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tcp: allow to turn tcp timestamp randomization off

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Eric says: "By looking at tcpdump, and TS val of xmit packets of multiple
flows, we can deduct the relative qdisc delays (think of fq pacing).
This should work even if we have one flow per remote peer."

Having random per flow (or host) offsets doesn't allow that anymore so add
a way to turn this off.

Suggested-by: Eric Dumazet <[email protected]>
Signed-off-by: Florian Westphal <[email protected]>
Acked-by: Yuchung Cheng <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Florian Westphal 2016-12-01 11:32:07 +01:00 • committed by David S. Miller
commit 25429d7b7d
3 changed files with 11 additions and 4 deletions
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1
net/ipv4/tcp_input.c
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@ -85,6 +85,7 @@ int sysctl_tcp_dsack __read_mostly = 1;
int sysctl_tcp_app_win __read_mostly = 31;
int sysctl_tcp_adv_win_scale __read_mostly = 1;
EXPORT_SYMBOL(sysctl_tcp_adv_win_scale);
EXPORT_SYMBOL(sysctl_tcp_timestamps);
/* rfc5961 challenge ack rate limiting */
int sysctl_tcp_challenge_ack_limit = 1000;