On 14/01/2019 10:59, Henry Yen wrote:
This patch uses nfct_help() to detect whether an
established connection needs conntrack helper instead of using
test_bit(IPS_HELPER_BIT, &ct->status).

The reason is that IPS_HELPER_BIT is only set when using explicit
CT target.

However, in the case that a device enables conntrack helper via
command "echo 1 > /proc/sys/net/netfilter/nf_conntrack_helper",
the status of IPS_HELPER_BIT will not present any change, and
consequently it loses the checking ability in the context.

Signed-off-by: Henry Yen <henry....@mediatek.com>
Reviewed-by: Ryder Lee <ryder....@mediatek.com>
Tested-by: John Crispin <j...@phrozen.org>
---
  net/netfilter/nft_flow_offload.c | 5 ++++-
  1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c
index 974525eb92df..de4684cc4633 100644
--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -12,6 +12,7 @@
  #include <net/netfilter/nf_conntrack_core.h>
  #include <linux/netfilter/nf_conntrack_common.h>
  #include <net/netfilter/nf_flow_table.h>
+#include <net/netfilter/nf_conntrack_helper.h>
struct nft_flow_offload {
        struct nft_flowtable    *flowtable;
@@ -71,6 +72,7 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
        struct flow_offload *flow;
        enum ip_conntrack_dir dir;
        struct nf_conn *ct;
+       const struct nf_conn_help *help;
        int ret;
if (nft_flow_offload_skip(pkt->skb))
@@ -88,7 +90,8 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
                goto out;
        }
- if (test_bit(IPS_HELPER_BIT, &ct->status))
+       help = nfct_help(ct);
+       if (help)
                goto out;
if (ctinfo == IP_CT_NEW ||

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