netdev - Re: [PATCH/RFC net-next] openvswitch: allow output of MPLS packets on tunnel vports

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CALnjE+q+N1nQdRpsdrYSyON3Sv2qRdvyFz4JELu4a0sJs=h6uw@mail.gmail.com>
Date:	Tue, 16 Jun 2015 12:54:08 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Simon Horman <simon.horman@...ronome.com>
Cc:	netdev <netdev@...r.kernel.org>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [PATCH/RFC net-next] openvswitch: allow output of MPLS packets on
 tunnel vports

On Mon, Jun 15, 2015 at 5:39 PM, Simon Horman
<simon.horman@...ronome.com> wrote:
> Currently output of MPLS packets on tunnel vports is not allowed by the
> datapath and, moreover, flows that match on MPLS packets and output to
> tunnel vports are rejected by the datapath. The flows are rejected
> regardless of if they also output to non-tunnel vports which is allowed for
> MPLS packets and the following is logged by the kernel.
>
> openvswitch: netlink: Flow actions may not be safe on all matching packets.
>
> This patch addresses the above by allowing output of MPLS packets to tunnel
> vports.
>
> My recollection of adding MPLS support to the datapath was that a rather
> conservative approach was taken in order to minimise the chance of fallout.
> This patch proposes relaxing one restriction which was introduced at that
> time.
>
> My limited testing has not isolated any side effects of this change.
>
> Signed-off-by: Simon Horman <simon.horman@...ronome.com>
> ---
>  net/openvswitch/flow_netlink.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index 624e41c4267f..a5d3c0ae8ac8 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> @@ -1847,9 +1847,6 @@ static int validate_set(const struct nlattr *a,
>                 break;
>
>         case OVS_KEY_ATTR_TUNNEL:
> -               if (eth_p_mpls(eth_type))
> -                       return -EINVAL;
> -
One of the problem is with setting skb->inner_protocol. MPLS and
tunnel both needs to set inner protocol field. So outer encapsulation
would just overwrite earlier inner protocol field on packet transit
path.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html