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2019 Apr 04
0
[Bug 1332] New: Time-matching extension (--match time) broken by timestamping changes in kernel 4.20 and later
...utput.c") with the
following patch:
- /* Our usage of tstamp should remain private */
- skb->tstamp = 0;
+ /* Leave earliest departure time in skb->tstamp (skb->skb_mstamp_ns) */
Now that the timestamp no longer is cleared, this will end up causing incorrect
matching in function 'time_mt()' (in "net/netfilter/xt_time.c"). The "problem"
is present in the following two lines of code:
if (skb->tstamp == 0)
__net_timestamp((struct sk_buff *)skb);
The above code will check if the packet already has a timestamp or not. If the
timestamp is missing, then the...