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Date:   Tue, 22 Dec 2020 21:13:49 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Claire Chang <tientzu@...omium.org>,
        Alain Michaud <alainm@...omium.org>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 060/217] Bluetooth: Move force_bredr_smp debugfs into hci_debugfs_create_bredr

From: Claire Chang <tientzu@...omium.org>

[ Upstream commit 82493316507a720b6faa2ec23971c0ca89c6dcb0 ]

Avoid multiple attempts to create the debugfs entry, force_bredr_smp,
by moving it from the SMP registration to the BR/EDR controller init
section. hci_debugfs_create_bredr is only called when HCI_SETUP and
HCI_CONFIG is not set.

Signed-off-by: Claire Chang <tientzu@...omium.org>
Reviewed-by: Alain Michaud <alainm@...omium.org>
Reviewed-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bluetooth/hci_debugfs.c | 50 +++++++++++++++++++++++++++++++++++++
 net/bluetooth/smp.c         | 44 ++------------------------------
 net/bluetooth/smp.h         |  2 ++
 3 files changed, 54 insertions(+), 42 deletions(-)

diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c
index 5e8af2658e44a..4626e0289a970 100644
--- a/net/bluetooth/hci_debugfs.c
+++ b/net/bluetooth/hci_debugfs.c
@@ -494,6 +494,45 @@ static int auto_accept_delay_get(void *data, u64 *val)
 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
 			auto_accept_delay_set, "%llu\n");
 
+static ssize_t force_bredr_smp_read(struct file *file,
+				    char __user *user_buf,
+				    size_t count, loff_t *ppos)
+{
+	struct hci_dev *hdev = file->private_data;
+	char buf[3];
+
+	buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y' : 'N';
+	buf[1] = '\n';
+	buf[2] = '\0';
+	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t force_bredr_smp_write(struct file *file,
+				     const char __user *user_buf,
+				     size_t count, loff_t *ppos)
+{
+	struct hci_dev *hdev = file->private_data;
+	bool enable;
+	int err;
+
+	err = kstrtobool_from_user(user_buf, count, &enable);
+	if (err)
+		return err;
+
+	err = smp_force_bredr(hdev, enable);
+	if (err)
+		return err;
+
+	return count;
+}
+
+static const struct file_operations force_bredr_smp_fops = {
+	.open		= simple_open,
+	.read		= force_bredr_smp_read,
+	.write		= force_bredr_smp_write,
+	.llseek		= default_llseek,
+};
+
 static int idle_timeout_set(void *data, u64 val)
 {
 	struct hci_dev *hdev = data;
@@ -589,6 +628,17 @@ void hci_debugfs_create_bredr(struct hci_dev *hdev)
 	debugfs_create_file("voice_setting", 0444, hdev->debugfs, hdev,
 			    &voice_setting_fops);
 
+	/* If the controller does not support BR/EDR Secure Connections
+	 * feature, then the BR/EDR SMP channel shall not be present.
+	 *
+	 * To test this with Bluetooth 4.0 controllers, create a debugfs
+	 * switch that allows forcing BR/EDR SMP support and accepting
+	 * cross-transport pairing on non-AES encrypted connections.
+	 */
+	if (!lmp_sc_capable(hdev))
+		debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs,
+				    hdev, &force_bredr_smp_fops);
+
 	if (lmp_ssp_capable(hdev)) {
 		debugfs_create_file("ssp_debug_mode", 0444, hdev->debugfs,
 				    hdev, &ssp_debug_mode_fops);
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index bf4bef13d9354..c659c464f7ca0 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -3353,31 +3353,8 @@ static void smp_del_chan(struct l2cap_chan *chan)
 	l2cap_chan_put(chan);
 }
 
-static ssize_t force_bredr_smp_read(struct file *file,
-				    char __user *user_buf,
-				    size_t count, loff_t *ppos)
+int smp_force_bredr(struct hci_dev *hdev, bool enable)
 {
-	struct hci_dev *hdev = file->private_data;
-	char buf[3];
-
-	buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N';
-	buf[1] = '\n';
-	buf[2] = '\0';
-	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
-}
-
-static ssize_t force_bredr_smp_write(struct file *file,
-				     const char __user *user_buf,
-				     size_t count, loff_t *ppos)
-{
-	struct hci_dev *hdev = file->private_data;
-	bool enable;
-	int err;
-
-	err = kstrtobool_from_user(user_buf, count, &enable);
-	if (err)
-		return err;
-
 	if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
 		return -EALREADY;
 
@@ -3399,16 +3376,9 @@ static ssize_t force_bredr_smp_write(struct file *file,
 
 	hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
 
-	return count;
+	return 0;
 }
 
-static const struct file_operations force_bredr_smp_fops = {
-	.open		= simple_open,
-	.read		= force_bredr_smp_read,
-	.write		= force_bredr_smp_write,
-	.llseek		= default_llseek,
-};
-
 int smp_register(struct hci_dev *hdev)
 {
 	struct l2cap_chan *chan;
@@ -3433,17 +3403,7 @@ int smp_register(struct hci_dev *hdev)
 
 	hdev->smp_data = chan;
 
-	/* If the controller does not support BR/EDR Secure Connections
-	 * feature, then the BR/EDR SMP channel shall not be present.
-	 *
-	 * To test this with Bluetooth 4.0 controllers, create a debugfs
-	 * switch that allows forcing BR/EDR SMP support and accepting
-	 * cross-transport pairing on non-AES encrypted connections.
-	 */
 	if (!lmp_sc_capable(hdev)) {
-		debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs,
-				    hdev, &force_bredr_smp_fops);
-
 		/* Flag can be already set here (due to power toggle) */
 		if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
 			return 0;
diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h
index 121edadd5f8da..fc35a8bf358e8 100644
--- a/net/bluetooth/smp.h
+++ b/net/bluetooth/smp.h
@@ -193,6 +193,8 @@ bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
 int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa);
 int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]);
 
+int smp_force_bredr(struct hci_dev *hdev, bool enable);
+
 int smp_register(struct hci_dev *hdev);
 void smp_unregister(struct hci_dev *hdev);
 
-- 
2.27.0

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