On 8/4/16, 1:15 AM, Toshiaki Makita wrote: > On 2016/08/04 16:24, Roopa Prabhu wrote: >> On 8/3/16, 7:11 PM, Toshiaki Makita wrote: >>> Adding fdb entries pointing to the bridge device uses fdb_insert(), >>> which lacks various checks and does not respect added_by_user flag. >>> >>> As a result, some inconsistent behavior can happen: >>> * Adding temporary entries succeeds but results in permanent entries. >> IIRC this is not specific to fdb entries on the bridge device. all temp >> fdb entries via iproute2 result in permanent entries. thats why 'dynamic' >> was added. > Sorry for confusing you, I meant "temp" (i.e., "static") of bridge fdb > command. > "temp", "dynamic" and "use" should not result in "permanent". > >>> * Same goes for "dynamic" and "use". >> This patch seems to not allow dynamic and use entries >> on the bridge device. I don't see a strong use-case to >> allow them, but any reason you want to add the restriction now ? > Because dynamic fdb entries pointing the bridge device cannot be > created. So it is prohibited. I cannot find other appropriate behavior > about this. > Or are you suggesting local entries with aging supported or something > like that? no, i am ok with prohibiting it, just was wondering if this is necessary. > >>> * Changing mac address of the bridge device causes deletion of >>> user-added entries. >> unless I am missing something, this does not seem to be related to the >> external fdb entry on the bridge device. > Yes this is related to manually-added fdb entries on the bridge device. > When manual addition of fdb pointing the bridge device was introduced, > we should have set added_by_user on adding the entry and modify > br_fdb_change_mac_address() to respect the flag, but both were not done. > >>> * Replacing existing entries looks successful from userspace but actually >>> not, regardless of NLM_F_EXCL flag. >> curious about this one. I will try it, but if you have an example that >> will help. > Before: > # bridge fdb add 12:34:56:78:90:ab dev enp3s0 master > # bridge fdb add 12:34:56:78:90:ab dev br0; echo $? > 0 > # bridge fdb show > ... > 12:34:56:78:90:ab dev enp3s0 master br0 permanent > > # bridge fdb replace 12:34:56:78:90:ab dev br0; echo $? > 0 > # bridge fdb show > ... > 12:34:56:78:90:ab dev enp3s0 master br0 permanent > > After: > # bridge fdb add 12:34:56:78:90:ab dev enp3s0 master > # bridge fdb add 12:34:56:78:90:ab dev br0; echo $? > RTNETLINK answers: File exists > 255 > > # bridge fdb replace 12:34:56:78:90:ab dev br0; echo $? > 0 > # bridge fdb show > ... > 12:34:56:78:90:ab dev br0 master br0 permanent > ok, thanks for the example. Acked-by: Roopa Prabhu <roopa@xxxxxxxxxxxxxxxxxxx>
