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 Addresses eligible for DHCP assignments are marked with an DHCP flag. o Addresses eligible for DHCPv6 advertisement are marked with an DHCPV6 flag. o Addresses eligible for NDP advertisement are marked with an NDP flag. 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. v6: - Skipped late binding commit for now. - Added commit for using a single print buffer in conf_print - Added commit for reading and adding all addresses from template interface. - Added commit for refactoring pasta_ns_conf(). - Added separate address flags for DHCP, DHCPv6, and NDP, so that those are easy to recognize for their respective functions. - Split DHCP and DHCPv6 address selection into separate commits. - Updated migration protocol to v3 for multi-address support. - Numerous other smaller changes, both after feedback from David G. and issues I have identified myself. Jon Maloy (13): conf: use a single buffer for print formatting in conf_print() ip: Introduce unified multi-address data structures fwd: Unify guest accessibility checks with unified address array arp: Check all configured addresses in ARP filtering conf: Allow multiple -a/--address options per address family netlink, conf: Read all addresses from template interface at startup ip: refactor function pasta_ns_conf() ip: Track observed guest IPv4 addresses in unified address array ip: Track observed guest IPv6 addresses in unified address array migrate: Update protocol to v3 for multi-address support dhcp: Select address for DHCP distribution dhcpv6: Select addresses for DHCPv6 distribution ndp: Support advertising multiple prefixes in Router Advertisements arp.c | 17 +++- conf.c | 225 ++++++++++++++++++++++------------------ dhcp.c | 28 +++-- dhcp.h | 2 +- dhcpv6.c | 120 +++++++++++++--------- dhcpv6.h | 2 +- fwd.c | 300 ++++++++++++++++++++++++++++++++++++++++-------------- fwd.h | 8 ++ igmp.c | 1 + inany.h | 13 +++ ip.h | 2 + migrate.c | 239 +++++++++++++++++++++++++++++++++++++++++-- ndp.c | 129 ++++++++++++++++------- netlink.c | 66 ++++++------ netlink.h | 5 +- passt.h | 93 ++++++++++++++--- pasta.c | 227 +++++++++++++++++++++-------------------- tap.c | 75 ++++++++++---- 18 files changed, 1093 insertions(+), 459 deletions(-) -- 2.52.0