The current semantics for selecting an external interface are quite
confusing - depending on details it can pick either the interface
associated with the first default route, or the lowest numbered
interface with a default route, which might not be the same.The logic
for checking the interface in the tests isn't quite identical which
can lead to test failures when there are multiple external routes.

This series fixes that bug and makes a number of follow on clean ups
to the detection / configuration of IP parameters from the host.

David Gibson (7):
  Allow different external interfaces for IPv4 and IPv6 connectivity
  Separately locate external interfaces for IPv4 and IPv6
  Initialize host side MAC when in IPv6 only mode
  Move passt mac_guest init to be more symmetric with pasta
  Clarify semantics of c->v4 and c->v6 variables
  Separate IPv4 and IPv6 configuration
  Make substructures for IPv4 and IPv6 specific context information

 arp.c                 |   2 +-
 conf.c                | 326 ++++++++++++++++++++++--------------------
 dhcp.c                |  22 +--
 dhcpv6.c              |  18 +--
 ndp.c                 |  16 +--
 netlink.c             |  79 +---------
 netlink.h             |   2 +-
 passt.c               |   6 +-
 passt.h               |  78 +++++-----
 pasta.c               |  14 +-
 tap.c                 |  32 +++--
 tcp.c                 |  56 ++++----
 test/dhcp/passt       |   3 +-
 test/dhcp/pasta       |   3 +-
 test/ndp/passt        |   4 +-
 test/two_guests/basic |   3 +-
 udp.c                 |  70 ++++-----
 util.c                |   6 +-
 util.h                |   6 -
 19 files changed, 357 insertions(+), 389 deletions(-)

-- 
2.37.1