wifi: rtw89: wow: construct EAPoL packet for GTK rekey offload

We construct EAPoL packet with various encryption method, and download
to firmware. Also we add Key Encryption Key (KEK) and Key Confirmation Key
(KCK) to H2C command. Once firmware received EAPoL group rekey packet(1/2)
can TX EAPoL group rekey packet(2/2) when suspend.
Signed-off-by: Chih-Kang Chang <gary.chang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240502022505.28966-8-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.c

@@ -4511,7 +4511,8 @@ static int rtw89_core_register_hw(struct rtw89_dev *rtwdev)
 
 	hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS |
 			    WIPHY_FLAG_TDLS_EXTERNAL_SETUP |
-			    WIPHY_FLAG_AP_UAPSD;
+			    WIPHY_FLAG_AP_UAPSD |
+			    WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK;
 
 	if (!chip->support_rnr)
 		hw->wiphy->flags |= WIPHY_FLAG_SPLIT_SCAN_6GHZ;

drivers/net/wireless/realtek/rtw89/core.h

@@ -5215,11 +5215,24 @@ struct rtw89_wow_key_info {
 	u8 gtk_rx_iv[4][8];
 } __packed;
 
+struct rtw89_wow_gtk_info {
+	u8 kck[32];
+	u8 kek[32];
+	u8 tk1[16];
+	u8 txmickey[8];
+	u8 rxmickey[8];
+	__le32 igtk_keyid;
+	__le64 ipn;
+	u8 igtk[2][32];
+	u8 psk[32];
+} __packed;
+
 struct rtw89_wow_param {
 	struct ieee80211_vif *wow_vif;
 	DECLARE_BITMAP(flags, RTW89_WOW_FLAG_NUM);
 	struct rtw89_wow_cam_info patterns[RTW89_MAX_PATTERN_NUM];
 	struct rtw89_wow_key_info key_info;
+	struct rtw89_wow_gtk_info gtk_info;
 	u8 pattern_cnt;
 	u8 ptk_alg;
 	u8 gtk_alg;

drivers/net/wireless/realtek/rtw89/fw.c

@@ -13,6 +13,13 @@
 #include "reg.h"
 #include "util.h"
 
+struct rtw89_eapol_2_of_2 {
+	struct ieee80211_hdr_3addr hdr;
+	u8 gtkbody[14];
+	u8 key_des_ver;
+	u8 rsvd[92];
+} __packed __aligned(2);
+
 static const u8 mss_signature[] = {0x4D, 0x53, 0x53, 0x4B, 0x50, 0x4F, 0x4F, 0x4C};
 
 union rtw89_fw_element_arg {
@@ -2147,6 +2154,44 @@ int rtw89_fw_h2c_fw_log(struct rtw89_dev *rtwdev, bool enable)
 	return ret;
 }
 
+static struct sk_buff *rtw89_eapol_get(struct rtw89_dev *rtwdev,
+				       struct rtw89_vif *rtwvif)
+{
+	static const u8 gtkbody[] = {0xAA, 0xAA, 0x03, 0x00, 0x00, 0x00, 0x88,
+				     0x8E, 0x01, 0x03, 0x00, 0x5F, 0x02, 0x03};
+	struct ieee80211_vif *vif = rtwvif_to_vif(rtwvif);
+	struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
+	struct rtw89_wow_param *rtw_wow = &rtwdev->wow;
+	struct rtw89_eapol_2_of_2 *eapol_pkt;
+	struct sk_buff *skb;
+	u8 key_des_ver;
+
+	if (rtw_wow->ptk_alg == 3)
+		key_des_ver = 1;
+	else if (rtw_wow->akm == 1 || rtw_wow->akm == 2)
+		key_des_ver = 2;
+	else if (rtw_wow->akm > 2 && rtw_wow->akm < 7)
+		key_des_ver = 3;
+	else
+		key_des_ver = 0;
+
+	skb = dev_alloc_skb(sizeof(*eapol_pkt));
+	if (!skb)
+		return NULL;
+
+	eapol_pkt = skb_put_zero(skb, sizeof(*eapol_pkt));
+	eapol_pkt->hdr.frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
+						   IEEE80211_FCTL_TODS |
+						   IEEE80211_FCTL_PROTECTED);
+	ether_addr_copy(eapol_pkt->hdr.addr1, bss_conf->bssid);
+	ether_addr_copy(eapol_pkt->hdr.addr2, vif->addr);
+	ether_addr_copy(eapol_pkt->hdr.addr3, bss_conf->bssid);
+	memcpy(eapol_pkt->gtkbody, gtkbody, sizeof(gtkbody));
+	eapol_pkt->key_des_ver = key_des_ver;
+
+	return skb;
+}
+
 static int rtw89_fw_h2c_add_general_pkt(struct rtw89_dev *rtwdev,
 					struct rtw89_vif *rtwvif,
 					enum rtw89_fw_pkt_ofld_type type,
@@ -2174,6 +2219,9 @@ static int rtw89_fw_h2c_add_general_pkt(struct rtw89_dev *rtwdev,
 	case RTW89_PKT_OFLD_TYPE_QOS_NULL:
 		skb = ieee80211_nullfunc_get(rtwdev->hw, vif, -1, true);
 		break;
+	case RTW89_PKT_OFLD_TYPE_EAPOL_KEY:
+		skb = rtw89_eapol_get(rtwdev, rtwvif);
+		break;
 	default:
 		goto err;
 	}
@@ -6493,6 +6541,71 @@ int rtw89_fw_wow_cam_update(struct rtw89_dev *rtwdev,
 	return ret;
 }
 
