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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" <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: James Morris <[email protected]>
Cc: Hideaki YOSHIFUJI <[email protected]>
Cc: Patrick McHardy <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Signed-off-by: Andrey Vagin <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Andrey Vagin
2013-02-13 13:22:15 -05:00
committed by David S. Miller
parent ceaa1fef65
commit 93be6ce0e9
2 changed files with 10 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/uapi/linux/tcp.h
+1
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;
net/ipv4/tcp.c
+9
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;
}