parent 20: classid 20:10 htb rate ${OUTBW}kbit
ceil ${OUTBW}kbit prio 0
$TC class add dev $IFOUT parent 20:10 classid 20:100 htb rate 60kbit
ceil 60kbit prio 0
$TC class add dev $IFOUT parent 20:10 classid 20:200 htb rate 56kbit
ceil ${OUTBW}kbit prio 1
$TC qdisc add dev $IFOUT parent 20:100 handle 100: pfifo limit 10
$TC qdisc add dev $IFOUT parent 20:200 handle 200: pfifo limit 10

# Build input rules
$TC qdisc add dev $IFIN root handle 1: prio bands 2 priomap 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
$TC qdisc add dev $IFIN parent 1:1 handle 10: pfifo limit 10
$TC qdisc add dev $IFIN parent 1:2 handle 20: htb default 100 r2q 1
$TC class add dev $IFIN parent 20: classid 20:10 htb rate ${INBW}kbit
ceil ${INBW}kbit prio 0
$TC class add dev $IFIN parent 20:10 classid 20:100 htb rate 60kbit ceil
60kbit prio 0
$TC class add dev $IFIN parent 20:10 classid 20:200 htb rate 56kbit ceil
${INBW}kbit prio 1
$TC qdisc add dev $IFIN parent 20:100 handle 100: pfifo limit 10
$TC qdisc add dev $IFIN parent 20:200 handle 200: pfifo limit 10

---------------------------------

The script as-is oopses my box every time. If I changed the initial
classification for local traffic from 1:1 to 10: (an initial
misunderstanding ;-) ), then it does not oops.

If, instead of a prio qdisc, I use a single HTB class for distributing
local and external traffic, then it also works, but after a while, one
of the classes will simply stop sending traffic...

Does anybody have any idea what is going on here?

Thanks,
-justin