This series adds a way to see if an interface cannot be moved to another netns.

v4 -> v5:
 - rebase on top of net-next

v3 -> v4:
 - add patch #1 to the series
 - update following patches accordingly

v2 -> v3:
 - don't copy patch #1 to stable@vger.kernel.org
 - remove the 'Fixes:' tag

v1 -> v2:
 - target the series to net-next
 - patch #1:
   + use NLA_REJECT for the nl policy
   + update the rt link spec
 - patch #2: plumb extack in __dev_change_net_namespace()

 Documentation/netlink/specs/rt_link.yaml           |  3 ++
 .../networking/net_cachelines/net_device.rst       |  2 +-
 Documentation/networking/switchdev.rst             |  2 +-
 drivers/net/amt.c                                  |  2 +-
 drivers/net/bonding/bond_main.c                    |  2 +-
 drivers/net/ethernet/adi/adin1110.c                |  2 +-
 .../net/ethernet/marvell/prestera/prestera_main.c  |  2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c  |  4 +--
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.c   |  2 +-
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c     |  2 +-
 drivers/net/ethernet/rocker/rocker_main.c          |  2 +-
 drivers/net/ethernet/ti/cpsw_new.c                 |  2 +-
 drivers/net/loopback.c                             |  2 +-
 drivers/net/net_failover.c                         |  2 +-
 drivers/net/team/team_core.c                       |  2 +-
 drivers/net/vrf.c                                  |  2 +-
 include/linux/netdevice.h                          |  9 ++---
 include/uapi/linux/if_link.h                       |  1 +
 net/batman-adv/soft-interface.c                    |  2 +-
 net/bridge/br_device.c                             |  2 +-
 net/core/dev.c                                     | 42 +++++++++++++++++-----
 net/core/rtnetlink.c                               |  5 ++-
 net/hsr/hsr_device.c                               |  2 +-
 net/ieee802154/6lowpan/core.c                      |  2 +-
 net/ieee802154/core.c                              | 10 +++---
 net/ipv4/ip_tunnel.c                               |  2 +-
 net/ipv4/ipmr.c                                    |  2 +-
 net/ipv6/ip6_gre.c                                 |  2 +-
 net/ipv6/ip6_tunnel.c                              |  2 +-
 34 files changed, 84 insertions(+), 52 deletions(-)

Comments are welcome.

Regards,
Nicolas