From: Tedd Ho-Jeong An <[email protected]>
This patch adds new opcode(0x03) for HCI Vendor packet to support
creating extended device mode. In order to avoid the conflict with the
legacy opcode, it has to be 0x03 only and all other bits must be set to
zero.
Then, it is followed by the extended configuration data that contains
the device type and the flags to be used.
Signed-off-by: Tedd Ho-Jeong An <[email protected]>
---
drivers/bluetooth/hci_vhci.c | 156 +++++++++++++++++++++++++++++++++--
1 file changed, 150 insertions(+), 6 deletions(-)
diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
index 49ac884d996e..d1177a079f98 100644
--- a/drivers/bluetooth/hci_vhci.c
+++ b/drivers/bluetooth/hci_vhci.c
@@ -30,6 +30,24 @@
static bool amp;
+/* This is the struct for extended device configuration.
+ * The opcode 0x03 is used for creating an extended device and followed by
+ * the configuration data below.
+ * dev_type is Primay or AMP.
+ * flag_len is the lenght or flag array
+ * flag array contains the flag to use/set while creating the device.
+ */
+struct vhci_ext_config {
+ __u8 dev_type;
+ __u8 flag_len;
+ __u8 flag[0];
+};
+
+#define VHCI_EXT_FLAG_ENABLE_AOSP 0x01
+#define VHCI_EXT_FLAG_QUIRK_RAW_DEVICE 0x02
+#define VHCI_EXT_FLAG_QUIARK_EXTERNAL_CONFIG 0x03
+#define VHCI_EXT_FLAG_QUIRK_INVALID_BDADDR 0x04
+
struct vhci_data {
struct hci_dev *hdev;
@@ -375,6 +393,124 @@ static int vhci_create_device(struct vhci_data *data, __u8 opcode)
return err;
}
+static int __vhci_create_extended_device(struct vhci_data *data,
+ struct sk_buff *skb)
+{
+ struct hci_dev *hdev;
+ struct sk_buff *resp;
+ struct vhci_ext_config *config;
+ int i;
+ __u8 flag;
+
+ if (data->hdev)
+ return -EBADFD;
+
+ /* Make sure the skb has a minimum vaild length */
+ if (skb->len < sizeof(*config))
+ return -EINVAL;
+
+ config = (void *)(skb->data);
+ if (skb->len < sizeof(*config) + config->flag_len)
+ return -EINVAL;
+
+ if (config->dev_type != HCI_PRIMARY && config->dev_type != HCI_AMP)
+ return -EINVAL;
+
+ resp = bt_skb_alloc(4, GFP_KERNEL);
+ if (!resp)
+ return -ENOMEM;
+
+ hdev = hci_alloc_dev();
+ if (!hdev) {
+ kfree_skb(resp);
+ return -ENOMEM;
+ }
+
+ data->hdev = hdev;
+
+ hdev->bus = HCI_VIRTUAL;
+ hdev->dev_type = config->dev_type;
+ hci_set_drvdata(hdev, data);
+
+ hdev->open = vhci_open_dev;
+ hdev->close = vhci_close_dev;
+ hdev->flush = vhci_flush;
+ hdev->send = vhci_send_frame;
+ hdev->get_data_path_id = vhci_get_data_path_id;
+ hdev->get_codec_config_data = vhci_get_codec_config_data;
+ hdev->wakeup = vhci_wakeup;
+ hdev->setup = vhci_setup;
+ set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
+
+ for (i = 0; i < config->flag_len; i++) {
+ flag = config->flag[i];
+ switch(flag) {
+ case VHCI_EXT_FLAG_ENABLE_AOSP:
+ data->aosp_capable = 1;
+ break;
+ case VHCI_EXT_FLAG_QUIRK_RAW_DEVICE:
+ set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
+ break;
+ case VHCI_EXT_FLAG_QUIARK_EXTERNAL_CONFIG:
+ set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
+ break;
+ case VHCI_EXT_FLAG_QUIRK_INVALID_BDADDR:
+ set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
