[CRIU] [PATCH 0/11 v2] Dump and restore nested network namespaces

[Dmitry Safonov]

2017-02-02 3:04 GMT+03:00 Andrei Vagin <avagin at openvz.org>:
> From: Andrei Vagin <avagin at virtuozzo.com>
>
> This is an initial support for nested network namespaces.

On the top of this patches set I did patches to make it more generic
and afterward the patch to C/R nested UTS using generic logic
is "Showing 5 changed files with 18 additions and 9 deletions".
One could find it here: https://github.com/0x7f454c46/criu/commits/sub-ns
My patches set still needs tests and IPC C/R, I'll post it on top of this one
when it makes into criu-dev :)

FWIW:
Reviewed-by: Dmitry Safonov <dsafonov at virtuozzo.com>

>
> It was implemented to handle systemd services with private networks:
>
> """
> When PrivateNetwork=yes is set in the [Service] section of a systemd service
> unit file, the processes run for the service will run in a private network
> namespace whith a private loopback network interface, and no other network
> devices.
> """
>
> How it works:
> * All network devices are restored in the root task.
> * A process sets an required network namespace to restore a socket
> * Processes sets their network namespaces after restoring all sockets (files)
>
> Known issues:
> * veth devices between network namespaces are not supported
>
> v2: * fix commetns from Pavel
>     * improve the test to check that all processes are not restored
>       in one netns
>     * drop patches with a new ioctl to get netns for unconnected and
>       unbound sockets, because it is not in the upstream kernel.
>
> Andrei Vagin (8):
>   net: save network namespaces for sockets
>   net: bind and listen a parasite socket for each network namespace
>   net: allow to dump and restore more than one network namespace
>   net: set a proper network namespace to create a socket
>   net: rename pid into nsid for prepare_net_ns()
>   files: split collect_fd on allocate_fd and handle_fd
>   files: add a function to reopen fd as an unused fd
>   zdtm: add a test for nested network namespaces
>
>  criu/cr-restore.c               |  40 ++++++--
>  criu/files.c                    |  82 ++++++++++++++--
>  criu/include/files.h            |   3 +
>  criu/include/libnetlink.h       |   5 +-
>  criu/include/namespaces.h       |   4 +-
>  criu/include/net.h              |   6 +-
>  criu/include/parasite.h         |   2 +
>  criu/include/sk-packet.h        |   2 +-
>  criu/include/sockets.h          |  11 ++-
>  criu/libnetlink.c               |  13 +--
>  criu/namespaces.c               |   6 +-
>  criu/net.c                      | 187 +++++++++++++++++++++++++++++++-----
>  criu/parasite-syscall.c         |  22 +----
>  criu/pstree.c                   |   4 +
>  criu/sk-inet.c                  |  21 ++++-
>  criu/sk-netlink.c               |  19 +++-
>  criu/sk-packet.c                |  10 +-
>  criu/sk-unix.c                  |  17 +++-
>  criu/sockets.c                  |  70 ++++++++++----
>  images/packet-sock.proto        |   1 +
>  images/sk-inet.proto            |   1 +
>  images/sk-netlink.proto         |   1 +
>  images/sk-packet.proto          |   1 +
>  images/sk-unix.proto            |   2 +
>  test/zdtm/static/Makefile       |   1 +
>  test/zdtm/static/netns_sub.c    | 203 ++++++++++++++++++++++++++++++++++++++++
>  test/zdtm/static/netns_sub.desc |   1 +
>  27 files changed, 630 insertions(+), 105 deletions(-)
>  create mode 100644 test/zdtm/static/netns_sub.c
>  create mode 100644 test/zdtm/static/netns_sub.desc
>
> --
> 2.7.4

-- 
             Dmitry