netdev - Re: [PATCH 6/17 net-2.6.26] [NETNS]: Default arp parameters lookup.

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Message-Id: <1203413980.27296.9.camel@iris.sw.ru>
Date:	Tue, 19 Feb 2008 12:39:40 +0300
From:	"Denis V. Lunev" <den@...nvz.org>
To:	Daniel Lezcano <dlezcano@...ibm.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	containers@...ts.osdl.org, devel@...nvz.org
Subject: Re: [PATCH 6/17 net-2.6.26] [NETNS]: Default arp parameters lookup.

On Tue, 2008-02-19 at 10:14 +0100, Daniel Lezcano wrote:
> Denis V. Lunev wrote:
> > Default ARP parameters should be findable regardless of the context.
> > Required to make inetdev_event working.
> > 
> > Signed-off-by: Denis V. Lunev <den@...nvz.org>
> > ---
> >  net/core/neighbour.c |    4 +---
> >  1 files changed, 1 insertions(+), 3 deletions(-)
> > 
> > diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> > index c895ad4..45ed620 100644
> > --- a/net/core/neighbour.c
> > +++ b/net/core/neighbour.c
> > @@ -1275,9 +1275,7 @@ static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl,
> >  	struct neigh_parms *p;
> > 
> >  	for (p = &tbl->parms; p; p = p->next) {
> > -		if (p->net != net)
> > -			continue;
> > -		if ((p->dev && p->dev->ifindex == ifindex) ||
> > +		if ((p->dev && p->dev->ifindex == ifindex && p->net == net) ||
> >  		    (!p->dev && !ifindex))
> >  			return p;
> >  	}
> 
> If the values are:
> 	p->dev == NULL
> 	ifindex == 0
> 	p->net != net
> 
> The parms should not be taken into account and the looping must 
> continue. But with this modification it is not the case, if we specify 
> parms ifindex == 0, the first parms with the dev field set to NULL will 
> be taken belonging or not to the right net.

They should be taken. In the other case inetdev_event will fail for sure
in the middle. You could check.

These are ARP defaults and I do not see a problem for now to get them.

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