netdev - Re: [PATCH] net: ipv6: check net in ip6_call_ra

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Date:   Thu, 28 Feb 2019 16:09:17 -0800
From:   Francesco Ruggeri <fruggeri@...sta.com>
To:     David Ahern <dsahern@...il.com>
Cc:     David Miller <davem@...emloft.net>, yoshfuji@...ux-ipv6.org,
        kuznet@....inr.ac.ru, Maxim Martynov <maxim@...sta.com>,
        linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: ipv6: check net in ip6_call_ra_chain

On Thu, Feb 28, 2019 at 3:31 PM David Ahern <dsahern@...il.com> wrote:
>
> On 2/28/19 2:02 PM, David Miller wrote:
> > From: fruggeri@...sta.com (Francesco Ruggeri)
> > Date: Thu, 28 Feb 2019 11:01:46 -0800
> >
> >> ip6_call_ra_chain is called when IPv6 packet with Router Alert option
> >> is forwarded.
> >> It needs to check if the net of the socket is the same as the net of the
> >> input device, otherwise the packet gets delivered to every IPv6 socket
> >> listening for Router Alerts, no matter which network namespace it is in.
> >>
> >> Suggested-by: Maxim Martynov <maxim@...sta.com>
> >> Signed-off-by: Maxim Martynov <maxim@...sta.com>
> >> Signed-off-by: Francesco Ruggeri <fruggeri@...sta.com>
> >
> > Right now someone using such a tool does get all RAs in the system.
> >
> > Your change not only breaks them, but also gives them no method by
> > which to keep obtaining the same behavior.
> >
> > I don't know what to do or suggest in this situation, but right now
> > I'm putting this patch on hold.
> >
>
> need an equivalent to NETLINK_LISTEN_ALL_NSID

If that would be acceptable, we can look into it.

Thanks,
Francesco