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![Kai Ye](/assets/img/avatar_default.png)
According to Documentation/core-api/printk-formats.rst, Use the correct print format. Printing an unsigned int value should use %u instead of %d. Otherwise printk() might end up displaying negative numbers. Signed-off-by: Kai Ye <yekai13@huawei.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
615 lines
15 KiB
C
615 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 Google Corporation
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*/
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/mgmt.h>
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#include "hci_request.h"
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#include "mgmt_util.h"
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#include "msft.h"
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#define MSFT_RSSI_THRESHOLD_VALUE_MIN -127
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#define MSFT_RSSI_THRESHOLD_VALUE_MAX 20
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#define MSFT_RSSI_LOW_TIMEOUT_MAX 0x3C
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#define MSFT_OP_READ_SUPPORTED_FEATURES 0x00
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struct msft_cp_read_supported_features {
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__u8 sub_opcode;
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} __packed;
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struct msft_rp_read_supported_features {
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__u8 status;
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__u8 sub_opcode;
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__le64 features;
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__u8 evt_prefix_len;
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__u8 evt_prefix[];
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} __packed;
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#define MSFT_OP_LE_MONITOR_ADVERTISEMENT 0x03
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#define MSFT_MONITOR_ADVERTISEMENT_TYPE_PATTERN 0x01
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struct msft_le_monitor_advertisement_pattern {
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__u8 length;
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__u8 data_type;
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__u8 start_byte;
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__u8 pattern[];
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};
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struct msft_le_monitor_advertisement_pattern_data {
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__u8 count;
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__u8 data[];
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};
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struct msft_cp_le_monitor_advertisement {
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__u8 sub_opcode;
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__s8 rssi_high;
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__s8 rssi_low;
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__u8 rssi_low_interval;
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__u8 rssi_sampling_period;
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__u8 cond_type;
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__u8 data[];
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} __packed;
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struct msft_rp_le_monitor_advertisement {
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__u8 status;
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__u8 sub_opcode;
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__u8 handle;
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} __packed;
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#define MSFT_OP_LE_CANCEL_MONITOR_ADVERTISEMENT 0x04
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struct msft_cp_le_cancel_monitor_advertisement {
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__u8 sub_opcode;
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__u8 handle;
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} __packed;
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struct msft_rp_le_cancel_monitor_advertisement {
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__u8 status;
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__u8 sub_opcode;
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} __packed;
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#define MSFT_OP_LE_SET_ADVERTISEMENT_FILTER_ENABLE 0x05
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struct msft_cp_le_set_advertisement_filter_enable {
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__u8 sub_opcode;
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__u8 enable;
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} __packed;
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struct msft_rp_le_set_advertisement_filter_enable {
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__u8 status;
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__u8 sub_opcode;
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} __packed;
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struct msft_monitor_advertisement_handle_data {
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__u8 msft_handle;
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__u16 mgmt_handle;
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struct list_head list;
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};
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struct msft_data {
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__u64 features;
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__u8 evt_prefix_len;
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__u8 *evt_prefix;
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struct list_head handle_map;
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__u16 pending_add_handle;
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__u16 pending_remove_handle;
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__u8 reregistering;
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__u8 filter_enabled;
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};
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static int __msft_add_monitor_pattern(struct hci_dev *hdev,
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struct adv_monitor *monitor);
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bool msft_monitor_supported(struct hci_dev *hdev)
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{
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return !!(msft_get_features(hdev) & MSFT_FEATURE_MASK_LE_ADV_MONITOR);
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}
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static bool read_supported_features(struct hci_dev *hdev,
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struct msft_data *msft)
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{
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struct msft_cp_read_supported_features cp;
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struct msft_rp_read_supported_features *rp;
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struct sk_buff *skb;
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cp.sub_opcode = MSFT_OP_READ_SUPPORTED_FEATURES;
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skb = __hci_cmd_sync(hdev, hdev->msft_opcode, sizeof(cp), &cp,
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HCI_CMD_TIMEOUT);
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if (IS_ERR(skb)) {
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bt_dev_err(hdev, "Failed to read MSFT supported features (%ld)",
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PTR_ERR(skb));
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return false;
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}
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if (skb->len < sizeof(*rp)) {
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bt_dev_err(hdev, "MSFT supported features length mismatch");
