netfilter: xt_connlimit: connlimit-above early loop termination

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The patch below introduces an early termination of the loop that is
counting matches. It terminates once the counter has exceeded the
threshold provided by the user. There's no point in continuing the loop
afterwards and looking at other entries.

It plays together with the following code further below:

return (connections > info->limit) ^ info->inverse;

where connections is the result of the counted connection, which in turn
is the matches variable in the loop. So once

        -> matches = info->limit + 1
alias   -> matches > info->limit
alias   -> matches > threshold

we can terminate the loop.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

...

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Stefan Berger 2011-02-11 18:00:07 +01:00 • committed by Patrick McHardy

parent c16e19c117

commit 44bd4de9c2

1 changed files with 10 additions and 3 deletions

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net/netfilter/xt_connlimit.c

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