summaryrefslogtreecommitdiff
path: root/net/mac80211/main.c
diff options
context:
space:
mode:
authorJames Prestwood <prestwoj@gmail.com>2022-08-26 20:00:32 +0300
committerJohannes Berg <johannes.berg@intel.com>2022-09-03 18:01:04 +0300
commit3c06e91b40db6db48c4886b0292983f404d31958 (patch)
tree525d3fb82cd9a9a16b40ed6538a2badc29b4ad31 /net/mac80211/main.c
parenta36c421690b3e5dee38fc12abfcabda742f00064 (diff)
downloadlinux-3c06e91b40db6db48c4886b0292983f404d31958.tar.xz
wifi: mac80211: Support POWERED_ADDR_CHANGE feature
Adds support in mac80211 for NL80211_EXT_FEATURE_POWERED_ADDR_CHANGE. The motivation behind this functionality is to fix limitations of address randomization on frequencies which are disallowed in world roaming. The way things work now, if a client wants to randomize their address per-connection it must power down the device, change the MAC, and power back up. Here lies a problem since powering down the device may result in frequencies being disabled (until the regdom is set). If the desired BSS is on one such frequency the client is unable to connect once the phy is powered again. For mac80211 based devices changing the MAC while powered is possible but currently disallowed (-EBUSY). This patch adds some logic to allow a MAC change while powered by removing the interface, changing the MAC, and adding it again. mac80211 will advertise support for this feature so userspace can determine the best course of action e.g. disallow address randomization on certain frequencies if not supported. There are certain limitations put on this which simplify the logic: - No active connection - No offchannel work, including scanning. Signed-off-by: James Prestwood <prestwoj@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/main.c')
-rw-r--r--net/mac80211/main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 5b1c47ed0cc0..46f3eddc2388 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -699,6 +699,8 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_TX_STATUS);
wiphy_ext_feature_set(wiphy,
NL80211_EXT_FEATURE_SCAN_FREQ_KHZ);
+ wiphy_ext_feature_set(wiphy,
+ NL80211_EXT_FEATURE_POWERED_ADDR_CHANGE);
if (!ops->hw_scan) {
wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |