netfilter: flowtable: Fix flushing of offloaded flows on free
Freeing a flowtable with offloaded flows, the flow are deleted from
hardware but are not deleted from the flow table, leaking them,
and leaving their offload bit on.
Add a second pass of the disabled gc to delete the these flows from
the flow table before freeing it.
Fixes:
c29f74e0df7a ("netfilter: nf_flow_table: hardware offload support")
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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