We need to compute timeout.expires - jiffies, not the other way around.
Add a helper, another patch can then later change more places in
conntrack code where we currently open-code this.
Will allow us to only change one place later when we remove per-ct timer.
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
include/net/netfilter/nf_conntrack.h | 8 ++++++++
net/netfilter/nft_ct.c | 6 +-----
2 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index dd78bea..b6083c3 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -284,6 +284,14 @@ static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
}
+/* jiffies until ct expires, 0 if already expired */
+static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
+{
+ long timeout = (long)ct->timeout.expires - (long)jiffies;
+
+ return timeout > 0 ? timeout : 0;
+}
+
struct kernel_param;
int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
index 137e308..81fbb45 100644
--- a/net/netfilter/nft_ct.c
+++ b/net/netfilter/nft_ct.c
@@ -54,7 +54,6 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
const struct nf_conn_help *help;
const struct nf_conntrack_tuple *tuple;
const struct nf_conntrack_helper *helper;
- long diff;
unsigned int state;
ct = nf_ct_get(pkt->skb, &ctinfo);
@@ -94,10 +93,7 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
return;
#endif
case NFT_CT_EXPIRATION:
- diff = (long)jiffies - (long)ct->timeout.expires;
- if (diff < 0)
- diff = 0;
- *dest = jiffies_to_msecs(diff);
+ *dest = jiffies_to_msecs(nf_ct_expires(ct));
return;
case NFT_CT_HELPER:
if (ct->master == NULL)
--
2.7.3
--
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