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From:   Brian Gix <brian.gix@intel.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     marcel@holtmann.org, luiz.dentz@gmail.com, brian.gix@intel.com
Subject: [PATCH v2] Bluetooth: Normalize HCI_OP_READ_ENC_KEY_SIZE cmdcmplt
Date:   Tue, 16 Aug 2022 12:04:34 -0700
Message-Id: <20220816190434.1015206-1-brian.gix@intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The HCI_OP_READ_ENC_KEY_SIZE command is converted from using the
deprecated hci_request mechanism to use hci_send_cmd, with an
accompanying hci_cc_read_enc_key_size to handle it's return response.

Signed-off-by: Brian Gix <brian.gix@intel.com>
---
 net/bluetooth/hci_event.c | 92 +++++++++++++++++++--------------------
 1 file changed, 45 insertions(+), 47 deletions(-)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 938abe6352bf..2feb5af30d35 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -712,6 +712,47 @@ static u8 hci_cc_read_local_version(struct hci_dev *hdev, void *data,
 	return rp->status;
 }
 
+static u8 hci_cc_read_enc_key_size(struct hci_dev *hdev, void *data,
+				   struct sk_buff *skb)
+{
+	struct hci_rp_read_enc_key_size *rp = data;
+	struct hci_conn *conn;
+	u16 handle;
+	u8 status = rp->status;
+
+	bt_dev_dbg(hdev, "status 0x%2.2x", status);
+
+	handle = le16_to_cpu(rp->handle);
+
+	hci_dev_lock(hdev);
+
+	conn = hci_conn_hash_lookup_handle(hdev, handle);
+	if (!conn) {
+		status = 0xFF;
+		goto done;
+	}
+
+	/* While unexpected, the read_enc_key_size command may fail. The most
+	 * secure approach is to then assume the key size is 0 to force a
+	 * disconnection.
+	 */
+	if (status) {
+		bt_dev_err(hdev, "failed to read key size for handle %u",
+			   handle);
+		conn->enc_key_size = 0;
+	} else {
+		conn->enc_key_size = rp->key_size;
+		status = 0;
+	}
+
+	hci_encrypt_cfm(conn, 0);
+
+done:
+	hci_dev_unlock(hdev);
+
+	return status;
+}
+
 static u8 hci_cc_read_local_commands(struct hci_dev *hdev, void *data,
 				     struct sk_buff *skb)
 {
@@ -3534,47 +3575,6 @@ static void hci_remote_name_evt(struct hci_dev *hdev, void *data,
 	hci_dev_unlock(hdev);
 }
 
-static void read_enc_key_size_complete(struct hci_dev *hdev, u8 status,
-				       u16 opcode, struct sk_buff *skb)
-{
-	const struct hci_rp_read_enc_key_size *rp;
-	struct hci_conn *conn;
-	u16 handle;
-
-	BT_DBG("%s status 0x%02x", hdev->name, status);
-
-	if (!skb || skb->len < sizeof(*rp)) {
-		bt_dev_err(hdev, "invalid read key size response");
-		return;
-	}
-
-	rp = (void *)skb->data;
-	handle = le16_to_cpu(rp->handle);
-
-	hci_dev_lock(hdev);
-
-	conn = hci_conn_hash_lookup_handle(hdev, handle);
-	if (!conn)
-		goto unlock;
-
-	/* While unexpected, the read_enc_key_size command may fail. The most
-	 * secure approach is to then assume the key size is 0 to force a
-	 * disconnection.
-	 */
-	if (rp->status) {
-		bt_dev_err(hdev, "failed to read key size for handle %u",
-			   handle);
-		conn->enc_key_size = 0;
-	} else {
-		conn->enc_key_size = rp->key_size;
-	}
-
-	hci_encrypt_cfm(conn, 0);
-
-unlock:
-	hci_dev_unlock(hdev);
-}
-
 static void hci_encrypt_change_evt(struct hci_dev *hdev, void *data,
 				   struct sk_buff *skb)
 {
@@ -3639,7 +3639,6 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, void *data,
 	/* Try reading the encryption key size for encrypted ACL links */
 	if (!ev->status && ev->encrypt && conn->type == ACL_LINK) {
 		struct hci_cp_read_enc_key_size cp;
-		struct hci_request req;
 
 		/* Only send HCI_Read_Encryption_Key_Size if the
 		 * controller really supports it. If it doesn't, assume
@@ -3650,12 +3649,9 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, void *data,
 			goto notify;
 		}
 
-		hci_req_init(&req, hdev);
-
 		cp.handle = cpu_to_le16(conn->handle);
-		hci_req_add(&req, HCI_OP_READ_ENC_KEY_SIZE, sizeof(cp), &cp);
-
-		if (hci_req_run_skb(&req, read_enc_key_size_complete)) {
+		if (hci_send_cmd(hdev, HCI_OP_READ_ENC_KEY_SIZE,
+				 sizeof(cp), &cp)) {
 			bt_dev_err(hdev, "sending read key size failed");
 			conn->enc_key_size = HCI_LINK_KEY_SIZE;
 			goto notify;
@@ -4037,6 +4033,8 @@ static const struct hci_cc {
 	       sizeof(struct hci_rp_read_local_amp_info)),
 	HCI_CC(HCI_OP_READ_CLOCK, hci_cc_read_clock,
 	       sizeof(struct hci_rp_read_clock)),
+	HCI_CC(HCI_OP_READ_ENC_KEY_SIZE, hci_cc_read_enc_key_size,
+	       sizeof(struct hci_rp_read_enc_key_size)),
 	HCI_CC(HCI_OP_READ_INQ_RSP_TX_POWER, hci_cc_read_inq_rsp_tx_power,
 	       sizeof(struct hci_rp_read_inq_rsp_tx_power)),
 	HCI_CC(HCI_OP_READ_DEF_ERR_DATA_REPORTING,
-- 
2.37.1