Bluetooth: Add framework for Microsoft vendor extension

Micrsoft defined a set for HCI vendor extensions. Check the following
link for details:

https://docs.microsoft.com/en-us/windows-hardware/drivers/bluetooth/microsoft-defined-bluetooth-hci-commands-and-events

This provides the basic framework to enable the extension and read its
supported features. Drivers still have to declare support for this
extension before it can be utilized by the host stack.

Signed-off-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 141 insertions, 0 deletions

diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
new file mode 100644
index 000000000000..d6c4e6b5ae77
--- /dev/null
+++ b/net/bluetooth/msft.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google Corporation
+ */
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "msft.h"
+
+#define MSFT_OP_READ_SUPPORTED_FEATURES		0x00
+struct msft_cp_read_supported_features {
+	__u8   sub_opcode;
+} __packed;
+struct msft_rp_read_supported_features {
+	__u8   status;
+	__u8   sub_opcode;
+	__le64 features;
+	__u8   evt_prefix_len;
+	__u8   evt_prefix[0];
+} __packed;
+
+struct msft_data {
+	__u64 features;
+	__u8  evt_prefix_len;
+	__u8  *evt_prefix;
+};
+
+static bool read_supported_features(struct hci_dev *hdev,
+				    struct msft_data *msft)
+{
+	struct msft_cp_read_supported_features cp;
+	struct msft_rp_read_supported_features *rp;
+	struct sk_buff *skb;
+
+	cp.sub_opcode = MSFT_OP_READ_SUPPORTED_FEATURES;
+
+	skb = __hci_cmd_sync(hdev, hdev->msft_opcode, sizeof(cp), &cp,
+			     HCI_CMD_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Failed to read MSFT supported features (%ld)",
+			   PTR_ERR(skb));
+		return false;
+	}
+
+	if (skb->len < sizeof(*rp)) {
+		bt_dev_err(hdev, "MSFT supported features length mismatch");
+		goto failed;
+	}
+
+	rp = (struct msft_rp_read_supported_features *)skb->data;
+
+	if (rp->sub_opcode != MSFT_OP_READ_SUPPORTED_FEATURES)
+		goto failed;
+
+	if (rp->evt_prefix_len > 0) {
+		msft->evt_prefix = kmemdup(rp->evt_prefix, rp->evt_prefix_len,
+					   GFP_KERNEL);
+		if (!msft->evt_prefix)
+			goto failed;
+	}
+
+	msft->evt_prefix_len = rp->evt_prefix_len;
+	msft->features = __le64_to_cpu(rp->features);
+
+	kfree_skb(skb);
+	return true;
+
+failed:
+	kfree_skb(skb);
+	return false;
+}
+
+void msft_do_open(struct hci_dev *hdev)
+{
+	struct msft_data *msft;
+
+	if (hdev->msft_opcode == HCI_OP_NOP)
+		return;
+
+	bt_dev_dbg(hdev, "Initialize MSFT extension");
+
+	msft = kzalloc(sizeof(*msft), GFP_KERNEL);
+	if (!msft)
+		return;
+
+	if (!read_supported_features(hdev, msft)) {
+		kfree(msft);
+		return;
+	}
+
+	hdev->msft_data = msft;
+}
+
+void msft_do_close(struct hci_dev *hdev)
+{
+	struct msft_data *msft = hdev->msft_data;
+
+	if (!msft)
+		return;
+
+	bt_dev_dbg(hdev, "Cleanup of MSFT extension");
+
+	hdev->msft_data = NULL;
+
+	kfree(msft->evt_prefix);
+	kfree(msft);
+}
+
+void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct msft_data *msft = hdev->msft_data;
+	u8 event;
+
+	if (!msft)
+		return;
+
+	/* When the extension has defined an event prefix, check that it
+	 * matches, and otherwise just return.
+	 */
+	if (msft->evt_prefix_len > 0) {
+		if (skb->len < msft->evt_prefix_len)
+			return;
+
+		if (memcmp(skb->data, msft->evt_prefix, msft->evt_prefix_len))
+			return;
+
+		skb_pull(skb, msft->evt_prefix_len);
+	}
+
+	/* Every event starts at least with an event code and the rest of
+	 * the data is variable and depends on the event code.
+	 */
+	if (skb->len < 1)
+		return;
+
+	event = *skb->data;
+	skb_pull(skb, 1);
+
+	bt_dev_dbg(hdev, "MSFT vendor event %u", event);
+}