Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We will need to reuse this code in criu library, where libc calls
are present thus we will be compiling it in shared mode.

Because internal syscalls library won't be needed we wrap them
with __sys macro which would hide the details of invocation depending
on CR_NOGLIBC preprocessor variable passed from command line.
Original-patch-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's not a problem now but in future we might need
some special flags to be passed here.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Tun files are attached to tun links, thus we need the latter to
be dumped together with the former.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Reading from NetDeviceEntry directly is not safe
and may cause buffer overflow. Use stlcpy helper.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Same as kernel provides, adopted from Linux sources.

strlcpy is similar to strncpy but _always_ adds \0
at the end of string even if destination is shorter.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The kernel was compiled without the tun driver.

This reverts commit 889a2129.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

setuid and setgid drops the dumpable flag, so it should be set back.
Otherwise proccesses will not able to read a few files in proc (e.g.
/proc/pid/pagemap).

This patch affects cow01:
11:50:04.429:     4: ERR: cow01.c:99: Unable to read data (errno = 13 (No such file or directory))

v2: typo fix
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This reverts commit 21d94e00.

This patch was created for investigating
https://bugzilla.openvz.org/show_bug.cgi?id=2676

The bug is fixed and this patch does nothing useful, because tcpdump
starts too late.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

(00.023059)   3898: Error (page-read.c:129): Can't read mapping page -1: Bad address
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This patch fixes running into loop and data loss, when dumping
semi-closed unix stream connection.

patchv2 has error check, that was missed in v1.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We have generic do_pb_show() call and tons of show_foo
routines, that just call one with proper args. Compact
the code by putting the args into array and calling
the do_pb_show() in one place.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Tap-s and Veth-s can change one, need to keep it.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The recv-fd stage is only required if we created any transport fd.
The post-open one is only required if there's at least one fdtype
with post-open callback in ops.

Both things can be evaluated in advance and unneeded stages can
be skipped.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

These contain linkage between number, data type and routines
for pb messages we write/read to/from image files. Most of them
have simple number-type-routines mapping, so introduce a generating
script for that.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

There's some strange setup on Jenkins boxes, so that /dev/net/tun
is inaccessible. Need to check this after holidays :(
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This thing is pretty straightforward -- on netns creation
populate it with tun-s, after this collect tun files, open
and attach them with regular fd-s engine.

One tricky thing -- when populating namespace with tun links
make them all persistent and drop this flag (if required)
later, when the first alive opened appears.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The major issue with dump is -- some info id get via netlink,
some via sysfs and some (!) via opened and attached tun file.
But the latter cannot be created, if there's another one attached
(or the mq device is full with threads).

Thus we have to dump this info via existing tun file and keep one
in memory till the link dump code takes place.

Opposite situation is also possible -- we can have a persistent
unattached device. In this case we have to attach to it, dump
things and detach back.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

There will be two entities handled:

1. tun file -- an opened char device with misc major and tun minor
   that can be attached to item #2

2. tun netdevice -- another type of links
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

TUN devices are created with ioctl, but their parameters (e.g.
flags with state, mtu, etc.) are to be restored with generic
RTM_SETLINK message.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's not quite clean, but on dump non-seekable files dump 0xff...ff into
64-bit pos field of the image. Thus on restore we'd face an error in the
do_open_reg. In order not to have separate helper for non-seekable files
just skip the position restore for such.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Just a small helper, that reads string from ns' sysfs mount.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Some information about network devices may hide in sysfs, thus
it's required to have one at hands while dumping the netns.

Create the detached mount for that.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Some (most) network devices would like to have NetDeviceEntry with
more fields, than currently present (and enough for lo and veth).
Prepare for that by allowing them to define their own callback that
would fill the resor of the pb entry and call write_netdev_img().
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The option can run test with specified name directly without check
or match.

It can be used to run experimental test that is not in TEST_LIST.
Signed-off-by: Yicheng Qin <yichengq@google.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Now we have a set of cinfo-s, it's possible to collect all
this stuff in a plan for-loop.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>