From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrey Vagin Subject: [PATCH net-next] tcp: add ability to set a timestamp offset Date: Mon, 11 Feb 2013 19:50:16 +0400 Message-ID: <1360597819-23783-1-git-send-email-avagin@openvz.org> Cc: criu@openvz.org, linux-kernel@vger.kernel.org, Andrey Vagin , "David S. Miller" , Alexey Kuznetsov , James Morris , Hideaki YOSHIFUJI , Patrick McHardy , Eric Dumazet , Pavel Emelyanov To: netdev@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org If a TCP socket will get live-migrated from one box to another the timestamps (which are typically ON) will get screwed up -- the new kernel will generate TS values that has nothing to do with what they were on dump. The solution is to yet again fix the kernel and put a "timestamp offset" on a socket. A socket offset is added in places where externally visible tcp timestamp option is parsed/initialized. Connections in the SYN_RECV state are not supported, global tcp_time_stamp is used for them, because repair mode doesn't support this state. In a future it can be implemented by the similar way as for TIME_WAIT sockets. For time-wait sockets offset is inhereted by a proper tcp_sock. A per-socket offset can be set only for sockets in repair mode. Cc: "David S. Miller" Cc: Alexey Kuznetsov Cc: James Morris Cc: Hideaki YOSHIFUJI Cc: Patrick McHardy Cc: Eric Dumazet Cc: Pavel Emelyanov Signed-off-by: Andrey Vagin Andrey Vagin (3): tcp: adding a per-socket timestamp offset tcp: set and get per-socket timestamp tcp: send packets with a socket timestamp include/linux/tcp.h | 3 +++ include/uapi/linux/tcp.h | 1 + net/ipv4/tcp.c | 11 +++++++++++ net/ipv4/tcp_input.c | 8 +++++++- net/ipv4/tcp_ipv4.c | 12 +++++++----- net/ipv4/tcp_minisocks.c | 3 +++ net/ipv4/tcp_output.c | 4 ++-- net/ipv6/tcp_ipv6.c | 22 +++++++++++++--------- 8 files changed, 47 insertions(+), 17 deletions(-) -- 1.7.11.7