On Tue, Jan 15, 2019 at 02:01:29PM +0000, Bernd Edlinger wrote: > Apparently the rt2x61 firmware fails temporarily to decode > broadcast packets if the shared keys are not assigned > in the "correct" sequence. At the same time unicast > packets work fine, since they are encrypted with the > pairwise key. > > At least with WPA2 CCMP mode the shared keys are > set in the following sequence: keyidx=1, 2, 1, 2. > After a while only keyidx 2 gets decrypted, and > keyidx 1 is ignored, probably because there is never > a keyidx 3. > > Symptoms are arping -b works for 10 minutes, since > keyidx=2 is used for broadcast, and then it stops > working for 10 minutes, because keyidx=1 is used. > That failure mode repeats forever. > > Note, the firmware does not even know which keyidx > corresponds to which hw_key_idx so the firmware is > trying to be smarter than the driver, which is bound > to fail. > > As workaround the function rt61pci_config_shared_key > requests software decryption of the shared keys, > by returning EOPNOTSUPP. However, pairwise keys are > still handled by hardware which works just fine. > > Signed-off-by: Bernd Edlinger <bernd.edlinger@xxxxxxxxxx> Acked-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
