The jail(8) man page has an entry under 'allow.*', allow.socket_af,
states to allow access to protocol stacks that have not had jail
added to them.
Is this sysctl missing, or is it not a tunable?
The sysctls that describe available jail parameters don't always have a
type that sysctl(8) understands. In particular, the boolean parameters
are given a sysctl type of "B", and sysctl(8) will ignore them.
These aren't useful sysctls in any normal way - they never have a
meaningful value. The exist only so their types and sizes can be
determined by jail(8) and jail(3).
As per the jail(8) man page, you can use "sysctl -d" to show sysctl
descriptions without the value. Since it's only the values that
sysctl(8) doesn't understand, such parameters as allow.sock_af will then
Or, in a short answer to your last question: this isn't a tunable in the
normal sysctl way, just a jail parameter.
Thanks for the explanation. Would there be opposition about a patch for
jail(8) noting which sysctls are tunable by sysctl(8) and which are not?