netdev - Re: [PATCH net-next] mpls: Don't accept multipath configuration until the support is complete

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Date:	Mon, 2 Nov 2015 22:49:08 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Miller <davem@...emloft.net>
Cc:	rshearma@...cade.com, netdev@...r.kernel.org,
	Roopa Prabhu <roopa@...ulusnetworks.com>
Subject: Re: [PATCH net-next] mpls: Don't accept multipath configuration until
 the support is complete

Hello.

On 11/02/2015 10:29 PM, Eric W. Biederman wrote:

> Currently the multipath code has a nasty failure mode in that it will
> fail to notice link down or administrative device down and will
> instead black hole packets instead of sending them to their nexthop
> destination.
>
> Half the point of multipath is to gracefully handle forwarding path
> failures and as the current code does not handle forwarding failures the
> current code is dangerous to use.
>
> As mpls multipath has never been exported to userspace and as the
> implementation was not complete before the merge window disable the mpls
> multipath code by rejecting all multipath configuration requests.  This
> will give us another kernel development cycle to cleanly sort out the
> issues, without any bad precedents to worry about.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>   net/mpls/af_mpls.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
> index c70d750148b6..893cd2dc3979 100644
> --- a/net/mpls/af_mpls.c
> +++ b/net/mpls/af_mpls.c
> @@ -1162,6 +1162,8 @@ static int rtm_to_route_config(struct sk_buff *skb,  struct nlmsghdr *nlh,
>   		{
>   			cfg->rc_mp = nla_data(nla);
>   			cfg->rc_mp_len = nla_len(nla);
> +			/* Fail until multipath support is complete */
> +			goto errout;
>   			break;

    Forgot to delete *break*?

>   		}
>   		default:
>

MBR, Sergei

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