From b8732fb7f8920e2f6216d2b67faf8b0b0d67ca81 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Wed, 23 Jan 2013 03:59:13 +0000
Subject: [PATCH] tuntap: limit the number of flow caches

We create new flow caches when a new flow is identified by tuntap, This may lead
some issues:

- userspace may produce a huge amount of short live flows to exhaust host memory
- the unlimited number of flow caches may produce a long list which increase the
  time in the linear searching

Solve this by introducing a limit of total number of flow caches.

Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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