[LARTC] Re: [Linux Diffserv] ANNOUNCE: tc filter extensions

[jamal <hadi@cyberus.ca>]

Ok, i tested basic stuff and it works. Not very useful example but
should serve to illustrate things:
Example below will log every packet with src ip 127.1.1.1/32 seen at
ingres of dev lo every time it exceeds its allocated rate. the nfmark
is also set to 2 every time the rate is exceeded.

---------- script -------
#
tc qdisc add dev lo ingress
#
tc filter add dev lo parent ffff: protocol ip prio 1 u32  \
match ip src 127.1.1.1/32 \
action police mtu 5000  rate 2500kbit burst 90k pipe \
action ipt -j LOG --log-prefix "1:20 exceeded 2.5mbps" \
action ipt -j mark --set-mark 2

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

Now try to list what we installed

------------------ listing ----------------
jroot# tc filter show parent ffff: dev lo
filter protocol ip pref 1 u32
filter protocol ip pref 1 u32 fh 800: ht divisor 1
filter protocol ip pref 1 u32 fh 800::800 order 2048 key ht 800 bkt 0
flowid 1:20

   action order 1: police 1 action pipe rate 2500Kbit burst 86153b mtu 5000b

   action order 2: tablename: mangle  hook: NF_IP_PRE_ROUTING
        target LOG level warning prefix `1:20 exceded 2.5mbps'  index 1

   action order 3: tablename: mangle  hook: NF_IP_PRE_ROUTING
        target MARK set 0x2  index 2

  match 7f010101/ffffffff at 12

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

Of course this is a 5 minute test.

cheers,
jamal

On Sat, 4 Jan 2003, jamal wrote:

>
>
> Yes, thats is a useful feature.
> Should be able to able use the iptables LOG; I am trying to avoid
> replicating things which already exist; it is very easy to replicate it.
> I'll test iptables LOG sometimes today; if you beat me to it, let me know
> if it works.
>
> cheers,
> jamal
>
> On Sat, 4 Jan 2003, Ciprian Niculescu wrote:
>
> > hello,
> >
> > if someone can develop a feature like -j LOG from iptables, for the tc
> > filter
> >
> > for ex i have
> >
> > tc filter ...... match dport 80 0xffff flowid 1:1
> >
> > i want to write to syslog the headers of the packets that matched this rule.
> >
> > C
> >
> > jamal wrote:
> > >
> > > I guess holidays means idle time which means idle minds which leads to
> > > thumb twiddling which then leads to some work (which is sometimes useful)
> > >
> > > Ive updated the traffic control patches i posted about six months ago.
> > > Note, the current release does not break anything in tc. It is fully
> > > backward compatible so you can choose not to use it and things will work
> > > as they do today. Of course, it is very useful so you cant choose to
> > > ignore it!
> > >
> > > It's now upgraded to better than "use at your own risk" category.
> > > tested on both uni and SMP 2.4.18 and 2.4.20.
> > >
> > > http://www.cyberus.ca/~hadi/patches/action/
> > >
> > > Bug reports and feedback are appreaciated.
> > > A lot more goodies coming up, so this is just the tip. First steps are to
> > > prove sanity of the idea.
> > >
> > > cheers,
> > > jamal
> > >
> > >
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