[PATCH v5 00/13] Introduce multiple addresses and late binding

[Jon Maloy <jmaloy@redhat.com>]

This series adds handling of multiple addresses into a unified address
array, so that a guest can see the same addresses on his own interface.

o All addresses are stored as union inany_addr
o User configured addresses are marked with a USER flag.
o Host provided addresses are marked with a HOST flag.
o Link local addresses are also marked with a LINKLOCAL flag.
o Addresses the guest is actually using are marked with an OBSERVED flag.
o The address selected for IPv4 DHCP offers is marked with a DHCP flag.

We also include a commit to support late binding of interfaces,
addresses, and routes.

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 be in IPv6/IpV4 mapped format
  - Updated migration protocol to v3, handling multiple addresses
  - Many other smaller changes, based on feedback from the PASST team   

v4:
  - Numerous changes based on feedback
  - Added several new commits, mostly broken
    out of the pre-existing ones.

v5: - Re-introduced multiple OBSERVED addresses. This actually
      turned out to be cleaner and with more predictable behaviour
      than allowing only one.
    - Included the DHCP and NDP patches from previous versions,
      improved and updated according to feedback from the team.
    - Likewise re-included the host-side netlink commit to support
      late binding.

Jon Maloy (13):
  ip: Introduce unified multi-address data structures
  ip: Introduce for_each_addr() macro for address iteration
  fwd: Unify guest accessibility checks with unified address array
  arp: Check all configured addresses in ARP filtering
  netlink: Return prefix length for IPv6 addresses in nl_addr_get()
  conf: Allow multiple -a/--address options per address family
  ip: Track observed guest IPv4 addresses in unified address array
  ip: Track observed guest IPv6 addresses in unified address array
  migrate: Rename v1 address functions to v2 for clarity
  migrate: Update protocol to v3 for multi-address support
  dhcp, dhcpv6: Select addresses for DHCP distribution
  ndp: Support advertising multiple prefixes in Router Advertisement
  netlink: Add host-side monitoring for late template interface binding

 arp.c        |  15 +-
 conf.c       | 200 +++++++++++++++----------
 conf.h       |   9 ++
 dhcp.c       |  30 ++--
 dhcp.h       |   2 +-
 dhcpv6.c     |  78 +++++++---
 dhcpv6.h     |   2 +-
 epoll_type.h |   2 +
 fwd.c        | 263 +++++++++++++++++++++++++--------
 fwd.h        |   9 ++
 inany.h      |   3 +
 ip.h         |   5 +
 isolation.c  |   5 +
 migrate.c    | 183 ++++++++++++++++++++---
 ndp.c        | 134 ++++++++++++-----
 netlink.c    | 401 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 netlink.h    |   3 +
 passt.c      |   5 +
 passt.h      | 104 +++++++++++--
 pasta.c      |  39 +++--
 tap.c        |  67 ++++++---
 21 files changed, 1282 insertions(+), 277 deletions(-)

-- 
2.52.0