https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293228
Bug ID: 293228
Summary: jail(8): In-use IPs from can be removed from host
interfaces
Product: Base System
Version: 15.0-CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
When shutting down a non-vnet jail, jail(8) currently reads the jail's IP
address from a jail configuration file and calls ifconfig to remove the IP from
the host interface.
This breaks other non-vnet jails also using the same IP at the time.
This PR modifies jail(8) so it looks at all running jails before deciding to
remove an IP address from a host interface.
It also has some helper functions to deal with the fact that the kernel returns
an address in the format `em0|192.168.0.1/32` while jail(8) only has a bare IP
from a jail configuration file
(and FWIW, currently jail(8) does not detach interface addresses _at all_ if
not passed a configuration file)
https://github.com/freebsd/freebsd-src/pull/2000
Tracking more state in the kernel would probably be better long-term, but for
now this eliminates unexpected behavior.
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