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goto failed;
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}
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rp = (struct msft_rp_read_supported_features *)skb->data;
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if (rp->sub_opcode != MSFT_OP_READ_SUPPORTED_FEATURES)
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goto failed;
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if (rp->evt_prefix_len > 0) {
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msft->evt_prefix = kmemdup(rp->evt_prefix, rp->evt_prefix_len,
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GFP_KERNEL);
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if (!msft->evt_prefix)
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goto failed;
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}
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msft->evt_prefix_len = rp->evt_prefix_len;
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msft->features = __le64_to_cpu(rp->features);
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if (msft->features & MSFT_FEATURE_MASK_CURVE_VALIDITY)
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hdev->msft_curve_validity = true;
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kfree_skb(skb);
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return true;
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failed:
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kfree_skb(skb);
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return false;
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}
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/* This function requires the caller holds hdev->lock */
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static void reregister_monitor_on_restart(struct hci_dev *hdev, int handle)
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{
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struct adv_monitor *monitor;
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struct msft_data *msft = hdev->msft_data;
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int err;
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while (1) {
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monitor = idr_get_next(&hdev->adv_monitors_idr, &handle);
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if (!monitor) {
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/* All monitors have been reregistered */
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msft->reregistering = false;
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hci_update_background_scan(hdev);
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return;
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}
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msft->pending_add_handle = (u16)handle;
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err = __msft_add_monitor_pattern(hdev, monitor);
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/* If success, we return and wait for monitor added callback */
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if (!err)
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return;
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/* Otherwise remove the monitor and keep registering */
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hci_free_adv_monitor(hdev, monitor);
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handle++;
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}
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}
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void msft_do_open(struct hci_dev *hdev)
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{
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struct msft_data *msft;
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if (hdev->msft_opcode == HCI_OP_NOP)
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return;
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bt_dev_dbg(hdev, "Initialize MSFT extension");
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msft = kzalloc(sizeof(*msft), GFP_KERNEL);
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if (!msft)
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return;
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if (!read_supported_features(hdev, msft)) {
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kfree(msft);
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return;
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}
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INIT_LIST_HEAD(&msft->handle_map);
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hdev->msft_data = msft;
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if (msft_monitor_supported(hdev)) {
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msft->reregistering = true;
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msft_set_filter_enable(hdev, true);
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reregister_monitor_on_restart(hdev, 0);
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}
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}
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void msft_do_close(struct hci_dev *hdev)
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{
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struct msft_data *msft = hdev->msft_data;
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struct msft_monitor_advertisement_handle_data *handle_data, *tmp;
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struct adv_monitor *monitor;
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if (!msft)
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return;
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bt_dev_dbg(hdev, "Cleanup of MSFT extension");
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hdev->msft_data = NULL;
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list_for_each_entry_safe(handle_data, tmp, &msft->handle_map, list) {
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monitor = idr_find(&hdev->adv_monitors_idr,
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handle_data->mgmt_handle);
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if (monitor && monitor->state == ADV_MONITOR_STATE_OFFLOADED)
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monitor->state = ADV_MONITOR_STATE_REGISTERED;
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list_del(&handle_data->list);
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kfree(handle_data);
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}
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kfree(msft->evt_prefix);
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kfree(msft);
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}
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void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct msft_data *msft = hdev->msft_data;
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u8 event;
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if (!msft)
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return;
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/* When the extension has defined an event prefix, check that it
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* matches, and otherwise just return.
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*/
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if (msft->evt_prefix_len > 0) {
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if (skb->len < msft->evt_prefix_len)
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return;
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if (memcmp(skb->data, msft->evt_prefix, msft->evt_prefix_len))
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return;
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skb_pull(skb, msft->evt_prefix_len);
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}
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/* Every event starts at least with an event code and the rest of
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* the data is variable and depends on the event code.
