Hi,
I've been poking around at how this flag is used and I noticed this
check in net/wireless/nl80211.c:
nl80211_check_scan_flags()
if (*flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
int err;
if (!(wiphy->features & randomness_flag) ||
(wdev && wdev->current_bss))
return -EOPNOTSUPP;
The above disallows the use of RANDOM_ADDR for scans while connected.
The nl80211.h uapi header seems to concur:
"@NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR: This device/driver supports
using a random MAC address during scan (if the device is unassociated);"
However, if I create a P2P Device (in addition to the default STA
device), the kernel happily lets me scan on the wdev while the STA
interface is connected.
sudo iw phy0 interface add p2p type __p2pdev
sudo iw wdev 0x2 p2p start
sudo iw wdev 0x2 scan randomize
So the immediate question I have is, should the RANDOM_ADDR flag indeed
be limited to unassociated STA interfaces? It would seem the hardware
is capable randomizing even when connected? Please educate me :)
Regards,
-Denis
