netdev - Re: [PATCH net-next] net/ipv6: Do not allow route add with a device that is down

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Date:   Tue, 23 Jan 2018 21:24:49 -0800
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ido Schimmel <idosch@...lanox.com>
Subject: Re: [PATCH net-next] net/ipv6: Do not allow route add with a device
 that is down

On Tue, Jan 23, 2018 at 7:13 PM, David Ahern <dsahern@...il.com> wrote:
> IPv6 allows routes to be installed when the device is not up (admin up).
> Worse, it does not mark it as LINKDOWN. IPv4 does not allow it and really
> there is no reason for IPv6 to allow it, so check the flags and deny if
> device is admin down.
>
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  net/ipv6/route.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index f85da2f1e729..689670713744 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -2734,6 +2734,11 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
>         if (!dev)
>                 goto out;
>
> +       if (!(dev->flags & IFF_UP)) {
> +               NL_SET_ERR_MSG(extack, "Nexthop device is not up");
> +               goto out;
> +       }

looks like it will need a -ENETDOWN too ?



> +
>         if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
>                 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
>                         NL_SET_ERR_MSG(extack, "Invalid source address");
> --
> 2.11.0
>