ath11k: support MAC address randomization in scan

The driver reports NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR capability
to upper layer based on the service bit firmware reported. Driver
sets the spoofed flag in scan_ctrl_flag to firmware if upper layer
has enabled this feature in scan request.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Signed-off-by: Carl Huang <quic_cjhuang@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1638948007-9609-1-git-send-email-quic_cjhuang@quicinc.com

drivers/net/wireless/ath/ath11k/mac.c

@@ -3543,6 +3543,12 @@ static int ath11k_mac_op_hw_scan(struct ieee80211_hw *hw,
 			arg.chan_list[i] = req->channels[i]->center_freq;
 	}
 
+	if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
+		arg.scan_f_add_spoofed_mac_in_probe = 1;
+		ether_addr_copy(arg.mac_addr.addr, req->mac_addr);
+		ether_addr_copy(arg.mac_mask.addr, req->mac_addr_mask);
+	}
+
 	ret = ath11k_start_scan(ar, &arg);
 	if (ret) {
 		ath11k_warn(ar->ab, "failed to start hw scan: %d\n", ret);
@@ -5587,6 +5593,14 @@ static int ath11k_mac_op_start(struct ieee80211_hw *hw)
 		goto err;
 	}
 
+	if (test_bit(WMI_TLV_SERVICE_SPOOF_MAC_SUPPORT, ar->wmi->wmi_ab->svc_map)) {
+		ret = ath11k_wmi_scan_prob_req_oui(ar, ar->mac_addr);
+		if (ret) {
+			ath11k_err(ab, "failed to set prob req oui: %i\n", ret);
+			goto err;
+		}
+	}
+
 	ret = ath11k_wmi_pdev_set_param(ar, WMI_PDEV_PARAM_ARP_AC_OVERRIDE,
 					0, pdev->pdev_id);
 	if (ret) {
@@ -8183,6 +8197,11 @@ static int __ath11k_mac_register(struct ath11k *ar)
 
 	ar->hw->wiphy->max_ap_assoc_sta = ar->max_num_stations;
 
+	if (test_bit(WMI_TLV_SERVICE_SPOOF_MAC_SUPPORT, ar->wmi->wmi_ab->svc_map)) {
+		ar->hw->wiphy->features |=
+			NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR;
+	}
+
 	ar->hw->queues = ATH11K_HW_MAX_QUEUES;
 	ar->hw->wiphy->tx_queue_len = ATH11K_QUEUE_LEN;
 	ar->hw->offchannel_tx_hw_queue = ATH11K_HW_MAX_QUEUES - 1;

drivers/net/wireless/ath/ath11k/wmi.c

@@ -2181,6 +2181,8 @@ int ath11k_wmi_send_scan_start_cmd(struct ath11k *ar,
 	cmd->num_ssids = params->num_ssids;
 	cmd->ie_len = params->extraie.len;
 	cmd->n_probes = params->n_probes;
+	ether_addr_copy(cmd->mac_addr.addr, params->mac_addr.addr);
+	ether_addr_copy(cmd->mac_mask.addr, params->mac_mask.addr);
 
 	ptr += sizeof(*cmd);
 
@@ -7710,3 +7712,31 @@ int ath11k_wmi_wow_enable(struct ath11k *ar)
 
 	return ath11k_wmi_cmd_send(ar->wmi, skb, WMI_WOW_ENABLE_CMDID);
 }
+
+int ath11k_wmi_scan_prob_req_oui(struct ath11k *ar,
+				 const u8 mac_addr[ETH_ALEN])
+{
+	struct sk_buff *skb;
+	struct wmi_scan_prob_req_oui_cmd *cmd;
+	u32 prob_req_oui;
+	int len;
+
+	prob_req_oui = (((u32)mac_addr[0]) << 16) |
+		       (((u32)mac_addr[1]) << 8) | mac_addr[2];
+
+	len = sizeof(*cmd);
+	skb = ath11k_wmi_alloc_skb(ar->wmi->wmi_ab, len);
+	if (!skb)
+		return -ENOMEM;
+
+	cmd = (struct wmi_scan_prob_req_oui_cmd *)skb->data;
+	cmd->tlv_header = FIELD_PREP(WMI_TLV_TAG,
+				     WMI_TAG_SCAN_PROB_REQ_OUI_CMD) |
+			  FIELD_PREP(WMI_TLV_LEN, sizeof(*cmd) - TLV_HDR_SIZE);
+	cmd->prob_req_oui = prob_req_oui;
+
+	ath11k_dbg(ar->ab, ATH11K_DBG_WMI, "wmi scan prob req oui %d\n",
+		   prob_req_oui);
+
+	return ath11k_wmi_cmd_send(ar->wmi, skb, WMI_SCAN_PROB_REQ_OUI_CMDID);
+}

drivers/net/wireless/ath/ath11k/wmi.h

@@ -3313,6 +3313,8 @@ struct scan_req_params {
 	u32 num_hint_bssid;
 	struct hint_short_ssid hint_s_ssid[WLAN_SCAN_MAX_HINT_S_SSID];
 	struct hint_bssid hint_bssid[WLAN_SCAN_MAX_HINT_BSSID];
+	struct wmi_mac_addr mac_addr;
+	struct wmi_mac_addr mac_mask;
 };
 
 struct wmi_ssid_arg {
@@ -3676,6 +3678,11 @@ struct wmi_scan_chan_list_cmd {
 	u32 pdev_id;
 } __packed;
 
+struct wmi_scan_prob_req_oui_cmd {
+	u32 tlv_header;
+	u32 prob_req_oui;
+}  __packed;
+
 #define WMI_MGMT_SEND_DOWNLD_LEN	64
 
 #define WMI_TX_PARAMS_DWORD0_POWER		GENMASK(7, 0)
@@ -5530,5 +5537,6 @@ int ath11k_wmi_set_hw_mode(struct ath11k_base *ab,
 			   enum wmi_host_hw_mode_config_type mode);
 int ath11k_wmi_wow_host_wakeup_ind(struct ath11k *ar);
 int ath11k_wmi_wow_enable(struct ath11k *ar);
-
+int ath11k_wmi_scan_prob_req_oui(struct ath11k *ar,
+				 const u8 mac_addr[ETH_ALEN]);
 #endif