+int rtw89_fw_h2c_wow_gtk_ofld(struct rtw89_dev *rtwdev,
+			      struct rtw89_vif *rtwvif,
+			      bool enable)
+{
+	struct rtw89_wow_param *rtw_wow = &rtwdev->wow;
+	struct rtw89_wow_gtk_info *gtk_info = &rtw_wow->gtk_info;
+	struct rtw89_h2c_wow_gtk_ofld *h2c;
+	u8 macid = rtwvif->mac_id;
+	u32 len = sizeof(*h2c);
+	struct sk_buff *skb;
+	u8 pkt_id_eapol = 0;
+	int ret;
+
+	if (!rtw_wow->gtk_alg)
+		return 0;
+
+	skb = rtw89_fw_h2c_alloc_skb_with_hdr(rtwdev, len);
+	if (!skb) {
+		rtw89_err(rtwdev, "failed to alloc skb for gtk ofld\n");
+		return -ENOMEM;
+	}
+
+	skb_put(skb, len);
+	h2c = (struct rtw89_h2c_wow_gtk_ofld *)skb->data;
+
+	if (!enable) {
+		skb_put_zero(skb, sizeof(*gtk_info));
+		goto hdr;
+	}
+
+	ret = rtw89_fw_h2c_add_general_pkt(rtwdev, rtwvif,
+					   RTW89_PKT_OFLD_TYPE_EAPOL_KEY,
+					   &pkt_id_eapol);
+	if (ret)
+		goto fail;
+
+	/* not support TKIP and IEEE80211W yet */
+	h2c->w0 = le32_encode_bits(enable, RTW89_H2C_WOW_GTK_OFLD_W0_EN) |
+		  le32_encode_bits(0, RTW89_H2C_WOW_GTK_OFLD_W0_TKIP_EN) |
+		  le32_encode_bits(0, RTW89_H2C_WOW_GTK_OFLD_W0_IEEE80211W_EN) |
+		  le32_encode_bits(macid, RTW89_H2C_WOW_GTK_OFLD_W0_MAC_ID) |
+		  le32_encode_bits(pkt_id_eapol, RTW89_H2C_WOW_GTK_OFLD_W0_GTK_RSP_ID);
+	h2c->w1 = le32_encode_bits(rtw_wow->akm, RTW89_H2C_WOW_GTK_OFLD_W1_ALGO_AKM_SUIT);
+	h2c->gtk_info = rtw_wow->gtk_info;
+
+hdr:
+	rtw89_h2c_pkt_set_hdr(rtwdev, skb, FWCMD_TYPE_H2C,
+			      H2C_CAT_MAC,
+			      H2C_CL_MAC_WOW,
+			      H2C_FUNC_GTK_OFLD, 0, 1,
+			      len);
+
+	ret = rtw89_h2c_tx(rtwdev, skb, false);
+	if (ret) {
+		rtw89_err(rtwdev, "failed to send h2c\n");
+		goto fail;
+	}
+	return 0;
+
+fail:
+	dev_kfree_skb_any(skb);
+
+	return ret;
+}
+
 /* Return < 0, if failures happen during waiting for the condition.
  * Return 0, when waiting for the condition succeeds.
  * Return > 0, if the wait is considered unreachable due to driver/FW design,

drivers/net/wireless/realtek/rtw89/fw.h

@@ -1979,6 +1979,23 @@ static inline void RTW89_SET_WOW_CAM_UPD_VALID(void *h2c, u32 val)
 	le32p_replace_bits((__le32 *)h2c + 5, val, BIT(31));
 }
 
