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authorPablo Neira Ayuso <pablo@netfilter.org>2023-10-24 21:09:47 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2023-10-25 11:35:46 +0200
commit735795f68b37e9bb49f642407a0d49b1631ea1c7 (patch)
treedb5d84ee8206b6df761114f647a233c6b091979d /net
parentd2a0fc372aca561556e765d0a9ec365c7c12f0ad (diff)
netfilter: flowtable: GC pushes back packets to classic path
Since 41f2c7c342d3 ("net/sched: act_ct: Fix promotion of offloaded unreplied tuple"), flowtable GC pushes back flows with IPS_SEEN_REPLY back to classic path in every run, ie. every second. This is because of a new check for NF_FLOW_HW_ESTABLISHED which is specific of sched/act_ct. In Netfilter's flowtable case, NF_FLOW_HW_ESTABLISHED never gets set on and IPS_SEEN_REPLY is unreliable since users decide when to offload the flow before, such bit might be set on at a later stage. Fix it by adding a custom .gc handler that sched/act_ct can use to deal with its NF_FLOW_HW_ESTABLISHED bit. Fixes: 41f2c7c342d3 ("net/sched: act_ct: Fix promotion of offloaded unreplied tuple") Reported-by: Vladimir Smelhaus <vl.sm@email.cz> Reviewed-by: Paul Blakey <paulb@nvidia.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_flow_table_core.c14
-rw-r--r--net/sched/act_ct.c7
2 files changed, 14 insertions, 7 deletions
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index 1d34d700bd09..920a5a29ae1d 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -316,12 +316,6 @@ void flow_offload_refresh(struct nf_flowtable *flow_table,
}
EXPORT_SYMBOL_GPL(flow_offload_refresh);
-static bool nf_flow_is_outdated(const struct flow_offload *flow)
-{
- return test_bit(IPS_SEEN_REPLY_BIT, &flow->ct->status) &&
- !test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
-}
-
static inline bool nf_flow_has_expired(const struct flow_offload *flow)
{
return nf_flow_timeout_delta(flow->timeout) <= 0;
@@ -407,12 +401,18 @@ nf_flow_table_iterate(struct nf_flowtable *flow_table,
return err;
}
+static bool nf_flow_custom_gc(struct nf_flowtable *flow_table,
+ const struct flow_offload *flow)
+{
+ return flow_table->type->gc && flow_table->type->gc(flow);
+}
+
static void nf_flow_offload_gc_step(struct nf_flowtable *flow_table,
struct flow_offload *flow, void *data)
{
if (nf_flow_has_expired(flow) ||
nf_ct_is_dying(flow->ct) ||
- nf_flow_is_outdated(flow))
+ nf_flow_custom_gc(flow_table, flow))
flow_offload_teardown(flow);
if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) {
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 7c652d14528b..0d44da4e8c8e 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -278,7 +278,14 @@ err_nat:
return err;
}
+static bool tcf_ct_flow_is_outdated(const struct flow_offload *flow)
+{
+ return test_bit(IPS_SEEN_REPLY_BIT, &flow->ct->status) &&
+ !test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
+}
+
static struct nf_flowtable_type flowtable_ct = {
+ .gc = tcf_ct_flow_is_outdated,
.action = tcf_ct_flow_table_fill_actions,
.owner = THIS_MODULE,
};