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. v7: - Replaced commit #1 with one that fixes a return address issue with DHCPv6 - Modified for_each_addr() macro to take 4 arguments - Many more fixes and changes based on feedback and own findings. v8: - New commit replacing ctx->addr_fixed flag with CONF_ADDR_USER. - Moved migrate commit to last in series - Numerous smaller and larger fixes based on feedback from David Gibson and Stefano Brivio. Jon Maloy (14): dhcpv6: Fix reply destination to match client's source address passt, pasta: Introduce unified multi-address data structures tap, conf: Replace addr_fixed with CONF_ADDR_USER flag check 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 netlink, pasta: refactor function pasta_ns_conf() conf, pasta: Track observed guest IPv4 addresses in unified address array conf, pasta: Track observed guest IPv6 addresses in unified address array dhcp: Select address for DHCP distribution dhcpv6: Select addresses for DHCPv6 distribution ndp: Support advertising multiple prefixes in Router Advertisements migrate: Update protocol to v3 for multi-address support arp.c | 20 +++- conf.c | 201 ++++++++++++++++++++--------------- dhcp.c | 23 ++-- dhcpv6.c | 113 ++++++++++++-------- dhcpv6.h | 2 +- fwd.c | 312 ++++++++++++++++++++++++++++++++++++++++-------------- fwd.h | 7 +- inany.h | 32 ++++++ ip.h | 2 + migrate.c | 245 ++++++++++++++++++++++++++++++++++++++++-- ndp.c | 127 +++++++++++++++------- netlink.c | 99 +++++++++-------- netlink.h | 7 +- passt.1 | 5 +- passt.h | 81 +++++++++++--- pasta.c | 228 ++++++++++++++++++++------------------- tap.c | 40 ++----- tap.h | 2 - 18 files changed, 1063 insertions(+), 483 deletions(-) -- 2.52.0