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*/
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if (skb->len < 1)
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return;
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event = *skb->data;
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skb_pull(skb, 1);
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bt_dev_dbg(hdev, "MSFT vendor event %u", event);
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}
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__u64 msft_get_features(struct hci_dev *hdev)
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{
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struct msft_data *msft = hdev->msft_data;
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return msft ? msft->features : 0;
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}
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/* is_mgmt = true matches the handle exposed to userspace via mgmt.
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* is_mgmt = false matches the handle used by the msft controller.
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* This function requires the caller holds hdev->lock
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*/
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static struct msft_monitor_advertisement_handle_data *msft_find_handle_data
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(struct hci_dev *hdev, u16 handle, bool is_mgmt)
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{
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struct msft_monitor_advertisement_handle_data *entry;
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struct msft_data *msft = hdev->msft_data;
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list_for_each_entry(entry, &msft->handle_map, list) {
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if (is_mgmt && entry->mgmt_handle == handle)
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return entry;
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if (!is_mgmt && entry->msft_handle == handle)
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return entry;
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}
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return NULL;
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}
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static void msft_le_monitor_advertisement_cb(struct hci_dev *hdev,
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u8 status, u16 opcode,
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struct sk_buff *skb)
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{
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struct msft_rp_le_monitor_advertisement *rp;
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struct adv_monitor *monitor;
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struct msft_monitor_advertisement_handle_data *handle_data;
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struct msft_data *msft = hdev->msft_data;
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hci_dev_lock(hdev);
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monitor = idr_find(&hdev->adv_monitors_idr, msft->pending_add_handle);
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if (!monitor) {
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bt_dev_err(hdev, "msft add advmon: monitor %u is not found!",
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msft->pending_add_handle);
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status = HCI_ERROR_UNSPECIFIED;
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goto unlock;
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}
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if (status)
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goto unlock;
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rp = (struct msft_rp_le_monitor_advertisement *)skb->data;
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if (skb->len < sizeof(*rp)) {
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status = HCI_ERROR_UNSPECIFIED;
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goto unlock;
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}
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handle_data = kmalloc(sizeof(*handle_data), GFP_KERNEL);
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if (!handle_data) {
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status = HCI_ERROR_UNSPECIFIED;
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goto unlock;
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}
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handle_data->mgmt_handle = monitor->handle;
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handle_data->msft_handle = rp->handle;
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INIT_LIST_HEAD(&handle_data->list);
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list_add(&handle_data->list, &msft->handle_map);
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monitor->state = ADV_MONITOR_STATE_OFFLOADED;
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unlock:
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if (status && monitor)
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hci_free_adv_monitor(hdev, monitor);
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/* If in restart/reregister sequence, keep registering. */
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if (msft->reregistering)
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reregister_monitor_on_restart(hdev,
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msft->pending_add_handle + 1);
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hci_dev_unlock(hdev);
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if (!msft->reregistering)
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hci_add_adv_patterns_monitor_complete(hdev, status);
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}
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static void msft_le_cancel_monitor_advertisement_cb(struct hci_dev *hdev,
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u8 status, u16 opcode,
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struct sk_buff *skb)
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{
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struct msft_cp_le_cancel_monitor_advertisement *cp;
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struct msft_rp_le_cancel_monitor_advertisement *rp;
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struct adv_monitor *monitor;
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struct msft_monitor_advertisement_handle_data *handle_data;
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struct msft_data *msft = hdev->msft_data;
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int err;
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bool pending;
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if (status)
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goto done;
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rp = (struct msft_rp_le_cancel_monitor_advertisement *)skb->data;
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if (skb->len < sizeof(*rp)) {
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status = HCI_ERROR_UNSPECIFIED;
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goto done;
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}
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hci_dev_lock(hdev);
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cp = hci_sent_cmd_data(hdev, hdev->msft_opcode);
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handle_data = msft_find_handle_data(hdev, cp->handle, false);
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if (handle_data) {
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monitor = idr_find(&hdev->adv_monitors_idr,
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handle_data->mgmt_handle);
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if (monitor)
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hci_free_adv_monitor(hdev, monitor);
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list_del(&handle_data->list);
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kfree(handle_data);
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}
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/* If remove all monitors is required, we need to continue the process
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* here because the earlier it was paused when waiting for the
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* response from controller.
