Messages in this thread | | | Date | Fri, 19 Aug 2022 11:51:11 +0200 | From | netdev@kapio-te ... | Subject | Re: [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry flag to drivers |
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On 2022-08-14 16:55, Ido Schimmel wrote: > On Fri, Aug 12, 2022 at 02:29:48PM +0200, netdev@kapio-technology.com > wrote: >> On 2022-08-11 13:28, Ido Schimmel wrote: >> >> > > > I'm talking about roaming, not forwarding. Let's say you have a locked >> > > > entry with MAC X pointing to port Y. Now you get a packet with SMAC X >> > > > from port Z which is unlocked. Will the FDB entry roam to port Z? I >> > > > think it should, but at least in current implementation it seems that >> > > > the "locked" flag will not be reset and having locked entries pointing >> > > > to an unlocked port looks like a bug.
I have made the locked entries sticky in the bridge, so that they don't move to other ports.
>> > > > >> > > >> >> In general I have been thinking that the said setup is a network >> configuration error as I was arguing in an earlier conversation with >> Vladimir. In this setup we must remember that SMAC X becomes DMAC X in >> the >> return traffic on the open port. But the question arises to me why MAC >> X >> would be behind the locked port without getting authed while being >> behind an >> open port too? >> In a real life setup, I don't think you would want random hosts behind >> a >> locked port in the MAB case, but only the hosts you will let through. >> Other >> hosts should be regarded as intruders. >> >> If we are talking about a station move, then the locked entry will age >> out >> and MAC X will function normally on the open port after the timeout, >> which >> was a case that was taken up in earlier discussions. >> >> But I will anyhow do some testing with this 'edge case' (of being >> behind >> both a locked and an unlocked port) if I may call it so, and see to >> that the >> offloaded and non-offloaded cases correspond to each other, and will >> work >> satisfactory. > > It would be best to implement these as additional test cases in the > current selftest. Then you can easily test with both veth pairs and > loopbacks and see that the hardware and software data paths behave the > same. >
How many loops would be needed to have a selftest with a HUB and a MAC on both a locked and an unlocked port?
>> >> I think it will be good to have a flag to enable the mac-auth/MAB >> feature, >> and I suggest just calling the flag 'mab', as it is short.
I have now created the flag to enable Mac-Auth/MAB with iproute2: bridge link set dev DEV macauth on|off
with the example output from 'bridge -d link show dev DEV' when macauth is enabled: 1: ethX: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br0 state forwarding priority 32 cost 19 hairpin off guard off root_block off fastleave off learning on flood off mcast_flood on bcast_flood on mcast_router 1 mcast_to_unicast off neigh_suppress off vlan_tunnel off isolated off locked mab on
The flag itself in the code is called BR_PORT_MACAUTH.
> > Fine by me, but I'm not sure everyone agrees.
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