brcmfmac: add wowl gtk rekeying offload support

This patch adds support for gtk rekeying offload and for gtk
rekeying failure during wowl mode.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

@@ -3526,6 +3526,10 @@ static void brcmf_report_wowl_wakeind(struct wiphy *wiphy, struct brcmf_if *ifp)
 			else
 				wakeup_data.net_detect = cfg->wowl.nd_info;
 		}
+		if (wakeind & BRCMF_WOWL_GTK_FAILURE) {
+			brcmf_dbg(INFO, "WOWL Wake indicator: BRCMF_WOWL_GTK_FAILURE\n");
+			wakeup_data.gtk_rekey_failure = true;
+		}
 	} else {
 		wakeup = NULL;
 	}
@@ -3607,6 +3611,8 @@ static void brcmf_configure_wowl(struct brcmf_cfg80211_info *cfg,
 		brcmf_fweh_register(cfg->pub, BRCMF_E_PFN_NET_FOUND,
 				    brcmf_wowl_nd_results);
 	}
+	if (wowl->gtk_rekey_failure)
+		wowl_config |= BRCMF_WOWL_GTK_FAILURE;
 	if (!test_bit(BRCMF_VIF_STATUS_CONNECTED, &ifp->vif->sme_state))
 		wowl_config |= BRCMF_WOWL_UNASSOC;
 
@@ -4874,7 +4880,32 @@ static int brcmf_cfg80211_tdls_oper(struct wiphy *wiphy,
 	return ret;
 }
 
-static struct cfg80211_ops wl_cfg80211_ops = {
+#ifdef CONFIG_PM
+static int
+brcmf_cfg80211_set_rekey_data(struct wiphy *wiphy, struct net_device *ndev,
+			      struct cfg80211_gtk_rekey_data *gtk)
+{
+	struct brcmf_if *ifp = netdev_priv(ndev);
+	struct brcmf_gtk_keyinfo_le gtk_le;
+	int ret;
+
+	brcmf_dbg(TRACE, "Enter, bssidx=%d\n", ifp->bsscfgidx);
+
+	memcpy(gtk_le.kck, gtk->kck, sizeof(gtk_le.kck));
+	memcpy(gtk_le.kek, gtk->kek, sizeof(gtk_le.kek));
+	memcpy(gtk_le.replay_counter, gtk->replay_ctr,
+	       sizeof(gtk_le.replay_counter));
+
+	ret = brcmf_fil_iovar_data_set(ifp, "gtk_key_info", &gtk_le,
+				       sizeof(gtk_le));
+	if (ret < 0)
+		brcmf_err("gtk_key_info iovar failed: ret=%d\n", ret);
+
+	return ret;
+}
+#endif
+
+static struct cfg80211_ops brcmf_cfg80211_ops = {
 	.add_virtual_intf = brcmf_cfg80211_add_iface,
 	.del_virtual_intf = brcmf_cfg80211_del_iface,
 	.change_virtual_intf = brcmf_cfg80211_change_iface,
@@ -6139,19 +6170,18 @@ static void brcmf_wiphy_wowl_params(struct wiphy *wiphy, struct brcmf_if *ifp)
 {
 #ifdef CONFIG_PM
 	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
-	s32 err;
-	u32 wowl_cap;
 
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_PNO)) {
-		err = brcmf_fil_iovar_int_get(ifp, "wowl_cap", &wowl_cap);
+		if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_ND)) {
-		if (!err) {
+			brcmf_wowlan_support.flags |= WIPHY_WOWLAN_NET_DETECT;
-			if (wowl_cap & BRCMF_WOWL_PFN_FOUND) {
-				brcmf_wowlan_support.flags |=
-							WIPHY_WOWLAN_NET_DETECT;
 			init_waitqueue_head(&cfg->wowl.nd_data_wait);
 		}
 	}
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_GTK)) {
+		brcmf_wowlan_support.flags |= WIPHY_WOWLAN_SUPPORTS_GTK_REKEY;
+		brcmf_wowlan_support.flags |= WIPHY_WOWLAN_GTK_REKEY_FAILURE;
 	}
+
 	wiphy->wowlan = &brcmf_wowlan_support;
 #endif
 }
@@ -6538,6 +6568,7 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
 	struct net_device *ndev = brcmf_get_ifp(drvr, 0)->ndev;
 	struct brcmf_cfg80211_info *cfg;
 	struct wiphy *wiphy;
+	struct cfg80211_ops *ops;
 	struct brcmf_cfg80211_vif *vif;
 	struct brcmf_if *ifp;
 	s32 err = 0;
@@ -6549,8 +6580,17 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
 		return NULL;
 	}
 
+	ops = kzalloc(sizeof(*ops), GFP_KERNEL);
+	if (!ops)
+		return NULL;
+
+	memcpy(ops, &brcmf_cfg80211_ops, sizeof(*ops));
 	ifp = netdev_priv(ndev);
-	wiphy = wiphy_new(&wl_cfg80211_ops, sizeof(struct brcmf_cfg80211_info));
+#ifdef CONFIG_PM
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_GTK))
+		ops->set_rekey_data = brcmf_cfg80211_set_rekey_data;
+#endif
+	wiphy = wiphy_new(ops, sizeof(struct brcmf_cfg80211_info));
 	if (!wiphy) {
 		brcmf_err("Could not allocate wiphy device\n");
 		return NULL;
@@ -6560,6 +6600,7 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
 
 	cfg = wiphy_priv(wiphy);
 	cfg->wiphy = wiphy;
+	cfg->ops = ops;
 	cfg->pub = drvr;
 	init_vif_event(&cfg->vif_event);
 	INIT_LIST_HEAD(&cfg->vif_list);
@@ -6686,6 +6727,7 @@ priv_out:
 	ifp->vif = NULL;
 wiphy_out:
 	brcmf_free_wiphy(wiphy);
+	kfree(ops);
 	return NULL;
 }
 
