[LARTC] TC bug? Mixing u32 and FW filters.

[mahhy <mahhy@undertow.ca>]

I've noticed some strange behaivour in tc and can't seem to find a 
definate "this is a bug" or "this is not a bug".  Figured I'd ask the list.

I'm using HTB2 and HTB3, on different machines.  This happened on both of 
them.

I've created a few different classes and quite a few filters.  All of my 
filters were previously u32 filters. (wont bother posting the exact 
script, its fairly long, works on 3 separate interfaces, etc)

I started to mark FTP packets using iptables (trying for both active and 
passive ftp), which seems to work fine.

When I added a FW filter:

/sbin/tc filter add dev eth1 protocol ip parent 1: prio 1 handle 5 fw 
classid 1:24

I got the infamous:

RTNETLINK answers: Invalid argument

After a few hours of experimentation, I realized that if I changed the 
filters PRIO to something not used by one of the u32 filters, all went 
well.  i.e.:

/sbin/tc filter add dev eth1 protocol ip parent 1: prio 5 handle 5 fw 
classid 1:24

Has anyone seen this before? Anyone know if it is definately a bug or not?  
Or is it something very strange specific to my setup?

-- 
Rob Rankin
mahhy@undertow.ca
http://undertow.ca

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