[LARTC] TC basic match problems

[LARTC] TC basic match problems

[Peter Rabbitson]

Hello,

I am attempting to match on a single bit of the NF mark value, and after 
hours of reading and googling I can not get the syntax right. It got to 
be something very simple, yet I can't find it. Any help will be greatly 
appreciated.

Thanks!

root@Arzamas:/etc/init.d# tc filter add dev wan_b protocol ip prio 2 
parent 1:0 basic match meta\(nf_mark mask 0x80 eq 0x80\) flowid 1:0x80
RTNETLINK answers: No such file or directory
We have an error talking to the kernel
root@Arzamas:/etc/init.d#

root@Arzamas:/etc/init.d# tc qdisc show dev wan_b
qdisc htb 1: r2q 10 default 2 direct_packets_stat 0
root@Arzamas:/etc/init.d#

root@Arzamas:/etc/init.d# tc class show dev wan_b
class htb 1:10 parent 1:1 prio 2 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:1 root rate 8000Mbit ceil 8000Mbit burst 1000999b cburst 
1000999b
class htb 1:20 parent 1:1 prio 4 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:2 root prio 0 rate 8000Mbit ceil 8000Mbit burst 1000999b 
cburst 1000999b
class htb 1:30 parent 1:1 prio 5 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:40 parent 1:1 prio 6 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:50 parent 1:1 prio 7 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:8 parent 1:1 prio 1 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:80 parent 1:1 prio 1 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:18 parent 1:1 prio 3 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:28 parent 1:1 prio 5 rate 80000bit ceil 8000Mbit burst 1609b 
cburst 1000999b
class htb 1:38 parent 1:1 prio 5 rate 40000bit ceil 8000Mbit burst 1604b 
cburst 1000999b
class htb 1:48 parent 1:1 prio 6 rate 40000bit ceil 1200Kbit burst 1604b 
cburst 1749b
class htb 1:58 parent 1:1 prio 7 rate 40000bit ceil 1200Kbit burst 1604b 
cburst 1749b
root@Arzamas:/etc/init.d#

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Re: [LARTC] TC basic match problems

[Michal Soltys]

Peter Rabbitson wrote:
> Hello,
> 
> I am attempting to match on a single bit of the NF mark value, and after 
> hours of reading and googling I can not get the syntax right. It got to 
> be something very simple, yet I can't find it. Any help will be greatly 
> appreciated.
> 

Hmm

wouldn't something like:

tc filter add dev eth0 proto ip prio 1 parent 1:0 u32 match mark 0x80 0x80 
flowid 1:1

suffice ?

> 
> root@Arzamas:/etc/init.d# tc filter add dev wan_b protocol ip prio 2 
> parent 1:0 basic match meta\(nf_mark mask 0x80 eq 0x80\) flowid 1:0x80
> RTNETLINK answers: No such file or directory
> We have an error talking to the kernel

Are required modules loaded and/or options compiled ?

The syntax seems fine.
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Re: [LARTC] TC basic match problems

[Peter Rabbitson]

Michal Soltys wrote:
> Peter Rabbitson wrote:
>> Hello,
>>
>> I am attempting to match on a single bit of the NF mark value, and 
>> after hours of reading and googling I can not get the syntax right. It 
>> got to be something very simple, yet I can't find it. Any help will be 
>> greatly appreciated.
>>
> 
> Hmm
> 
> wouldn't something like:
> 
> tc filter add dev eth0 proto ip prio 1 parent 1:0 u32 match mark 0x80 
> 0x80 flowid 1:1
> 
> suffice ?
> 

It certainly will, granted you have to know that u32 actually supports
it (for more than 3 years now). Thanks a ton for the pointer!

P.S. Sigh... tc is such a mess...

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