flow offload of CT can be deleted by the masquerade module. then,
flow offload should be deleted too. but GC and data-path of flow offload
do not check CT's status. hence they will be removed only by the timeout.
GC and data-path routine will check ct->status.
If IPS_DYING_BIT is set, GC will delete CT and data-path routine
do not use it.
Signed-off-by: Taehee Yoo <ap420073@xxxxxxxxx>
---
v2 -> v3 : use nf_ct_is_dying().
v1 -> v2 : use IPS_DYING_BIT instead of ct->ct_general.use refcnt.
net/netfilter/nf_flow_table_core.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index 7aabfd4b1e50..6477a5cbaaa5 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -232,6 +232,7 @@ flow_offload_lookup(struct nf_flowtable *flow_table,
{
struct flow_offload_tuple_rhash *tuplehash;
struct flow_offload *flow;
+ struct flow_offload_entry *e;
int dir;
tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple,
@@ -244,6 +245,10 @@ flow_offload_lookup(struct nf_flowtable *flow_table,
if (flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN))
return NULL;
+ e = container_of(flow, struct flow_offload_entry, flow);
+ if (unlikely(nf_ct_is_dying(e->ct)))
+ return NULL;
+
return tuplehash;
}
EXPORT_SYMBOL_GPL(flow_offload_lookup);
@@ -290,8 +295,10 @@ static inline bool nf_flow_has_expired(const struct flow_offload *flow)
static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data)
{
struct nf_flowtable *flow_table = data;
+ struct flow_offload_entry *e;
- if (nf_flow_has_expired(flow) ||
+ e = container_of(flow, struct flow_offload_entry, flow);
+ if (nf_flow_has_expired(flow) || nf_ct_is_dying(e->ct) ||
(flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN)))
flow_offload_del(flow_table, flow);
}
--
2.17.1
