Hi list,
I'm using an Intel based computer with a network card supported by the
rt61pci driver. This computer has a quite strange problem, sometimes it
cannot be connected from other computers in the same network, sometimes
it can. Today I have spent some time to debug this and it looks like the
problem is caused by the group rekeying (rt61pci_config_shared_key). I'm
using WPA2 with TKIP group key.
Here the problem. After first association everything works and it still
works after the first re-keying. After the second one the computer no
longer responds to pings (arp "who has" request gets no answer). Then,
after the next re-keying it works again (and so on). So basically only
the first, third, fifth and so on re-keing works. After adding some
debug information to the driver I think that the driver is doing the
right thing. In total two keys are marked as active and before the third
re-keying the oldest one is deleted via DISABLE_KEY.
I solved the problem by setting only the new key as valid by changing
if (crypto->cmd == SET_KEY)
reg |= mask;
to
if (crypto->cmd == SET_KEY)
reg = mask;
However, the hardware seems to be able to support up to four keys. Do
you have any idea why the card behaves wrongly? Kernel is 2.6.36.2, but
according to git there are no important changes on recent kernels for
this driver.
Best regards,
Joerg