[PATCH 00/10] RFC/RFT: Optionally copy all routes and addresses for pasta, allow gateway-less routes

[Stefano Brivio <sbrivio@redhat.com>]

This series, along with pseudo-related fixes, enables:

- optional copy of all routes from selected interface in outer
  namespace, to (hopefully!) fix the issue reported by Callum at:
    https://github.com/containers/podman/issues/18539

- optional copy of all addresses, mostly for consistency. It doesn't,
  however, enable assignment of multiple addresses in the sense
  requested at:
    https://bugs.passt.top/show_bug.cgi?id=47

  because the addresses still need to be present on the host, and
  the "outer" address isn't selected depending on the address used
  inside the container

- operation without a gateway address, to (again, hopefully) support
  usage of Wireguard endpoints established outside the container,
    https://bugs.passt.top/show_bug.cgi?id=49

I tested the single functionalities introduced here, but I didn't
try to reproduce the setups where the issues were reported, so some
help with testing is definitely fundamental here. Thanks.

Stefano Brivio (10):
  netlink: Fix comment about response buffer size for nl_req()
  pasta: Improve error handling on failure to join network namespace
  netlink: Add functionality to copy routes from outer namespace
  conf: --config-net option is for pasta mode only
  conf, pasta: With --config-net, copy all routes by default
  Revert "conf: Adjust netmask on mismatch between IPv4 address/netmask
    and gateway"
  conf: Don't exit if sourced default route has no gateway
  netlink: Add functionality to copy addresses from outer namespace
  conf, pasta: With --config-net, copy all addresses by default
  passt.h: Fix description of pasta_ifi in struct ctx

 conf.c    |  81 ++++++++++++++++++++---------------
 netlink.c | 123 +++++++++++++++++++++++++++++++++++++++---------------
 netlink.h |  13 ++++--
 passt.1   |  25 ++++++++++-
 passt.h   |   8 +++-
 pasta.c   |  26 ++++++++----
 6 files changed, 195 insertions(+), 81 deletions(-)

-- 
2.39.2