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netfilter: nf_flow_table: in flow_offload_lookup, skip entries being deleted

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Preparation for sending flows back to the slow path

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Felix Fietkau 2018-02-26 10:15:22 +01:00 committed by Pablo Neira Ayuso
parent 59c466dd68
commit ba03137f4c
1 changed files with 15 additions and 2 deletions
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17
net/netfilter/nf_flow_table_core.c
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@ -184,8 +184,21 @@ struct flow_offload_tuple_rhash *
flow_offload_lookup(struct nf_flowtable *flow_table,
struct flow_offload_tuple *tuple)
{
return rhashtable_lookup_fast(&flow_table->rhashtable, tuple,
nf_flow_offload_rhash_params);
struct flow_offload_tuple_rhash *tuplehash;
struct flow_offload *flow;
int dir;
tuplehash = rhashtable_lookup_fast(&flow_table->rhashtable, tuple,
nf_flow_offload_rhash_params);
if (!tuplehash)
return NULL;
dir = tuplehash->tuple.dir;
flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
if (flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN))
return NULL;
return tuplehash;
}
EXPORT_SYMBOL_GPL(flow_offload_lookup);