OFD locks logic reuses existing locks c/r functionality.

https://github.com/xemul/criu/issues/42
travis-ci: success for series starting with [1/2] locks: Add ofd locks c/r
Signed-off-by: Begunkov Pavel <asml.silence@gmail.com>
Signed-off-by: Eugene Batalov <eabatalov89@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Unfortunately the kernel wakes up only one waiter even
if they waits with MSG_PEEK, so the introduced scheme doesn't work.

Reported-by: Mr Jenkins
travis-ci: success for Revert "zdtm: use a unix socket instead of a pipe to synchronizer processes"
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

With `-r` option relocation to parasite_service
was not made on ARM:
0x76dbc018:	bl	0x76dbc018		0xebfffffe
(You may saw it with objdump also).

This leaded to hang at "Putting tsock" message:
(01.368297) ----------------------------------------
(01.368321)
(01.368339) Collecting fds (pid: 13503)
(01.368360) ----------------------------------------
(01.368535) Found 3 file descriptors
(01.368564) ----------------------------------------
(01.368648) Dump private signals of 13503
(01.368708) Dump shared signals of 13503
(01.368761) Parasite syscall_ip at 0x10000
(01.369605) Set up parasite blob using memfd
(01.369641) Putting parasite blob into 0x76cc5000->0x76e1f000
(01.369755) Dumping GP/FPU registers for 13503
(01.369818) Putting tsock into pid 13503

Link against lib.a which also fixes build for aarm64.
Reported-by: alex vk <avankemp@gmail.com>
Reported-by: long.wanglong <long.wanglong@huawei.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Backported-from-criu-dev-by: Dmitry Safonov <dsafonov@virtuozzo.com>

So, this time we had TCP transitional states support, but it was
in semi-finished libsoccr library :) And in order to have the TCP
C/R fixed we fixed the library and are now ready to release them
both.

Said that, two main features of the Waxwing release are

* libsoccr -- the library for TCP sockets C/R
* TCP transitional states C/R

Also we have a set of bugfixes, caught performance issue on Xen
and a little bit more.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

As described in issue #268, breakpoints degrades restore performance
in Xen guests. Untill we find out what's going on we disable them.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

It's the same as libsoccr_resume, but doesn't mess with
the socket file descriptor. Just release the handle.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

This test construct both ends of tcp connections and
check that it works in both directions.

travis-ci: success for soccr: add a test
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [1/2] tcp: Move window checking code into cr-check.c
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [1/2] tcp: Move window checking code into cr-check.c
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Only sockets in the repair mode can be bound to the same
port a few time, what is required to restore tcp connects.

v2: move bind() into libsoccr
v3: fix an error message
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

There will be calls that return objects from inside library
and vice versa -- accept objects from caller. Let's have a
flag controlling who's going to free the mem in question.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

CID 173075 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking data suggests that it may be null, but it has already been dereferenced on all paths leading to the check.

travis-ci: success for soccr: don't dereference data before null check
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Looks like it is internal logic too, so it may be better to move into the library too.

travis-ci: success for soccr: restore queues from soccr
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for scripts/install-debian-packages: add libnet-dev
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

These hooks opens inetsk.img, but it doesn't exist if
processes were pre-dumped.

travis-ci: success for test: skip pre-dump images in socket-tcp*.hook
Reported-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

They have to be the same on each iteration.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Check source and destination addresses for closed tcp sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Check source and destination addresses for closed tcp sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

TCP_CLOSING both sides have shutdown but we still have
            data we have to finish sending

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

TCP_CLOSE_WAIT remote side has shutdown and is waiting for
               us to finish writing our data and to shutdown
               (we have to close() to move on to LAST_ACK)

TCP_LAST_ACK   out side has shutdown after remote has
               shutdown.  There may still be data in our
               buffer that we have to finish sending

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

TCP_FIN_WAIT1 our side has shutdown, waiting to complete
	  transmission of remaining buffered data

TCP_FIN_WAIT2 all buffered data sent, waiting for remote
	  to shutdown

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

libsoccr knows how to restore these sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

soccr already knows how to restore this sockets.

CRIU has to ...:
* unlock all packets with the SOCCR_MARK mark
* request half-closed socket via socket_diag
* transpit src and dst addresses to libsoccr

v2: remove SOCCR_FLAGS_ACKED_FIN
travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

If a socket has been closed, it still has both addresses and
we need to dump them.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

For that we restore all sockets properties and then
disable the repair mode before calling connect() and
the kernel will sent a syn packet and move the socket
into the sys-sent state.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

A socket is in one of half-closed states, if it sent a fin packet
or it received a fin packet.

CRIU plays with fin packets to restore half-closed states too.

When we need to sent a fin packet from a socket, we can call
shutdown(SHUT_WR). When a fin packet has to be restore in
a received queue, criu generate a fin packet and send it via
a raw ip socket.

A raw packet is sent with the SOCCR_MARK mark to be able
to not block it.

v2: remove the SOCCR_FLAGS_ACKED_FIN flag
    introduce sets of bits for different actions with fin packets

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

We will need to disable the repair mode before connect()
to restore syn-sent sockets. And even now connect() looks
like a part of internal logic of libsoccr.

travis-ci: success for series starting with [01/21] build: install libnet-dev
v2: remove libsoccr_set_sk_data_unbound() from soccr.h
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

These addresses will be used to restore half-closed sockets,
we will need to send a fake fin packet for that.

And in the next patch connect() will be moved into soccr.
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

loge() will start a message with "Error:" and
logd() will start a message with "Debug:".
logerr() will add strerror(errno) to the end of messages.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

We get sockets from task_diag, then we block network and dump sockets.

A socket state can be changed between first two steps, so lets get
a socket state on the third step and dump it.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Without this patch when we change libsoccr, criu isn't rebuilt.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Originally the repair mode could be enable only for sockets
in closed and established states. Starting with the 4.10 kernel,
it is possible to enable the repair mode for all connected sockets
and now we can dump syn-sent and half closed sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

It will be used to generate tcp packets for restoring half-closed sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Some of the loge messages where missing a '\n'. For consistency this
adds '\n' to all messages which were missing it.

travis-ci: success for libsoccr debug/info messages (rev2)
Signed-off-by: Adrian Reber <areber@redhat.com>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Initialize logging function and log_level for libsoccr.
Otherwise all soccr messages are skipped.

travis-ci: success for libsoccr debug/info messages
Reported-by: Adrian Reber <adrian@lisas.de>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Without this, any rebuild fails with:

make[1]: Entering directory '/home/ubuntu/criu'
make[1]: Entering directory '/home/ubuntu/criu'
  GEN      .gitid
  GEN      criu/include/config.h
  GEN      /home/ubuntu/criu/criu/include/version.h
make[1]: 'compel/plugins/std.built-in.o' is up to date.
make[1]: Leaving directory '/home/ubuntu/criu'
ln: failed to create symbolic link '/home/ubuntu/criu/soccr/config.h': File exists
Makefile:217: recipe for target '/home/ubuntu/criu/soccr/config.h' failed
make: *** [/home/ubuntu/criu/soccr/config.h] Error 1
make: *** Waiting for unfinished jobs....
make[1]: Entering directory '/home/ubuntu/criu'
make[1]: 'compel/compel-host' is up to date.
make[1]: Leaving directory '/home/ubuntu/criu'
make[1]: Leaving directory '/home/ubuntu/criu'
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>