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"
Cc: Alexey Kuznetsov
Cc: James Morris
Cc: Hideaki YOSHIFUJI
Cc: Patrick McHardy
Cc: Eric Dumazet
Cc: Pavel Emelyanov
Cc: Cyrill Gorcunov
Signed-off-by: Andrey Vagin
--
1.8.5.3
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