svn commit: r288301 - in head/sys: net netinet netinet6

[Bjoern A. Zeeb]

On Sun, 27 Sep 2015, Alexander V. Chernikov wrote:

> Author: melifaro
> Date: Sun Sep 27 05:29:34 2015
> New Revision: 288301
> URL: https://svnweb.freebsd.org/changeset/base/288301
>
> Log:
>  Eliminate nd6_nud_hint() and its TCP bindings.
>
>  Initially function was introduced in r53541 (KAME initial commit) to
>    "provide hints from upper layer protocols that indicate a connection
>    is making "forward progress"" (quote from RFC 2461 7.3.1 Reachability
>    Confirmation).
>  However, it was converted to do nothing (e.g. just return) in r122922
>    (tcp_hostcache implementation) back in 2003. Some defines were moved
>    to tcp_var.h in r169541. Then, it was broken (for non-corner cases)
>    by r186119 (L2<>L3 split) in 2008 (NULL ifp in nd6_lookup). So,
>    right now this code is broken and has no "real" base users.
>
>  Differential Revision:	https://reviews.freebsd.org/D3699

PR:	165692

It would be nice to have the feature back though it would be very
expensive locking wise if it'd remain a per-packet operation.

-- 
Bjoern A. Zeeb             "Come on. Learn, goddamn it.", WarGames, 1983