+ break;
+ default:
+ BT_ERR("Invalid flag");
+ hci_free_dev(hdev);
+ data->hdev = NULL;
+ kfree_skb(resp);
+ return -EINVAL;
+ }
+ }
+
+ if (hci_register_dev(hdev) < 0) {
+ BT_ERR("Can't register HCI device");
+ hci_free_dev(hdev);
+ data->hdev = NULL;
+ kfree_skb(resp);
+ return -EBUSY;
+ }
+
+ debugfs_create_file("force_suspend", 0644, hdev->debugfs, data,
+ &force_suspend_fops);
+
+ debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
+ &force_wakeup_fops);
+
+ if (IS_ENABLED(CONFIG_BT_MSFTEXT))
+ debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
+ &msft_opcode_fops);
+
+ if (IS_ENABLED(CONFIG_BT_AOSPEXT))
+ debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
+ &aosp_capable_fops);
+
+ hci_skb_pkt_type(resp) = HCI_VENDOR_PKT;
+
+ skb_put_u8(resp, 0xff);
+ skb_put_u8(resp, 0x03);
+ put_unaligned_le16(hdev->id, skb_put(resp, 2));
+ skb_queue_tail(&data->readq, resp);
+
+ wake_up_interruptible(&data->read_wait);
+ return 0;
+}
+
+static int vhci_create_extended_device(struct vhci_data *data,
+ struct sk_buff *skb)
+{
+ int err;
+
+ mutex_lock(&data->open_mutex);
+ err = __vhci_create_extended_device(data, skb);
+ mutex_unlock(&data->open_mutex);
+
+ return err;
+}
+
static inline ssize_t vhci_get_user(struct vhci_data *data,
struct iov_iter *from)
{
@@ -419,14 +555,22 @@ static inline ssize_t vhci_get_user(struct vhci_data *data,
opcode = *((__u8 *) skb->data);
skb_pull(skb, 1);
- if (skb->len > 0) {
- kfree_skb(skb);
- return -EINVAL;
+ /* The dev_type 3 is used as an escape opcode for extension
+ * handling. If dev_type is set to 3 all other bits must be
+ * set to zero.
+ */
+ if (opcode == 0x03) {
+ if (skb->len < 1)
+ ret = -EINVAL;
+ else
+ ret = vhci_create_extended_device(data, skb);
+ } else {
+ if (skb->len > 0)
+ ret = -EINVAL;
+ else
+ ret = vhci_create_device(data, opcode);
}
-
kfree_skb(skb);
-
- ret = vhci_create_device(data, opcode);
break;
default:
--
2.25.1
Hi Tedd,
On Thu, Nov 4, 2021 at 6:34 PM Tedd Ho-Jeong An <[email protected]> wrote:
>
> From: Tedd Ho-Jeong An <[email protected]>
>
> This patch adds new opcode(0x03) for HCI Vendor packet to support
> creating extended device mode. In order to avoid the conflict with the
> legacy opcode, it has to be 0x03 only and all other bits must be set to
> zero.
>
> Then, it is followed by the extended configuration data that contains
> the device type and the flags to be used.
>
> Signed-off-by: Tedd Ho-Jeong An <[email protected]>
> ---
> drivers/bluetooth/hci_vhci.c | 156 +++++++++++++++++++++++++++++++++--
> 1 file changed, 150 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
> index 49ac884d996e..d1177a079f98 100644
> --- a/drivers/bluetooth/hci_vhci.c
> +++ b/drivers/bluetooth/hci_vhci.c
> @@ -30,6 +30,24 @@
>
> static bool amp;
>
> +/* This is the struct for extended device configuration.
> + * The opcode 0x03 is used for creating an extended device and followed by
> + * the configuration data below.
> + * dev_type is Primay or AMP.
> + * flag_len is the lenght or flag array
> + * flag array contains the flag to use/set while creating the device.
