Allow user space to use a temporary random MAC address for a Management frame exchange with drivers that indicate support for this. The main use for this is to allow GAS/ANQP exchanges to be performed before a connection without having to expose a persistent MAC address similarly to the way active scanning can be done with a random MAC address. Signed-off-by: Jouni Malinen <jouni@xxxxxxxxxxxxxx> --- net/mac80211/ieee80211_i.h | 3 +++ net/mac80211/offchannel.c | 9 +++++++++ net/mac80211/rx.c | 5 +++++ 3 files changed, 17 insertions(+) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 9407cf44305c..d58f9acc90a3 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -1251,6 +1251,9 @@ struct ieee80211_local { struct timer_list sta_cleanup; int sta_generation; + /* temporary random address for a Management frame exchange */ + u8 mgmt_tx_rand_addr[ETH_ALEN]; + struct sk_buff_head pending[IEEE80211_MAX_QUEUES]; struct tasklet_struct tx_pending_tasklet; struct tasklet_struct wake_txqs_tasklet; diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c index db3b8bf75656..afdfced696ec 100644 --- a/net/mac80211/offchannel.c +++ b/net/mac80211/offchannel.c @@ -955,6 +955,12 @@ int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev, IEEE80211_SKB_CB(skb)->hw_queue = local->hw.offchannel_tx_hw_queue; + /* remember a random MAC address for Management frame exchange */ + if (wiphy_ext_feature_isset(wiphy, + NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA) && + !ether_addr_equal(mgmt->sa, wdev_address(wdev))) + memcpy(local->mgmt_tx_rand_addr, mgmt->sa, ETH_ALEN); + /* This will handle all kinds of coalescing and immediate TX */ ret = ieee80211_start_roc_work(local, sdata, params->chan, params->wait, cookie, skb, @@ -971,6 +977,9 @@ int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy, { struct ieee80211_local *local = wiphy_priv(wiphy); + /* stop using the random MAC address for Management frame exchange */ + eth_zero_addr(local->mgmt_tx_rand_addr); + return ieee80211_cancel_roc(local, cookie, true); } diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index eaf8931e4627..60dc2406171f 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -3898,6 +3898,7 @@ EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) { struct ieee80211_sub_if_data *sdata = rx->sdata; + struct ieee80211_local *local = sdata->local; struct sk_buff *skb = rx->skb; struct ieee80211_hdr *hdr = (void *)skb->data; struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); @@ -3912,6 +3913,10 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) return false; if (multicast) return true; + if (is_valid_ether_addr(local->mgmt_tx_rand_addr) && + ether_addr_equal(local->mgmt_tx_rand_addr, hdr->addr1)) + return true; + return ether_addr_equal(sdata->vif.addr, hdr->addr1); case NL80211_IFTYPE_ADHOC: if (!bssid) -- 2.20.1