@@ -6696,6 +6738,7 @@ void brcmf_cfg80211_detach(struct brcmf_cfg80211_info *cfg)
 
 	brcmf_btcoex_detach(cfg);
 	wiphy_unregister(cfg->wiphy);
+	kfree(cfg->ops);
 	wl_deinit_priv(cfg);
 	brcmf_free_wiphy(cfg->wiphy);
 }

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h

@@ -256,6 +256,7 @@ struct brcmf_cfg80211_wowl {
  * struct brcmf_cfg80211_info - dongle private data of cfg80211 interface
  *
  * @wiphy: wiphy object for cfg80211 interface.
+ * @ops: pointer to copy of ops as registered with wiphy object.
  * @conf: dongle configuration.
  * @p2p: peer-to-peer specific information.
  * @btcoex: Bluetooth coexistence information.
@@ -288,6 +289,7 @@ struct brcmf_cfg80211_wowl {
  */
 struct brcmf_cfg80211_info {
 	struct wiphy *wiphy;
+	struct cfg80211_ops *ops;
 	struct brcmf_cfg80211_conf *conf;
 	struct brcmf_p2p_info p2p;
 	struct brcmf_btcoex_info *btcoex;

drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c

@@ -136,6 +136,7 @@ void brcmf_feat_attach(struct brcmf_pub *drvr)
 {
 	struct brcmf_if *ifp = brcmf_get_ifp(drvr, 0);
 	struct brcmf_pno_macaddr_le pfn_mac;
+	u32 wowl_cap;
 	s32 err;
 
 	brcmf_feat_firmware_capabilities(ifp);
@@ -143,6 +144,17 @@ void brcmf_feat_attach(struct brcmf_pub *drvr)
 	brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_PNO, "pfn");
 	if (drvr->bus_if->wowl_supported)
 		brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_WOWL, "wowl");
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL)) {
+		err = brcmf_fil_iovar_int_get(ifp, "wowl_cap", &wowl_cap);
+		if (!err) {
+			if (wowl_cap & BRCMF_WOWL_PFN_FOUND)
+				ifp->drvr->feat_flags |=
+					BIT(BRCMF_FEAT_WOWL_ND);
+			if (wowl_cap & BRCMF_WOWL_GTK_FAILURE)
+				ifp->drvr->feat_flags |=
+					BIT(BRCMF_FEAT_WOWL_GTK);
+		}
+	}
 	/* MBSS does not work for 43362 */
 	if (drvr->bus_if->chip == BRCM_CC_43362_CHIP_ID)
 		ifp->drvr->feat_flags &= ~BIT(BRCMF_FEAT_MBSS);

drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.h

@@ -27,6 +27,8 @@
  * RSDB: Real Simultaneous Dual Band
  * TDLS: Tunneled Direct Link Setup
  * SCAN_RANDOM_MAC: Random MAC during (net detect) scheduled scan.
+ * WOWL_ND: WOWL net detect (PNO)
+ * WOWL_GTK: (WOWL) GTK rekeying offload
  */
 #define BRCMF_FEAT_LIST \
 	BRCMF_FEAT_DEF(MBSS) \
@@ -36,7 +38,9 @@
 	BRCMF_FEAT_DEF(P2P) \
 	BRCMF_FEAT_DEF(RSDB) \
 	BRCMF_FEAT_DEF(TDLS) \
-	BRCMF_FEAT_DEF(SCAN_RANDOM_MAC)
+	BRCMF_FEAT_DEF(SCAN_RANDOM_MAC) \
+	BRCMF_FEAT_DEF(WOWL_ND) \
+	BRCMF_FEAT_DEF(WOWL_GTK)
 
 /*
  * Quirks:

drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h

@@ -111,7 +111,9 @@
 /* Wakeup if received matched secured pattern: */
 #define BRCMF_WOWL_SECURE		(1 << 25)
 /* Wakeup on finding preferred network */
-#define BRCMF_WOWL_PFN_FOUND		(1 << 26)
+#define BRCMF_WOWL_PFN_FOUND		(1 << 27)
+/* Wakeup on receiving pairwise key EAP packets: */
+#define WIPHY_WOWL_EAP_PK		(1 << 28)
 /* Link Down indication in WoWL mode: */
 #define BRCMF_WOWL_LINKDOWN		(1 << 31)
 
@@ -136,6 +138,10 @@
 
 #define BRCMF_MCSSET_LEN		16
 
+#define BRCMF_RSN_KCK_LENGTH		16
+#define BRCMF_RSN_KEK_LENGTH		16
+#define BRCMF_RSN_REPLAY_LEN		8
+
 /* join preference types for join_pref iovar */
 enum brcmf_join_pref_types {
 	BRCMF_JOIN_PREF_RSSI = 1,
@@ -789,4 +795,17 @@ struct brcmf_pktcnt_le {
 	__le32 rx_ocast_good_pkt;
 };
 
+/**
+ * struct brcmf_gtk_keyinfo_le - GTP rekey data
+ *
+ * @kck: key confirmation key.
+ * @kek: key encryption key.
+ * @replay_counter: replay counter.
+ */
+struct brcmf_gtk_keyinfo_le {
+	u8 kck[BRCMF_RSN_KCK_LENGTH];
+	u8 kek[BRCMF_RSN_KEK_LENGTH];
+	u8 replay_counter[BRCMF_RSN_REPLAY_LEN];
+};
+
 #endif /* FWIL_TYPES_H_ */