Support unix domain sockets across namespaces

This patchset takes a addressing all of the issues that crop up with
unix domain sockets when the senders and receivers are in separate
namespaces.

Without this patchset we can report the wrong pid and uid
values in our unix domain credentials.

As a finally this patchset removes the now unnecessary restriction
that we only allow unix domain sockets between processes in the
same network namespace.

Eric W. Biederman (8):
      scm: Reorder scm_cookie.
      user_ns: Introduce user_nsmap_uid and user_ns_map_gid.
      sock: Introduce cred_to_ucred
      af_unix: Allow SO_PEERCRED to work across namespaces.
      af_netlink: Add needed scm_destroy after scm_send.
      scm: Capture the full credentials of the scm sender.
      af_unix: Allow credentials to work across user and pid namespaces.
      af_unix: Allow connecting to sockets in other network namespaces.

---
 include/linux/socket.h         |    5 ++
 include/linux/user_namespace.h |   14 ++++++
 include/net/af_unix.h          |    4 +-
 include/net/scm.h              |   30 ++++++++++--
 include/net/sock.h             |    3 +-
 kernel/user_namespace.c        |   44 ++++++++++++++++++
 net/core/scm.c                 |   24 ++++++++++
 net/core/sock.c                |   32 +++++++++++---
 net/netlink/af_netlink.c       |   11 +++-
 net/unix/af_unix.c             |   97 +++++++++++++++++++++++++---------------
 10 files changed, 211 insertions(+), 53 deletions(-)
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