> + */
> +struct vhci_ext_config {
> + __u8 dev_type;
> + __u8 flag_len;
> + __u8 flag[0];
> +};
> +
> +#define VHCI_EXT_FLAG_ENABLE_AOSP 0x01
> +#define VHCI_EXT_FLAG_QUIRK_RAW_DEVICE 0x02
> +#define VHCI_EXT_FLAG_QUIARK_EXTERNAL_CONFIG 0x03
> +#define VHCI_EXT_FLAG_QUIRK_INVALID_BDADDR 0x04
> +
> struct vhci_data {
> struct hci_dev *hdev;
>
> @@ -375,6 +393,124 @@ static int vhci_create_device(struct vhci_data *data, __u8 opcode)
> return err;
> }
>
> +static int __vhci_create_extended_device(struct vhci_data *data,
> + struct sk_buff *skb)
> +{
> + struct hci_dev *hdev;
> + struct sk_buff *resp;
> + struct vhci_ext_config *config;
> + int i;
> + __u8 flag;
> +
> + if (data->hdev)
> + return -EBADFD;
> +
> + /* Make sure the skb has a minimum vaild length */
> + if (skb->len < sizeof(*config))
> + return -EINVAL;
> +
> + config = (void *)(skb->data);
> + if (skb->len < sizeof(*config) + config->flag_len)
> + return -EINVAL;
> +
> + if (config->dev_type != HCI_PRIMARY && config->dev_type != HCI_AMP)
> + return -EINVAL;
> +
> + resp = bt_skb_alloc(4, GFP_KERNEL);
> + if (!resp)
> + return -ENOMEM;
> +
> + hdev = hci_alloc_dev();
> + if (!hdev) {
> + kfree_skb(resp);
> + return -ENOMEM;
> + }
> +
> + data->hdev = hdev;
> +
> + hdev->bus = HCI_VIRTUAL;
> + hdev->dev_type = config->dev_type;
> + hci_set_drvdata(hdev, data);
> +
> + hdev->open = vhci_open_dev;
> + hdev->close = vhci_close_dev;
> + hdev->flush = vhci_flush;
> + hdev->send = vhci_send_frame;
> + hdev->get_data_path_id = vhci_get_data_path_id;
> + hdev->get_codec_config_data = vhci_get_codec_config_data;
> + hdev->wakeup = vhci_wakeup;
> + hdev->setup = vhci_setup;
> + set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
> +
> + for (i = 0; i < config->flag_len; i++) {
> + flag = config->flag[i];
> + switch(flag) {
> + case VHCI_EXT_FLAG_ENABLE_AOSP:
> + data->aosp_capable = 1;
> + break;
> + case VHCI_EXT_FLAG_QUIRK_RAW_DEVICE:
> + set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
> + break;
> + case VHCI_EXT_FLAG_QUIARK_EXTERNAL_CONFIG:
> + set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
> + break;
> + case VHCI_EXT_FLAG_QUIRK_INVALID_BDADDR:
> + set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> + break;
> + default:
> + BT_ERR("Invalid flag");
> + hci_free_dev(hdev);
> + data->hdev = NULL;
> + kfree_skb(resp);
> + return -EINVAL;
> + }
> + }
We can probably move the code below to a common function e.g.
vhci_register_dev since it should be the same for both old and new
commands, so that would take care of calling hci_register_dev and
registering the debugfs entries.
> + if (hci_register_dev(hdev) < 0) {
> + BT_ERR("Can't register HCI device");
> + hci_free_dev(hdev);
> + data->hdev = NULL;
> + kfree_skb(resp);
> + return -EBUSY;
> + }
> +
> + debugfs_create_file("force_suspend", 0644, hdev->debugfs, data,
> + &force_suspend_fops);
> +
> + debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
> + &force_wakeup_fops);
> +
> + if (IS_ENABLED(CONFIG_BT_MSFTEXT))
> + debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
> + &msft_opcode_fops);
> +
> + if (IS_ENABLED(CONFIG_BT_AOSPEXT))
> + debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
> + &aosp_capable_fops);
> +
> + hci_skb_pkt_type(resp) = HCI_VENDOR_PKT;
> +
> + skb_put_u8(resp, 0xff);
> + skb_put_u8(resp, 0x03);
> + put_unaligned_le16(hdev->id, skb_put(resp, 2));
> + skb_queue_tail(&data->readq, resp);
> +
> + wake_up_interruptible(&data->read_wait);
> + return 0;
> +}
> +
> +static int vhci_create_extended_device(struct vhci_data *data,
> + struct sk_buff *skb)
> +{
> + int err;
> +
> + mutex_lock(&data->open_mutex);
> + err = __vhci_create_extended_device(data, skb);
> + mutex_unlock(&data->open_mutex);
> +
> + return err;
> +}
> +
> static inline ssize_t vhci_get_user(struct vhci_data *data,
> struct iov_iter *from)
> {
> @@ -419,14 +555,22 @@ static inline ssize_t vhci_get_user(struct vhci_data *data,
> opcode = *((__u8 *) skb->data);
> skb_pull(skb, 1);
>
> - if (skb->len > 0) {
> - kfree_skb(skb);
> - return -EINVAL;
> + /* The dev_type 3 is used as an escape opcode for extension
> + * handling. If dev_type is set to 3 all other bits must be
> + * set to zero.
> + */
> + if (opcode == 0x03) {
> + if (skb->len < 1)
> + ret = -EINVAL;
> + else
> + ret = vhci_create_extended_device(data, skb);
> + } else {
> + if (skb->len > 0)
> + ret = -EINVAL;
> + else
> + ret = vhci_create_device(data, opcode);
> }
> -
> kfree_skb(skb);
> -
> - ret = vhci_create_device(data, opcode);
> break;
>
> default:
> --
> 2.25.1
>
--
Luiz Augusto von Dentz