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Commit 93be6ce0 authored by Andrey Vagin's avatar Andrey Vagin Committed by David S. Miller
Browse files

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: default avatarAndrey Vagin <avagin@openvz.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ceaa1fef

include/uapi/linux/tcp.h

+1 −0
Original line number Diff line number Diff line
@@ -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 −0
Original line number Diff line number Diff line
@@ -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;

	}