From: Vlad Yasevich <vyasevic@redhat.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Stephen Hemminger <stephen@networkplumber.org>,
bridge@lists.linux-foundation.org, davem@davemloft.net,
netdev@vger.kernel.org
Subject: Re: [PATCH v9 net-next 00/12] Add basic VLAN support to bridges
Date: Thu, 07 Feb 2013 17:48:00 -0500 [thread overview]
Message-ID: <51142F20.4050008@redhat.com> (raw)
In-Reply-To: <510FE8BE.4040302@redhat.com>
On 02/04/2013 11:58 AM, Vlad Yasevich wrote:
> On 02/04/2013 11:24 AM, Stephen Hemminger wrote:
>> One thing I am not clear about is whether is supposed to be just
>> a simple filter of VLAN traffic, or a full VLAN aware bridge.
>
> I started with the concept of basic VLAN filtering, but it has been
> morphing into more of a VLAN away bridge.
>
>>
>> The change to make FDB entries per-VLAN seems to be the biggest tipping
>> point into a full VLAN bridge. I am concerned that might break existing
>> API's and Spanning Tree (internal and external).
>>
>
> I debated for a while about whether per-VLAN FDB entries were needed.
> The typing point was that without it, you may end up with flopping FDB
> and possible packet drops or vlan leaks, if say 2 different VMs used the
> same MAC but different VLANs. Without it, there is an exploitable gap.
>
> I've also tried to separate FDB code changes as much as possible. If
> you really thing this is a big risk and a barrier to entry, then we can
> drop them. I am just concerned about the hole I described above, but I
> guess it is not much different then what's there now.
>
So I played with STP for quite a bit and found the FDB changes have
absolutely no effect on operation of STP.
Since all the vlan filtering code is mostly in forwarding path, STP
works just fine.
Looking at STP code (the one in the kernel), I don't see any
dependencies on FDB. The only userspace code I can find is from here
git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/rstp.git. That
only seems to ask for RTM_GETLINK, and there you will not get any vlan
information if you don't set the filter flags.
So, I don't see any API impact as far as STP is concerned.
-vlad
next prev parent reply other threads:[~2013-02-07 22:48 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-01 20:01 [PATCH v9 net-next 00/12] Add basic VLAN support to bridges Vlad Yasevich
2013-02-01 20:01 ` [PATCH v9 net-next 01/12] bridge: Add vlan filtering infrastructure Vlad Yasevich
2013-02-02 1:04 ` Michał Mirosław
2013-02-02 2:11 ` Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 02/12] bridge: Validate that vlan is permitted on ingress Vlad Yasevich
2013-02-02 1:04 ` Michał Mirosław
2013-02-02 2:13 ` Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 03/12] bridge: Verify that a vlan is allowed to egress on give port Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 04/12] bridge: Add netlink interface to configure vlans on bridge ports Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 05/12] bridge: Add the ability to configure pvid Vlad Yasevich
2013-02-02 1:04 ` Michał Mirosław
2013-02-02 1:15 ` Michał Mirosław
2013-02-02 2:22 ` Vlad Yasevich
2013-02-03 14:49 ` Michał Mirosław
2013-02-03 15:20 ` Michał Mirosław
2013-02-04 16:59 ` Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 06/12] bridge: Implement vlan ingress/egress policy Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 07/12] bridge: Add vlan to unicast fdb entries Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 08/12] bridge: Add vlan id to multicast groups Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 09/12] bridge: Add vlan support to static neighbors Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 10/12] bridge: Add vlan support for local fdb entries Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 11/12] bridge: Dump vlan information from a bridge port Vlad Yasevich
2013-02-01 20:02 ` [PATCH v9 net-next 12/12] bridge: Separate egress policy bitmap Vlad Yasevich
2013-02-04 16:24 ` [PATCH v9 net-next 00/12] Add basic VLAN support to bridges Stephen Hemminger
2013-02-04 16:58 ` Vlad Yasevich
2013-02-07 22:48 ` Vlad Yasevich [this message]
2013-02-07 22:57 ` Stephen Hemminger
2013-02-07 23:00 ` Vlad Yasevich
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