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tcp: set and get per-socket timestamp

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A timestamp can be set, only if a socket is in the repair mode.

This patch adds a new socket option TCP_TIMESTAMP, which allows to
get and set current tcp times stamp.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: James Morris <jmorris@namei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrey Vagin 2013-02-11 05:50:18 +00:00 committed by David S. Miller
parent ceaa1fef65
commit 93be6ce0e9
2 changed files with 10 additions and 0 deletions
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1
include/uapi/linux/tcp.h
View file

@ -111,6 +111,7 @@ enum {
#define TCP_QUEUE_SEQ 21
#define TCP_REPAIR_OPTIONS 22
#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */
#define TCP_TIMESTAMP 24
struct tcp_repair_opt {
__u32 opt_code;

9
net/ipv4/tcp.c
View file

@ -2714,6 +2714,12 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
else
err = -EINVAL;
break;
case TCP_TIMESTAMP:
if (!tp->repair)
err = -EPERM;
else
tp->tsoffset = val - tcp_time_stamp;
break;
default:
err = -ENOPROTOOPT;
break;
@ -2962,6 +2968,9 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
case TCP_USER_TIMEOUT:
val = jiffies_to_msecs(icsk->icsk_user_timeout);
break;
case TCP_TIMESTAMP:
val = tcp_time_stamp + tp->tsoffset;
break;
default:
return -ENOPROTOOPT;
}