Bluetooth: Add local SSP OOB data to OOB ext data mgmt command

The Read Local Out Of Band Extended Data mgmt command is specified to
return the SSP values when given a BR/EDR address type as input
parameter. The returned values may include either the 192-bit variants
of C and R, or their 256-bit variants, or both, depending on the status
of Secure Connections and Secure Connections Only modes. If SSP is not
enabled the command will only return the Class of Device value (like it
has done so far).
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/mgmt.c

@@ -6466,6 +6466,145 @@ static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type, u8 *data,
 	return eir_len;
 }
 
+static void read_local_oob_ext_data_complete(struct hci_dev *hdev, u8 status,
+					     u16 opcode, struct sk_buff *skb)
+{
+	const struct mgmt_cp_read_local_oob_ext_data *mgmt_cp;
+	struct mgmt_rp_read_local_oob_ext_data *mgmt_rp;
+	u8 *h192, *r192, *h256, *r256;
+	struct mgmt_pending_cmd *cmd;
+	u16 eir_len;
+	int err;
+
+	BT_DBG("%s status %u", hdev->name, status);
+
+	cmd = pending_find(MGMT_OP_READ_LOCAL_OOB_EXT_DATA, hdev);
+	if (!cmd)
+		return;
+
+	mgmt_cp = cmd->param;
+
+	if (status) {
+		status = mgmt_status(status);
+		eir_len = 0;
+
+		h192 = NULL;
+		r192 = NULL;
+		h256 = NULL;
+		r256 = NULL;
+	} else if (opcode == HCI_OP_READ_LOCAL_OOB_DATA) {
+		struct hci_rp_read_local_oob_data *rp;
+
+		if (skb->len != sizeof(*rp)) {
+			status = MGMT_STATUS_FAILED;
+			eir_len = 0;
+		} else {
+			status = MGMT_STATUS_SUCCESS;
+			rp = (void *)skb->data;
+
+			eir_len = 5 + 18 + 18;
+			h192 = rp->hash;
+			r192 = rp->rand;
+			h256 = NULL;
+			r256 = NULL;
+		}
+	} else {
+		struct hci_rp_read_local_oob_ext_data *rp;
+
+		if (skb->len != sizeof(*rp)) {
+			status = MGMT_STATUS_FAILED;
+			eir_len = 0;
+		} else {
+			status = MGMT_STATUS_SUCCESS;
+			rp = (void *)skb->data;
+
+			if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) {
+				eir_len = 5 + 18 + 18;
+				h192 = NULL;
+				r192 = NULL;
+			} else {
+				eir_len = 5 + 18 + 18 + 18 + 18;
+				h192 = rp->hash192;
+				r192 = rp->rand192;
+			}
+
+			h256 = rp->hash256;
+			r256 = rp->rand256;
+		}
+	}
+
+	mgmt_rp = kmalloc(sizeof(*mgmt_rp) + eir_len, GFP_KERNEL);
+	if (!mgmt_rp)
+		goto done;
+
+	if (status)
+		goto send_rsp;
+
+	eir_len = eir_append_data(mgmt_rp->eir, 0, EIR_CLASS_OF_DEV,
+				  hdev->dev_class, 3);
+
+	if (h192 && r192) {
+		eir_len = eir_append_data(mgmt_rp->eir, eir_len,
+					  EIR_SSP_HASH_C192, h192, 16);
+		eir_len = eir_append_data(mgmt_rp->eir, eir_len,
+					  EIR_SSP_RAND_R192, r192, 16);
+	}
+
+	if (h256 && r256) {
+		eir_len = eir_append_data(mgmt_rp->eir, eir_len,
+					  EIR_SSP_HASH_C256, h256, 16);
+		eir_len = eir_append_data(mgmt_rp->eir, eir_len,
+					  EIR_SSP_RAND_R256, r256, 16);
+	}
+
+send_rsp:
+	mgmt_rp->type = mgmt_cp->type;
+	mgmt_rp->eir_len = cpu_to_le16(eir_len);
+
+	err = mgmt_cmd_complete(cmd->sk, hdev->id,
+				MGMT_OP_READ_LOCAL_OOB_EXT_DATA, status,
+				mgmt_rp, sizeof(*mgmt_rp) + eir_len);
+	if (err < 0 || status)
+		goto done;
+
+	hci_sock_set_flag(cmd->sk, HCI_MGMT_OOB_DATA_EVENTS);
+
+	err = mgmt_limited_event(MGMT_EV_LOCAL_OOB_DATA_UPDATED, hdev,
+				 mgmt_rp, sizeof(*mgmt_rp) + eir_len,
+				 HCI_MGMT_OOB_DATA_EVENTS, cmd->sk);
+done:
+	kfree(mgmt_rp);
+	mgmt_pending_remove(cmd);
+}
+
+static int read_local_ssp_oob_req(struct hci_dev *hdev, struct sock *sk,
+				  struct mgmt_cp_read_local_oob_ext_data *cp)
+{
+	struct mgmt_pending_cmd *cmd;
+	struct hci_request req;
+	int err;
+
+	cmd = mgmt_pending_add(sk, MGMT_OP_READ_LOCAL_OOB_EXT_DATA, hdev,
+			       cp, sizeof(*cp));
+	if (!cmd)
+		return -ENOMEM;
+
+	hci_req_init(&req, hdev);
+
+	if (bredr_sc_enabled(hdev))
+		hci_req_add(&req, HCI_OP_READ_LOCAL_OOB_EXT_DATA, 0, NULL);
+	else
+		hci_req_add(&req, HCI_OP_READ_LOCAL_OOB_DATA, 0, NULL);
+
+	err = hci_req_run_skb(&req, read_local_oob_ext_data_complete);
+	if (err < 0) {
+		mgmt_pending_remove(cmd);
+		return err;
+	}
+
+	return 0;
+}
+
 static int read_local_oob_ext_data(struct sock *sk, struct hci_dev *hdev,
 				   void *data, u16 data_len)
 {
@@ -6517,8 +6656,19 @@ static int read_local_oob_ext_data(struct sock *sk, struct hci_dev *hdev,
 	eir_len = 0;
 	switch (cp->type) {
 	case BIT(BDADDR_BREDR):
-		eir_len = eir_append_data(rp->eir, eir_len, EIR_CLASS_OF_DEV,
-					  hdev->dev_class, 3);
+		if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
+			err = read_local_ssp_oob_req(hdev, sk, cp);
+			hci_dev_unlock(hdev);
+			if (!err)
+				goto done;
+
+			status = MGMT_STATUS_FAILED;
+			goto complete;
+		} else {
+			eir_len = eir_append_data(rp->eir, eir_len,
+						  EIR_CLASS_OF_DEV,
+						  hdev->dev_class, 3);
+		}
 		break;
 	case (BIT(BDADDR_LE_PUBLIC) | BIT(BDADDR_LE_RANDOM)):
 		if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&