* [RFC] IPVS: secure_tcp does provide alternate state timeouts
@ 2011-09-29 7:25 Simon Horman
2011-09-29 8:47 ` Julian Anastasov
0 siblings, 1 reply; 3+ messages in thread
From: Simon Horman @ 2011-09-29 7:25 UTC (permalink / raw)
To: Julian Anastasov; +Cc: lvs-devel, netdev, netfilter-devel, Simon Horman
* Also reword the test to make it read more easily (to me)
Signed-off-by: Simon Horman <horms@verge.net.au>
---
Julian, I don't see that IPVS currently implements alternate
timeouts for secure_tcp. Am I missing something?
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [RFC] IPVS: secure_tcp does provide alternate state timeouts
2011-09-29 7:25 [RFC] IPVS: secure_tcp does provide alternate state timeouts Simon Horman
@ 2011-09-29 8:47 ` Julian Anastasov
2011-09-29 9:01 ` Simon Horman
0 siblings, 1 reply; 3+ messages in thread
From: Julian Anastasov @ 2011-09-29 8:47 UTC (permalink / raw)
To: Simon Horman; +Cc: lvs-devel, netdev, netfilter-devel
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@verge.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.
> ---
> 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@ssi.bg>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [RFC] IPVS: secure_tcp does provide alternate state timeouts
2011-09-29 8:47 ` Julian Anastasov
@ 2011-09-29 9:01 ` Simon Horman
0 siblings, 0 replies; 3+ messages in thread
From: Simon Horman @ 2011-09-29 9:01 UTC (permalink / raw)
To: Julian Anastasov; +Cc: lvs-devel, netdev, netfilter-devel
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@verge.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@ssi.bg>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-09-29 8:47 ` Julian Anastasov
2011-09-29 9:01 ` Simon Horman
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