netdev - Re: [RFC] IPVS: secure_tcp does provide alternate state timeouts

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Date:	Thu, 29 Sep 2011 18:01:56 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Julian Anastasov <ja@....bg>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [RFC] IPVS: secure_tcp does provide alternate state timeouts

On Thu, Sep 29, 2011 at 11:47:10AM +0300, Julian Anastasov wrote:
> 
> 	Hello,
> 
> On Thu, 29 Sep 2011, Simon Horman wrote:
> 
> > * Also reword the test to make it read more easily (to me)
> > 
> > Signed-off-by: Simon Horman <horms@...ge.net.au>
> > 
> > ---
> > 
> > Julian, I don't see that IPVS currently implements alternate
> > timeouts for secure_tcp. Am I missing something?
> 
> 	Yes, only states are changed. What is missing is a
> libipvs support to modify per-protocol timeouts because they
> are not exported to /proc anymore. As the states have name,
> may be we can implement timeout to be set as follows:
> 
> 	ipvsadm --set-state-timeout -p TCP SYN 10
> 
> 	Using 2 timeout tables just for secure_tcp is
> complicated and with the above control it is not needed.

Yes, I agree there is room for improvement.
I guess the best way forward is to use netlink
to allow per-state per-protocol timeout adjustment.

In the mean time, I'll queue this patch up as I think
its good that the documentation reflects the implementation.

> 
> > ---
> >  Documentation/networking/ipvs-sysctl.txt |   10 ++++------
> >  1 files changed, 4 insertions(+), 6 deletions(-)
> > 
> > diff --git a/Documentation/networking/ipvs-sysctl.txt b/Documentation/networking/ipvs-sysctl.txt
> > index 1dcdd49..13610e3 100644
> > --- a/Documentation/networking/ipvs-sysctl.txt
> > +++ b/Documentation/networking/ipvs-sysctl.txt
> > @@ -140,13 +140,11 @@ nat_icmp_send - BOOLEAN
> >  secure_tcp - INTEGER
> >          0  - disabled (default)
> >  
> > -        The secure_tcp defense is to use a more complicated state
> > -        transition table and some possible short timeouts of each
> > -        state. In the VS/NAT, it delays the entering the ESTABLISHED
> > -        until the real server starts to send data and ACK packet
> > -        (after 3-way handshake).
> > +	The secure_tcp defense is to use a more complicated TCP state
> > +	transition table. For VS/NAT, it also delays entering the
> > +	TCP ESTABLISHED state until the three way handshake is completed.
> >  
> > -        The value definition is the same as that of drop_entry or
> > +        The value definition is the same as that of drop_entry and
> >          drop_packet.
> >  
> >  sync_threshold - INTEGER
> > -- 
> > 1.7.5.4
> 
> Regards
> 
> --
> Julian Anastasov <ja@....bg>
> 
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