diff options
| author | Andrey Vagin | 2013-02-11 05:50:18 +0000 |
|---|---|---|
| committer | David S. Miller | 2013-02-13 13:22:15 -0500 |
| commit | 93be6ce0e91b6a94783e012b1857a347a5e6e9f2 (patch) | |
| tree | 55b7f545fea634d5cde59e21de1470761b7190a7 | |
| parent | ceaa1fef65a7c2e017b260b879b310dd24888083 (diff) | |
tcp: set and get per-socket timestamp
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>
| -rw-r--r-- | include/uapi/linux/tcp.h | 1 | ||||
| -rw-r--r-- | net/ipv4/tcp.c | 9 |
2 files changed, 10 insertions, 0 deletions
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index e962faa5ab0d..6b1ead0b0c9d 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -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; diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 8a90bda96038..801b07b796f0 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -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; } |