[Bug 245103] IPv6: update v6 temporary address lifetime according to rfc4941bis

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245103

--- Comment #12 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Loganaden Velvindron from comment #10)

There're other changes since draft-ietf-6man-rfc4941bis-07, see the diff [1].

A quick look at it, the constant `MAX_DESYNC_FACTOR` is also changed. It is
`0.4 * TEMP_PREFERRED_LIFETIME` and was `10 minutes`.

The computing of `DESYNC_FACTOR` also changed.

I think we should take all the changes into account.


1.
https://author-tools.ietf.org/iddiff?url1=draft-ietf-6man-rfc4941bis-07&url2=rfc8981&difftype=--html

(In reply to Marek Zarychta from comment #11)

> Perhaps Fernando's patch could be put on the review on Phabricator and proceeded further?

> [1] https://lists.freebsd.org/pipermail/freebsd-net/2020-April/055689.html

Sound good. Phabricator is a better place for the review ;)

As this is a behavior change, it can not catch up with 14.0 . And it should be
completed (at best effort) before it goes into current/15.

I can put it into my working queue ;)

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