Re: IPv6 locking crash (recursion)

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To: net@FreeBSD.org
Date: Mon, 29 Dec 2003 12:24:19 -0500

Brian Fundakowski Feldman <green@FreeBSD.org> wrote:
> Has anyone else tried out the most basic IPv6 test: ndp -I <iface> and
> then ping6 fe80::<normal address without %<iface> extension>? I was
> greeted by recursion on a non-recursive lock. After some sleuthing,
> I tried to determine what conditions could be tested for that would
> indicate "this must not call the nd6_is_addr_neighbor() call because
> we're from a normal RTM_RESOLVE initializing a new route", and this
> is the most correct thing I can come up with. It actually would do
> something entirely different if recursion were allowed. Comments?
>
> Index: nd6.c
> ===================================================================
> RCS file: /u/FreeBSD-cvs/src/sys/netinet6/nd6.c,v
> retrieving revision 1.37
> diff -u -r1.37 nd6.c
> --- nd6.c 8 Nov 2003 23:36:32 -0000 1.37
> +++ nd6.c 26 Nov 2003 13:45:45 -0000
> @@ -1095,7 +1095,8 @@
>
> if (req == RTM_RESOLVE &&
> (nd6_need_cache(ifp) == 0 || /* stf case */
> - !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp))) {
> + ((!(rt->rt_flags & RTF_WASCLONED) || rt->rt_flags & RTF_LLINFO) &&
> + !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp)))) {
> /*
> * FreeBSD and BSD/OS often make a cloned host route based
> * on a less-specific route (e.g. the default route).

Does anyone know anything about this yet?? I get the crash using completely
legitimate methods, trying to receive packets that are directed explicitly to
ff02::1%wi0 via interface wi0, unless I enable this workaround.

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\
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