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-rw-r--r--net/netfilter/xt_time.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/net/netfilter/xt_time.c b/net/netfilter/xt_time.c
index c13bcd0ab491..8dbb4d48f2ed 100644
--- a/net/netfilter/xt_time.c
+++ b/net/netfilter/xt_time.c
@@ -163,19 +163,24 @@ time_mt(const struct sk_buff *skb, struct xt_action_param *par)
s64 stamp;
/*
- * We cannot use get_seconds() instead of __net_timestamp() here.
+ * We need real time here, but we can neither use skb->tstamp
+ * nor __net_timestamp().
+ *
+ * skb->tstamp and skb->skb_mstamp_ns overlap, however, they
+ * use different clock types (real vs monotonic).
+ *
* Suppose you have two rules:
- * 1. match before 13:00
- * 2. match after 13:00
+ * 1. match before 13:00
+ * 2. match after 13:00
+ *
* If you match against processing time (get_seconds) it
* may happen that the same packet matches both rules if
- * it arrived at the right moment before 13:00.
+ * it arrived at the right moment before 13:00, so it would be
+ * better to check skb->tstamp and set it via __net_timestamp()
+ * if needed. This however breaks outgoing packets tx timestamp,
+ * and causes them to get delayed forever by fq packet scheduler.
*/
- if (skb->tstamp == 0)
- __net_timestamp((struct sk_buff *)skb);
-
- stamp = ktime_to_ns(skb->tstamp);
- stamp = div_s64(stamp, NSEC_PER_SEC);
+ stamp = get_seconds();
if (info->flags & XT_TIME_LOCAL_TZ)
/* Adjust for local timezone */