Re: [LARTC] tc is giving an error: RTNETLINK answers: File exists

[gypsy <gypsy@iswest.com>]

fourcentsshy wrote:
> 
> Hello,
> 
> I'm using tc to limit the bandwidth of our wireless customers. I have a
> working script, but I'm not happy with it. I'm trying to write a more
> sophisticated script, but when I run it, it give me this error:
> 
> RTNETLINK answers: File exists
> 
> I have no idea what this error means or how to fix it.

It means pretty much what it says.  There is already a record matching
closely enough that it is duplicated.

> Here is a portion
> of the script (the whole script shapes several interfaces):
> 
> IDEV='eth5'
> TC='/sbin/tc'
> IPS='/etc/sysconfig/shaper/shape.ips'
> # high priority destination ports - I'll fill these in later (when this
> # thing works)
> HIGHPORT> # low priority destination ports
> LOWPORT> 
> $TC qdisc add dev $IDEV root handle 1: cbq bandwidth 1600Kbit cell 8\
> avpkt 1000 mpu 64
> $TC class add dev $IDEV parent 1: classid 1:1 est 1sec 8sec cbq\
>  bandwidth 1600Kbit rate 1500kbit allot 1514 maxburst 20 avpkt 1000\
>  prio 0 bounded isolated
> 
> cat $IPS | sed -e 's/#.*$//; s/^ *$//;' | while read IP RATE STATUS; do
>     if [ "x$IP" = "x" ]; then
>         continue
>     fi
> 
> # I use the last byte of the customer's IP's for the handle, which range
> # from 76 to 135 ATM.
> 
>     HANDLE="${IP##*.}"
> 
> # I get the error from the next line. Because it fails to create the
> # qdisc all the rest fail too.
> 
>     $TC qdisc add dev $IDEV parent 1:1 handle 1:$HANDLE cbq\
>  bandwidth 1600Kbit cell 8 avpkt 1000 mpu 64
> 
>     $TC class add dev $IDEV parent 1:$HANDLE classid $HANDLE:\
>  est 1sec 8sec cbq bandwidth 1600Kbit rate ${RATE}kbit allot 1514\
>  maxburst 20 avpkt 1000 prio 1 bounded isolated
>     $TC class add dev $IDEV parent $HANDLE: classid $HANDLE:1\
>  est 1sec 8sec cbq bandwidth 1600Kbit rate ${RATE}kbit allot 1514\
>  maxburst 20 avpkt 1000 prio 2
>     $TC class add dev $IDEV parent $HANDLE: classid $HANDLE:2 est 1sec\
>  8sec cbq bandwidth 1600Kbit rate $[9*$RATE/10]kbit allot 1514\
>  maxburst 20 avpkt 1000 prio 3
>     $TC class add dev $IDEV parent $HANDLE: classid $HANDLE:3 est 1sec\
>  8sec cbq bandwidth 1600Kbit rate $[8*$RATE/10]kbit allot 1514\
>  maxburst 20 avpkt 1000 prio 4
>     $TC qdisc add dev $IDEV parent $HANDLE:1 sfq quantum 1514b\
>  perturb 15
>     $TC qdisc add dev $IDEV parent $HANDLE:2 sfq quantum 1514b\
>  perturb 15
>     $TC qdisc add dev $IDEV parent $HANDLE:3 sfq quantum 1514b\
>  perturb 15
>     $TC filter add dev $IDEV parent 1: protocol ip prio 16\
>  u32 match ip src $IP flowid $HANDLE:
>     $TC filter add dev $IDEV parent $HANDLE: protocol ip prio 10\
>  u32 match ip tos 0x10 0xff flowid $HANDLE:1
>     $TC filter add dev $IDEV parent $HANDLE: protocol ip prio 11\
>  u32 match ip protocol 1 0xff flowid $HANDLE:1
>     $TC filter add dev $IDEV parent $HANDLE: protocol ip prio 12\
>  u32 match ip protocol 6 0xff match u8 0x05 0x0f at 0 match u16\
>  0x0000 0xffc0 at 2 flowid $HANDLE:1
> 
>     for a in $HIGHPORT; do
>         $TC filter add dev $IDEV parent 1:0 protocol ip prio 14\
>  u32 match ip dport $a 0xffff flowid $HANDLE:1
>     done
>     for a in $LOWPORT; do
>         $TC filter add dev $IDEV parent 1:0 protocol ip prio 16\
>  u32 match ip dport $a 0xffff flowid $HANDLE:3
>     done
>     $TC filter add dev $IDEV parent 1:0 protocol ip prio 15\
>  u32 match ip dst 0.0.0.0/0 flowid $HANDLE:2
> done
> 
> There are bound to other problems with this script, but until I can get
> past the current one, I'm dead in the water. TIA

You do not say which line or lines is causing the error so this is a
guess.

Run `tc -s filter show dev $IDEV' sending the output to a file because
there will be a lot of it.  I think you will find a ton of "duplicate"
filters.

Set prio to the same value (16 or 10 perhaps) for each and every line in
your `$TC filter' lines.
--
gypsy
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