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quota2: add a no-change mode

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This commit adds an option to xt_quota2 called "no-change". The
effect of this option, when used, is that it will skip incrementing
or decrementing the quota counter, effectively providing a quota test
only.

The reason for implementing this is so that I could have a rule check
if quota is available for a rule in the PREROUTING tables, without
actually decrementing the amount of available quota. I only wanted to
decrement the amount of available quota in the FORWARD rule.
Otherwise, the first packet of every connection would be counted
twice.
This commit is contained in:
Michael Farrell
2009-12-29 01:53:57 +10:30
committed by Jan Engelhardt
parent c82da14d2b
commit 7952a7d253
5 changed files with 44 additions and 16 deletions
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3
extensions/xt_quota2.Kconfig
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@@ -5,4 +5,5 @@ config NETFILTER_XT_MATCH_QUOTA2
This option adds the "quota2" match which is an advanced form of
xt_quota that also allows counting upwards, and where the counter can
be set through procfs. This allows for simple interfacing of
accounting information.
accounting information. It also allows for a test mode without changing
the quota value.