netdev - Re: [PATCH 1/1] neighbour : fix ndm

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Date:	Sat, 26 Jul 2014 23:05:14 +0800
From:	Jun Zhao <mypopydev@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Cong Wang <cwang@...pensource.com>,
	Pravin B Shelar <pshelar@...ira.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	stephen hemminger <stephen@...workplumber.org>,
	Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org,
	Francesco Fusco <ffusco@...hat.com>,
	Veaceslav Falico <vfalico@...hat.com>,
	Duan Jiong <duanj.fnst@...fujitsu.com>,
	Jiri Pirko <jiri@...nulli.us>,
	David Stevens <dlstevens@...ibm.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] neighbour : fix ndm_type type error issue

Hi, Hannes

On Sat, 2014-07-26 at 15:42 +0200, Hannes Frederic Sowa wrote:
> Hi,
> 
> On Sat, Jul 26, 2014, at 02:29, Jun Zhao wrote:
> > On Sat, 2014-07-26 at 01:24 +0200, Hannes Frederic Sowa wrote:
> > > On Fri, Jul 25, 2014, at 18:38, Jun Zhao wrote:
> > > > ndm_type means L3 address type, in neighbour proxy and vxlan, it's
> > > > RTN_UNICAST.
> > > > NDA_DST is for netlink TLV type, hence it's not right value in this
> > > > context.
> > > 
> > > The value of NDA_DST == RTN_UNICAST, otherwise we couldn't do this
> > > change as it would alter e.g. arpd behavior.
> > > 
> > > Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> > > 
> > > Thanks,
> > > Hannes
> > 
> > But I think NDA_DST/RTN_UNICAST have different means in this context, 
> > even though the value of NDA_DST == RTN_UNICAST.
> > 
> > For arp proxy/NDP proxy context, ndm_type means the peer L3 address,
> > so RTN_UNICAST is the right value. For vxlan have similar semantic for
> > remote ip.
> > 
> > BTW: In the source code, implicit think NDA_DST == RTN_UNICAST maybe
> > not a good idea when we don't have a comment or the other explain.
> 
> I am totally with you and think your change is good, that's why I also
> gave my ack to your patch.
> 
> My comment above was about my concerns regarding making a user space
> visible change, which in the end could alter the behavior of already
> existing software.
> 
> Developers maybe have debugged code and seen some different value being
> propagated from the kernel and this software could now break if we would
> change the value after all those years.
> 
> Bye,
> Hannes

Lucky， NDA_DST == RTN_UNICAST is true really in source code ：）

/* rtm_type */

enum {
	RTN_UNSPEC,
	RTN_UNICAST,		
...
}

enum {
	NDA_UNSPEC,
	NDA_DST,
...
}


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