Messages in this thread | | | From | Andrey Vagin <> | Subject | [PATCH RFC 0/3] tcp: allow to repair a tcp connections in closing states | Date | Fri, 21 Mar 2014 17:32:58 +0400 |
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Currently connections only in the TCP_ESTABLISHED state can be dumped and restored. This series allows to restore connections in the FIN_WAIT_1, FIN_WAIT_2, LAST_ACK, CLOSE_WAIT or CLOSING states.
For restoring closing states we need an ability to restore a fin packet in a queue. In this series I suggest to use the interface of control messages for that.
Here is an example of user-space code:
msg.msg_control = buf; msg.msg_controllen = sizeof buf; cmsg = CMSG_FIRSTHDR(&msg); cmsg->cmsg_level = SOL_TCP; cmsg->cmsg_type = TCP_CMSG_SEND_FIN; cmsg->cmsg_len = CMSG_LEN(0); msg.msg_controllen = cmsg->cmsg_len; if (sendmsg(sk, &msg, 0) < 0) { pr_perror("sendmsg"); return -1; }
Andrey Vagin (3): tcp: allow to enable repair mode for sockets in any state tcp: check repair before fastopen in tcp_sendmsg tcp: add ability to restore a fin packet
include/net/tcp.h | 1 + include/uapi/linux/tcp.h | 3 +++ net/ipv4/tcp.c | 69 +++++++++++++++++++++++++++++++++++++----------- net/ipv4/tcp_input.c | 2 +- 4 files changed, 59 insertions(+), 16 deletions(-)
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> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Andrey Vagin <avagin@openvz.org>
-- 1.8.5.3
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