Conn25 hands out dummy IP addresses for use in the connector flow from
limited address pools. When the addresses are no longer in use we expire
the corresponding entry from our table of address mappings and return
the addresses to their pools for reuse.
We currently expire addresses after the DNS TTL for the DNS response
that caused the mappings to be created.
Stop expiring mappings when there are active packet flows for the
addresses in the mappings.
Fixestailscale/corp#43180
Co-authored-by: Fran Bull <fran@tailscale.com>
Co-authored-by: Michael Ben-Ami <mzb@tailscale.com>
Signed-off-by: Fran Bull <fran@tailscale.com>
Signed-off-by: Michael Ben-Ami <mzb@tailscale.com>
We don't want addr assignments to be lost from the collection before
they can be returned to the IP pools, otherwise we will get orphan
addresses marked inUse in the pools that will never be returned.
Fixestailscale/corp#39975
Signed-off-by: Fran Bull <fran@tailscale.com>
When we use assigned addresses in response to a DNS request, extend the
expiry on the assignment.
Updates tailscale/corp#39975
Signed-off-by: Fran Bull <fran@tailscale.com>
Make it possible to remove the least recently used expired address
assignment from addrAssignments.
Before checking out a new address from the IP pools, return a handful of
expired addresses.
Updates tailscale/corp#39975
Signed-off-by: Fran Bull <fran@tailscale.com>
Fran BullandMichael Ben-Ami