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*/
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if (msft->pending_remove_handle == 0) {
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pending = hci_remove_all_adv_monitor(hdev, &err);
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if (pending) {
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hci_dev_unlock(hdev);
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return;
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}
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if (err)
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status = HCI_ERROR_UNSPECIFIED;
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}
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hci_dev_unlock(hdev);
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done:
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hci_remove_adv_monitor_complete(hdev, status);
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}
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static void msft_le_set_advertisement_filter_enable_cb(struct hci_dev *hdev,
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u8 status, u16 opcode,
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struct sk_buff *skb)
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{
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struct msft_cp_le_set_advertisement_filter_enable *cp;
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struct msft_rp_le_set_advertisement_filter_enable *rp;
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struct msft_data *msft = hdev->msft_data;
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rp = (struct msft_rp_le_set_advertisement_filter_enable *)skb->data;
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if (skb->len < sizeof(*rp))
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return;
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/* Error 0x0C would be returned if the filter enabled status is
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* already set to whatever we were trying to set.
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* Although the default state should be disabled, some controller set
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* the initial value to enabled. Because there is no way to know the
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* actual initial value before sending this command, here we also treat
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* error 0x0C as success.
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*/
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if (status != 0x00 && status != 0x0C)
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return;
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hci_dev_lock(hdev);
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cp = hci_sent_cmd_data(hdev, hdev->msft_opcode);
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msft->filter_enabled = cp->enable;
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if (status == 0x0C)
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bt_dev_warn(hdev, "MSFT filter_enable is already %s",
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cp->enable ? "on" : "off");
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hci_dev_unlock(hdev);
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}
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static bool msft_monitor_rssi_valid(struct adv_monitor *monitor)
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{
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struct adv_rssi_thresholds *r = &monitor->rssi;
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if (r->high_threshold < MSFT_RSSI_THRESHOLD_VALUE_MIN ||
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r->high_threshold > MSFT_RSSI_THRESHOLD_VALUE_MAX ||
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r->low_threshold < MSFT_RSSI_THRESHOLD_VALUE_MIN ||
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r->low_threshold > MSFT_RSSI_THRESHOLD_VALUE_MAX)
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return false;
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/* High_threshold_timeout is not supported,
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* once high_threshold is reached, events are immediately reported.
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*/
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if (r->high_threshold_timeout != 0)
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return false;
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if (r->low_threshold_timeout > MSFT_RSSI_LOW_TIMEOUT_MAX)
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return false;
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/* Sampling period from 0x00 to 0xFF are all allowed */
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return true;
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}
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static bool msft_monitor_pattern_valid(struct adv_monitor *monitor)
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{
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return msft_monitor_rssi_valid(monitor);
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/* No additional check needed for pattern-based monitor */
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}
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/* This function requires the caller holds hdev->lock */
