LARTC - Jul 2001 - CBQ: U32 selector question : filtering all the port > a value

Hi all,

I saw that the u32 selector can match a PATTERN so I can use it to
filter on a port value like :

tc filter add dev eth0 parent 10;10 protocol ip prio 100 u32 match ip
sport 0x0014 0xffff flowid 10:100

(filter on the ftp-data (20) source port)

But is there a method to filter all the source ports > 40000 for example
?


regards,
------------------------------------------------
Franck BALAZOT (fbalazot@aeta.fr)
AETA.COM
361, Avenue du Général De Gaulle
92140 CLAMART
FRANCE
Tél:01.41.36.12.93
------------------------------------------------

Finaly I tried to filter port > 32768 (bit 15=1 : 0x8000)

with :

tc filter add dev eth0 parent 10;10 protocol ip prio 100 u32 match ip
sport 0x8000 0x8000 flowid 10:100


It seems to work fine, but I need to do more tests.


Nikolai Vladychevski wrote:
> Franck BALAZOT wrote:
> >
> > Hi all,
> >
> > I saw that the u32 selector can match a PATTERN so I can use it to
> > filter on a port value like :
> >
> > tc filter add dev eth0 parent 10;10 protocol ip prio 100 u32 match ip
> > sport 0x0014 0xffff flowid 10:100
> >
> > (filter on the ftp-data (20) source port)
> >
> > But is there a method to filter all the source ports > 40000 for
example
> > ?
> >
>
> 40,000 into HEX will be 0x9c40
> converting into binary it will be 1001110001000000
>
> you have to use the mask to match only the highest 10 bits, so in binary
> it will be 1111111111000000 wich in HEX will be 0x03ff , that''s
your
> mask.
>
> finaly it will be:
> tc filter add dev eth0 parent 10;10 protocol ip prio 100 u32 match ip
> sport 0x0000 0x03ff flowid 10:100
>
> well, but that''s the theory, i never tried it, can you test it and
reply
> me back if it did work or not?
>
> thanks
> nikolai
--
------------------------------------------------
Franck BALAZOT (fbalazot@aeta.fr)
AETA.COM
361, Avenue du Général De Gaulle
92140 CLAMART
FRANCE
Tél:01.41.36.12.93
------------------------------------------------