netdev - Re: [PATCH net] ipv6: no need to return rt->dst.error if it is not null entry.

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Date:   Mon, 24 Jul 2017 10:28:27 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        WANG Cong <xiyou.wangcong@...il.com>
Subject: Re: [PATCH net] ipv6: no need to return rt->dst.error if it is not
 null entry.

Hi Roopa,
On Sat, Jul 22, 2017 at 09:55:51PM -0700, Roopa Prabhu wrote:
> On Thu, Jul 20, 2017 at 7:51 AM, Hangbin Liu <liuhangbin@...il.com> wrote:
> > After commit 18c3a61c4264 ("net: ipv6: RTM_GETROUTE: return matched fib
> > result when requested"). When we get a prohibit ertry, we will return
> > -EACCES directly.
> >
> > Before:
> > + ip netns exec client ip -6 route get 2003::1
> > prohibit 2003::1 dev lo table unspec proto kernel src 2001::1 metric
> > 4294967295 error -13
> >
> > After:
> > + ip netns exec server ip -6 route get 2002::1
> > RTNETLINK answers: Network is unreachable

Sorry, I have a copy/paste error here, the return error should be

+ ip netns exec server ip -6 route get 2002::1
RTNETLINK answers: Permission denied

I fixed it in v2 patch, but forgot to add
#ifdef CONFIG_IPV6_MULTIPLE_TABLES before net->ipv6.ip6_prohibit_entry.

Since you acked this patch. I will post a v3 patch with fixed comment.

> >
> > Since we will check the ip6_null_entry later. There is not sense
> > to check the dst.error after get rt.
> >
> > Fixes: 18c3a61c4264 ("net: ipv6: RTM_GETROUTE: return matched fib...")
> > Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> > ---
> 
> Acked-by: Roopa Prabhu <roopa@...ulusnetworks.com>

Thanks
Hangbin