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-rw-r--r--target/linux/generic/hack-4.14/941-fix-checking-method-of-conntrack-helper.patch51
1 files changed, 51 insertions, 0 deletions
diff --git a/target/linux/generic/hack-4.14/941-fix-checking-method-of-conntrack-helper.patch b/target/linux/generic/hack-4.14/941-fix-checking-method-of-conntrack-helper.patch
new file mode 100644
index 0000000000..1afa3e3c1d
--- /dev/null
+++ b/target/linux/generic/hack-4.14/941-fix-checking-method-of-conntrack-helper.patch
@@ -0,0 +1,51 @@
+From addf8974ce9987e2946e04624fe806a98390786e Mon Sep 17 00:00:00 2001
+From: HsiuWen Yen <y.hsiuwen@gmail.com>
+Date: Wed, 30 Jan 2019 11:45:25 +0800
+Subject: [PATCH] fix checking method of conntrack helper
+
+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 for this modification is that IPS_HELPER_BIT is only set when
+the conntrack helper is attached by explicit CT target.
+
+However, in the case that a device enables conntrack helper via the other
+ways (e.g., command "echo 1 > /proc/sys/net/netfilter/nf_conntrack_helper")
+, the status of IPS_HELPER_BIT will not present any change. That means the
+IPS_HELPER_BIT might lose the checking ability in the context.
+
+Signed-off-by: HsiuWen Yen <y.hsiuwen@gmail.com>
+---
+ net/netfilter/xt_FLOWOFFLOAD.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+--- a/net/netfilter/xt_FLOWOFFLOAD.c
++++ b/net/netfilter/xt_FLOWOFFLOAD.c
+@@ -12,6 +12,7 @@
+ #include <net/ip.h>
+ #include <net/netfilter/nf_conntrack.h>
+ #include <net/netfilter/nf_flow_table.h>
++#include <net/netfilter/nf_conntrack_helper.h>
+
+ static struct nf_flowtable nf_flowtable;
+ static HLIST_HEAD(hooks);
+@@ -245,6 +246,7 @@ flowoffload_tg(struct sk_buff *skb, const struct xt_action_param *par)
+ struct nf_flow_route route;
+ struct flow_offload *flow;
+ struct nf_conn *ct;
++ const struct nf_conn_help *help;
+
+ if (xt_flowoffload_skip(skb))
+ return XT_CONTINUE;
+@@ -264,7 +266,8 @@ flowoffload_tg(struct sk_buff *skb, const struct xt_action_param *par)
+ return XT_CONTINUE;
+ }
+
+- if (test_bit(IPS_HELPER_BIT, &ct->status))
++ help = nfct_help(ct);
++ if (help)
+ return XT_CONTINUE;
+
+ if (ctinfo == IP_CT_NEW ||
+