Re: 2.4.21+ - IPv6 over IPv4 tunneling b0rked

From: Pekka Savola (pekkas@netcore.fi)
Date: Fri Jul 11 2003 - 05:59:14 EST

On Fri, 11 Jul 2003, YOSHIFUJI Hideaki / [iso-2022-jp] $B5HF#1QL@(B wrote:
> In article <Pine.LNX.4.44.0307111347090.27351-100000@netcore.fi> (at Fri, 11 Jul 2003 13:47:48 +0300 (EEST)), Pekka Savola <pekkas@netcore.fi> says:
>
> > On Fri, 11 Jul 2003, YOSHIFUJI Hideaki / [iso-2022-jp] $B5HF#1QL@(B wrote:
> > > In article <Pine.LNX.4.44.0307111301520.27036-100000@netcore.fi> (at Fri, 11 Jul 2003 13:03:54 +0300 (EEST)), Pekka Savola <pekkas@netcore.fi> says:
> > >
> > > > > We have but we cannot; it is refcnt'ed.
> > > >
> > > > I don't understand what you mean. Refcnt'ed by a userland process, so
> > > > that if you'd want the subnet-router anycast address, the whole time a
> > > > process (like radvd) should be running.. or what?
> > >
> > > Kernel has refcnt for subnet router anycast address.
> > > Ref/dereference from userspace is done via socket.
> > > You cannot derefer subnet router anycast address
> > > from userspace if the socket hasn't refered it.
> >
> > So? The point is that subnet router anycast address *could* be referenced
> > explicitly by a user-land socket (e.g. by radvd), not kernel at all.
>
> So, you cannot remove subnet router anycast address from
> kernel via this interface; kernel keeps one reference.

.. which is why kernel shouldn't keep *any* reference *at all*!
 
> (Hmm, I may misunderstand your mail...)

.. seems like it.. 

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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