Notification about tentative IPv6 address from route socket

[Guy Yur]

Hi,

------ Original Message ------
From: "Alexander V. Chernikov" <melifaro at freebsd.org>
To: "Steffen Christgau" <mail at s14u.de>; "freebsd-net at freebsd.org" 
<freebsd-net at freebsd.org>
Sent: 2020-05-03 11:42:07
Subject: Re: Notification about tentative IPv6 address from route socket

>30.04.2020, 17:40, "Steffen Christgau" <mail at s14u.de>:
>>  Hi everybody,
>Hi Steffen,
>>
>>...
>>
>>  1) Is there a way to get notified about the address being available for
>>  usage (i.e. not tentative anymore, not duplicated) without _polling_ via
>Not that I'm aware of :-(
>>...
>>
>>  2) I know FreeBSD is not Linux, but on Linux with netlink sockets I get
>>  notified about a) the address appearing (including flags) and b) some
>>  time later the address being not tentative anymore (detectable via
>>  flags). I wonder why the route socket on FreeBSD reports an address that
>>  is currently hardly to use. On the other hand, I understand that
>>  RTM_NEWADDR does exactly what is documented, i.e. to notify about an
>>  "address being added to iface". Nevertheless, wouldn't it make sense to
>>  tell an application that a change for an address takes place? I couldn't
>>  observe such a behavior for IPv6 on FreeBSD. If there is currently no
>>  really such notification, the kernel could emit a new message like
>>  RTM_ADDRCHANGE or it may repeats the emission of RTM_NEWADDR (which
>It makes total sense. I have plans to update some rtsock internals and will take a look at this one.
>Thank you for your suggestion!

There is a phabricator differential written by Roy Marples that does 
this:
https://reviews.freebsd.org/D5469

Regards,
Guy

>
>>  ...
>>
>>  Regards, Steffen
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