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static int __msft_add_monitor_pattern(struct hci_dev *hdev,
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struct adv_monitor *monitor)
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{
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struct msft_cp_le_monitor_advertisement *cp;
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struct msft_le_monitor_advertisement_pattern_data *pattern_data;
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struct msft_le_monitor_advertisement_pattern *pattern;
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struct adv_pattern *entry;
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struct hci_request req;
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struct msft_data *msft = hdev->msft_data;
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size_t total_size = sizeof(*cp) + sizeof(*pattern_data);
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ptrdiff_t offset = 0;
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u8 pattern_count = 0;
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int err = 0;
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if (!msft_monitor_pattern_valid(monitor))
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return -EINVAL;
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list_for_each_entry(entry, &monitor->patterns, list) {
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pattern_count++;
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total_size += sizeof(*pattern) + entry->length;
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}
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cp = kmalloc(total_size, GFP_KERNEL);
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if (!cp)
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return -ENOMEM;
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cp->sub_opcode = MSFT_OP_LE_MONITOR_ADVERTISEMENT;
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cp->rssi_high = monitor->rssi.high_threshold;
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cp->rssi_low = monitor->rssi.low_threshold;
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cp->rssi_low_interval = (u8)monitor->rssi.low_threshold_timeout;
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cp->rssi_sampling_period = monitor->rssi.sampling_period;
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cp->cond_type = MSFT_MONITOR_ADVERTISEMENT_TYPE_PATTERN;
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pattern_data = (void *)cp->data;
|
|
pattern_data->count = pattern_count;
|
|
|
|
list_for_each_entry(entry, &monitor->patterns, list) {
|
|
pattern = (void *)(pattern_data->data + offset);
|
|
/* the length also includes data_type and offset */
|
|
pattern->length = entry->length + 2;
|
|
pattern->data_type = entry->ad_type;
|
|
pattern->start_byte = entry->offset;
|
|
memcpy(pattern->pattern, entry->value, entry->length);
|
|
offset += sizeof(*pattern) + entry->length;
|
|
}
|
|
|
|
hci_req_init(&req, hdev);
|
|
hci_req_add(&req, hdev->msft_opcode, total_size, cp);
|
|
err = hci_req_run_skb(&req, msft_le_monitor_advertisement_cb);
|
|
kfree(cp);
|
|
|
|
if (!err)
|
|
msft->pending_add_handle = monitor->handle;
|
|
|
|
return err;
|
|
}
|
|
|
|
/* This function requires the caller holds hdev->lock */
|
|
int msft_add_monitor_pattern(struct hci_dev *hdev, struct adv_monitor *monitor)
|
|
{
|
|
struct msft_data *msft = hdev->msft_data;
|
|
|
|
if (!msft)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (msft->reregistering)
|
|
return -EBUSY;
|
|
|
|
return __msft_add_monitor_pattern(hdev, monitor);
|
|
}
|
|
|
|
/* This function requires the caller holds hdev->lock */
|
|
int msft_remove_monitor(struct hci_dev *hdev, struct adv_monitor *monitor,
|
|
u16 handle)
|
|
{
|
|
struct msft_cp_le_cancel_monitor_advertisement cp;
|
|
struct msft_monitor_advertisement_handle_data *handle_data;
|
|
struct hci_request req;
|
|
struct msft_data *msft = hdev->msft_data;
|
|
int err = 0;
|
|
|
|
if (!msft)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (msft->reregistering)
|
|
return -EBUSY;
|
|
|
|
handle_data = msft_find_handle_data(hdev, monitor->handle, true);
|
|
|
|
/* If no matched handle, just remove without telling controller */
|
|
if (!handle_data)
|
|
return -ENOENT;
|
|
|
|
cp.sub_opcode = MSFT_OP_LE_CANCEL_MONITOR_ADVERTISEMENT;
|
|
cp.handle = handle_data->msft_handle;
|
|
|
|
hci_req_init(&req, hdev);
|
|
hci_req_add(&req, hdev->msft_opcode, sizeof(cp), &cp);
|
|
err = hci_req_run_skb(&req, msft_le_cancel_monitor_advertisement_cb);
|
|
|
|
if (!err)
|
|
msft->pending_remove_handle = handle;
|
|
|
|
return err;
|
|
}
|
|
|
|
void msft_req_add_set_filter_enable(struct hci_request *req, bool enable)
|
|
{
|
|
struct hci_dev *hdev = req->hdev;
|
|
struct msft_cp_le_set_advertisement_filter_enable cp;
|
|
|
|
cp.sub_opcode = MSFT_OP_LE_SET_ADVERTISEMENT_FILTER_ENABLE;
|
|
cp.enable = enable;
|
|
|
|
hci_req_add(req, hdev->msft_opcode, sizeof(cp), &cp);
|
|
}
|
|
|
|
int msft_set_filter_enable(struct hci_dev *hdev, bool enable)
|
|
{
|
|
struct hci_request req;
|
|
struct msft_data *msft = hdev->msft_data;
|
|
int err;
|
|
|
|
if (!msft)
|
|
return -EOPNOTSUPP;
|
|
|
|
hci_req_init(&req, hdev);
|
|
msft_req_add_set_filter_enable(&req, enable);
|
|
err = hci_req_run_skb(&req, msft_le_set_advertisement_filter_enable_cb);
|
|
|
|
return err;
|
|
}
|
|
|
|
bool msft_curve_validity(struct hci_dev *hdev)
|
|
{
|
|
return hdev->msft_curve_validity;
|
|
}
|