+struct rtw89_h2c_wow_gtk_ofld {
+	__le32 w0;
+	__le32 w1;
+	struct rtw89_wow_gtk_info gtk_info;
+} __packed;
+
+#define RTW89_H2C_WOW_GTK_OFLD_W0_EN BIT(0)
+#define RTW89_H2C_WOW_GTK_OFLD_W0_TKIP_EN BIT(1)
+#define RTW89_H2C_WOW_GTK_OFLD_W0_IEEE80211W_EN BIT(2)
+#define RTW89_H2C_WOW_GTK_OFLD_W0_PAIRWISE_WAKEUP BIT(3)
+#define RTW89_H2C_WOW_GTK_OFLD_W0_NOREKEY_WAKEUP BIT(4)
+#define RTW89_H2C_WOW_GTK_OFLD_W0_MAC_ID GENMASK(23, 16)
+#define RTW89_H2C_WOW_GTK_OFLD_W0_GTK_RSP_ID GENMASK(31, 24)
+#define RTW89_H2C_WOW_GTK_OFLD_W1_PMF_SA_QUERY_ID GENMASK(7, 0)
+#define RTW89_H2C_WOW_GTK_OFLD_W1_PMF_BIP_SEC_ALGO GENMASK(9, 8)
+#define RTW89_H2C_WOW_GTK_OFLD_W1_ALGO_AKM_SUIT GENMASK(17, 10)
+
 enum rtw89_btc_btf_h2c_class {
 	BTFC_SET = 0x10,
 	BTFC_GET = 0x11,
@@ -3843,6 +3860,7 @@ struct rtw89_fw_h2c_rf_reg_info {
 #define H2C_FUNC_KEEP_ALIVE		0x0
 #define H2C_FUNC_DISCONNECT_DETECT	0x1
 #define H2C_FUNC_WOW_GLOBAL		0x2
+#define H2C_FUNC_GTK_OFLD		0x3
 #define H2C_FUNC_WAKEUP_CTRL		0x8
 #define H2C_FUNC_WOW_CAM_UPD		0xC
 
@@ -4361,6 +4379,9 @@ int rtw89_fw_h2c_wow_wakeup_ctrl(struct rtw89_dev *rtwdev,
 				 struct rtw89_vif *rtwvif, bool enable);
 int rtw89_fw_wow_cam_update(struct rtw89_dev *rtwdev,
 			    struct rtw89_wow_cam_info *cam_info);
+int rtw89_fw_h2c_wow_gtk_ofld(struct rtw89_dev *rtwdev,
+			      struct rtw89_vif *rtwvif,
+			      bool enable);
 int rtw89_fw_h2c_add_mcc(struct rtw89_dev *rtwdev,
 			 const struct rtw89_fw_mcc_add_req *p);
 int rtw89_fw_h2c_start_mcc(struct rtw89_dev *rtwdev,

drivers/net/wireless/realtek/rtw89/mac80211.c

@@ -1106,6 +1106,28 @@ static void rtw89_ops_set_wakeup(struct ieee80211_hw *hw, bool enabled)
 
 	device_set_wakeup_enable(rtwdev->dev, enabled);
 }
+
+static void rtw89_set_rekey_data(struct ieee80211_hw *hw,
+				 struct ieee80211_vif *vif,
+				 struct cfg80211_gtk_rekey_data *data)
+{
+	struct rtw89_dev *rtwdev = hw->priv;
+	struct rtw89_wow_param *rtw_wow = &rtwdev->wow;
+	struct rtw89_wow_gtk_info *gtk_info = &rtw_wow->gtk_info;
+
+	if (data->kek_len > sizeof(gtk_info->kek) ||
+	    data->kck_len > sizeof(gtk_info->kck)) {
+		rtw89_warn(rtwdev, "kek or kck length over fw limit\n");
+		return;
+	}
+
+	mutex_lock(&rtwdev->mutex);
+
+	memcpy(gtk_info->kek, data->kek, data->kek_len);
+	memcpy(gtk_info->kck, data->kck, data->kck_len);
+
+	mutex_unlock(&rtwdev->mutex);
+}
 #endif
 
 const struct ieee80211_ops rtw89_ops = {
@@ -1151,6 +1173,7 @@ const struct ieee80211_ops rtw89_ops = {
 	.suspend		= rtw89_ops_suspend,
 	.resume			= rtw89_ops_resume,
 	.set_wakeup		= rtw89_ops_set_wakeup,
+	.set_rekey_data		= rtw89_set_rekey_data,
 #endif
 };
 EXPORT_SYMBOL(rtw89_ops);