iwmc3200wifi: Implement cfg80211 PMKSA API

We need to implement the PMKSA API for proper WPA2 pre-auth and fast
re-association. Our fullmac device generates all (re-)assoc IEs, and thus it
needs the right PMKIDs. With this implementation we now get them from
wpa_supplicant.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwmc3200wifi/cfg80211.c

@@ -725,6 +725,33 @@ static int iwm_cfg80211_set_power_mgmt(struct wiphy *wiphy,
 				       CFG_POWER_INDEX, iwm->conf.power_index);
 }
 
+int iwm_cfg80211_set_pmksa(struct wiphy *wiphy, struct net_device *netdev,
+			   struct cfg80211_pmksa *pmksa)
+{
+	struct iwm_priv *iwm = wiphy_to_iwm(wiphy);
+
+	return iwm_send_pmkid_update(iwm, pmksa, IWM_CMD_PMKID_ADD);
+}
+
+int iwm_cfg80211_del_pmksa(struct wiphy *wiphy, struct net_device *netdev,
+			   struct cfg80211_pmksa *pmksa)
+{
+	struct iwm_priv *iwm = wiphy_to_iwm(wiphy);
+
+	return iwm_send_pmkid_update(iwm, pmksa, IWM_CMD_PMKID_DEL);
+}
+
+int iwm_cfg80211_flush_pmksa(struct wiphy *wiphy, struct net_device *netdev)
+{
+	struct iwm_priv *iwm = wiphy_to_iwm(wiphy);
+	struct cfg80211_pmksa pmksa;
+
+	memset(&pmksa, 0, sizeof(struct cfg80211_pmksa));
+
+	return iwm_send_pmkid_update(iwm, &pmksa, IWM_CMD_PMKID_FLUSH);
+}
+
+
 static struct cfg80211_ops iwm_cfg80211_ops = {
 	.change_virtual_intf = iwm_cfg80211_change_iface,
 	.add_key = iwm_cfg80211_add_key,
@@ -741,6 +768,9 @@ static struct cfg80211_ops iwm_cfg80211_ops = {
 	.set_tx_power = iwm_cfg80211_set_txpower,
 	.get_tx_power = iwm_cfg80211_get_txpower,
 	.set_power_mgmt = iwm_cfg80211_set_power_mgmt,
+	.set_pmksa = iwm_cfg80211_set_pmksa,
+	.del_pmksa = iwm_cfg80211_del_pmksa,
+	.flush_pmksa = iwm_cfg80211_flush_pmksa,
 };
 
 static const u32 cipher_suites[] = {
@@ -786,6 +816,7 @@ struct wireless_dev *iwm_wdev_alloc(int sizeof_bus, struct device *dev)
 
 	set_wiphy_dev(wdev->wiphy, dev);
 	wdev->wiphy->max_scan_ssids = UMAC_WIFI_IF_PROBE_OPTION_MAX;
+	wdev->wiphy->max_num_pmkids = UMAC_MAX_NUM_PMKIDS;
 	wdev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 				       BIT(NL80211_IFTYPE_ADHOC);
 	wdev->wiphy->bands[IEEE80211_BAND_2GHZ] = &iwm_band_2ghz;

drivers/net/wireless/iwmc3200wifi/commands.c

@@ -960,3 +960,25 @@ int iwm_send_umac_stop_resume_tx(struct iwm_priv *iwm,
 				 sizeof(struct iwm_umac_cmd_stop_resume_tx));
 
 }
+
+int iwm_send_pmkid_update(struct iwm_priv *iwm,
+			  struct cfg80211_pmksa *pmksa, u32 command)
+{
+	struct iwm_umac_pmkid_update update;
+	int ret;
+
+	memset(&update, 0, sizeof(struct iwm_umac_pmkid_update));
+
+	update.command = cpu_to_le32(command);
+	memcpy(&update.bssid, pmksa->bssid, ETH_ALEN);
+	memcpy(&update.pmkid, pmksa->pmkid, WLAN_PMKID_LEN);
+
+	ret = iwm_send_wifi_if_cmd(iwm, &update,
+				   sizeof(struct iwm_umac_pmkid_update), 0);
+	if (ret) {
+		IWM_ERR(iwm, "PMKID update command failed\n");
+		return ret;
+	}
+
+	return 0;
+}

drivers/net/wireless/iwmc3200wifi/commands.h

@@ -458,6 +458,17 @@ struct iwm_umac_cmd_stop_resume_tx {
 	u16 reserved;
 } __attribute__ ((packed));
 
+#define IWM_CMD_PMKID_ADD   1
+#define IWM_CMD_PMKID_DEL   2
+#define IWM_CMD_PMKID_FLUSH 3
+
+struct iwm_umac_pmkid_update {
+	__le32 command;
+	u8 bssid[ETH_ALEN];
+	__le16 reserved;
+	u8 pmkid[WLAN_PMKID_LEN];
+} __attribute__ ((packed));
+
 /* LMAC commands */
 int iwm_read_mac(struct iwm_priv *iwm, u8 *mac);
 int iwm_send_prio_table(struct iwm_priv *iwm);
@@ -488,6 +499,8 @@ int iwm_scan_ssids(struct iwm_priv *iwm, struct cfg80211_ssid *ssids,
 int iwm_scan_one_ssid(struct iwm_priv *iwm, u8 *ssid, int ssid_len);
 int iwm_send_umac_stop_resume_tx(struct iwm_priv *iwm,
 				 struct iwm_umac_notif_stop_resume_tx *ntf);
+int iwm_send_pmkid_update(struct iwm_priv *iwm,
+			  struct cfg80211_pmksa *pmksa, u32 command);
 
 /* UDMA commands */
 int iwm_target_reset(struct iwm_priv *iwm);

drivers/net/wireless/iwmc3200wifi/umac.h

@@ -298,6 +298,7 @@ struct iwm_udma_out_wifi_hdr {
 #define UMAC_WIFI_IF_CMD_GLOBAL_TX_KEY_ID                0x1B
 #define UMAC_WIFI_IF_CMD_SET_HOST_EXTENDED_IE            0x1C
 #define UMAC_WIFI_IF_CMD_GET_SUPPORTED_CHANNELS          0x1E
+#define UMAC_WIFI_IF_CMD_PMKID_UPDATE                    0x1F
 #define UMAC_WIFI_IF_CMD_TX_PWR_TRIGGER                  0x20
 
 /* UMAC WiFi interface ports */
@@ -771,6 +772,7 @@ struct iwm_umac_notif_stop_resume_tx {
 	__le16 stop_resume_tid_msk; /* tid bitmask */
 } __attribute__ ((packed));
 
+#define UMAC_MAX_NUM_PMKIDS 4
 
 /* WiFi interface wrapper header */
 struct iwm_umac_wifi_if {