tree 9e4f5052cea423ec1302e2175211d58adee0e300
parent edfb6a148ce62e5e19354a1dcd9a34e00815c2a1
author Jason Wang <jasowang@redhat.com> 1358913553 +0000
committer David S. Miller <davem@davemloft.net> 1358966826 -0500

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>