Kevin Bowling b5519c4493 hyperv: Configure IPv6 when setting up VF failover ...

The default VF-up script moves IPv4 configuration from the synthetic
interface to a failover lagg, but leaves IPv6 unconfigured on the lagg.
Adding the synthetic interface as a member can remove its IPv6 addresses,
so deleting the remaining member addresses is not sufficient.

Stop accepting router advertisements on the synthetic interface before
adding it to the lagg.  Leave its link-local address and IPv6 enable state
in place for lagg's address, prefix and default-router cleanup, then disable
IPv6 and explicitly remove any remaining addresses.  This also covers
members without a link-local address or with IPv6 already disabled.

Replay the synthetic interface's IPv6 rc.conf configuration on the lagg,
including aliases, prefix-derived addresses and legacy configuration names.
Remap the variables in a subshell and reuse network.subr's IPv6 helpers.
For SLAAC, solicit fresh router advertisements rather than copying learned
addresses as permanent ones.  Configure IPv6 independently of the IPv4
DHCP/static choice, and leave existing laggs alone on repeated invocation.
Custom DHCPv6 clients and interface-scoped static routes still require the
per-interface setup hook.

Fixes: c685956956 ("hyperv: Add VF bringup scripts and devd rules.")
MFC after:	2 weeks
Sponsored by:	BBOX.io

2026-09-14 19:03:24 -07:00

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hyperv: Configure IPv6 when setting up VF failover

2026-09-14 19:03:24 -07:00