netdev - Re: [PATCH net] ipv6: use rt6_info members when dst is set in rt6_fill

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Date:   Tue, 11 Sep 2018 11:41:06 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>,
        davem <davem@...emloft.net>,
        Roopa Prabhu <roopa@...ulusnetworks.com>
Subject: Re: [PATCH net] ipv6: use rt6_info members when dst is set in
 rt6_fill_node

Hi David,
On Mon, Sep 10, 2018 at 08:39:34PM -0600, David Ahern wrote:
> On 9/10/18 7:04 PM, Hangbin Liu wrote:
> 
> > diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> > index 18e00ce..62621b4 100644
> > --- a/net/ipv6/route.c
> > +++ b/net/ipv6/route.c
> > @@ -998,6 +998,21 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
> >  	rt->rt6i_prefsrc = ort->fib6_prefsrc;
> >  }
> >  
> > +static void rt6_update_info(struct rt6_info *rt)
> > +{
> > +	struct fib6_info *from;
> > +
> > +	rcu_read_lock();
> > +	from = rcu_dereference(rt->from);
> > +	fib6_info_hold(from);
> > +	rcu_read_unlock();
> > +
> > +	from->fib6_flags = rt->rt6i_flags;
> > +	from->fib6_nh.nh_gw = rt->rt6i_gateway;
> 
> As I mentioned on your last patch, redirects do *not* update fib
> entries. Exceptions, yes, but not core data of a fib entry.

Thanks for the comments, I understand that we should not update original route.
And here I know the redirect (should?) do not update fib entries.

So Xin Long's patch looks more reasonable.

Thanks
Hangbin