[PATCH v3 00/11] Introduce multiple addresses

[Jon Maloy <jmaloy@redhat.com>]

This version contains what I perceive as the least controversial
parts of my previous RFC series. It basically makes address
handling behave like before, but now allowing multiple addresses
both at the host side and the guest side.

v2:
  - Added the earlier standalone CIDR commit to the head of the series.
  - Replaced the guest namespace interface subscriptions with just
    an address observation feature, so that it works with both PASTA
    and PASST.
  - Unified 'no_copy_addrs' and 'copy_addrs' code paths, as suggested
    by David G.
  - Multiple other changes, also based on feedback from David.
  - Removed the host interface subscription patches, -for now.
    I intend to re-add them once this series is applied.
  - Outstanding question: When do we add an IPv4 link local address
    to the guest? Only in local/opaque mode? Only when
    explicitly requested? Always?

v3:
  - Unified the IPv4 and IPv6 arrays into one array
  - Changed prefix_len to always eb in IPv6/IpV4 mapped format
  - Updated migration protocol to v3, handling multiple addresses
  - Many other smaller changes, based on feedback from the PASST team   

Jon Maloy (11):
  conf: Support CIDR notation for -a/--address option
  ip: Add IN4_MASK() macro for IPv4 netmask calculation
  ip: Introduce unified multi-address data structures
  fwd: Check all configured addresses in guest accessibility functions
  arp: Check all configured addresses in ARP filtering
  pasta: Extract pasta_ns_conf_ip4/6() to reduce nesting
  conf: Allow multiple -a/--address options per address family
  migrate: Rename v1 address functions to v2 for clarity
  ip: Track observed guest IPv4 addresses in unified address array
  ip: Track observed guest IPv6 addresses in unified address array
  conf: Select addresses for DHCP and NDP distribution

 arp.c     |  17 ++--
 conf.c    | 249 ++++++++++++++++++++++++++++++++----------------------
 conf.h    |   6 ++
 dhcp.c    |  23 +++--
 dhcp.h    |   2 +-
 dhcpv6.c  |  23 +++--
 dhcpv6.h  |   2 +-
 fwd.c     | 216 ++++++++++++++++++++++++++++++++++++++--------
 fwd.h     |   6 ++
 inany.c   |  68 +++++++++++++++
 inany.h   |   1 +
 ip.c      |  22 +++++
 ip.h      |   9 ++
 migrate.c | 244 ++++++++++++++++++++++++++++++++++++++++++++++++----
 ndp.c     |  19 +++--
 ndp.h     |   4 +-
 passt.1   |  17 ++--
 passt.h   | 134 ++++++++++++++++++++++++++---
 pasta.c   | 197 ++++++++++++++++++++++++------------------
 tap.c     | 117 +++++++++++++++++++++----
 20 files changed, 1080 insertions(+), 296 deletions(-)

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2.52.0