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Subject[PATCH v1 2/7] Bluetooth: Add handler of MGMT_OP_READ_ADV_MONITOR_FEATURES
Date
This adds the request handler of MGMT_OP_READ_ADV_MONITOR_FEATURES
command. Since the controller-based monitoring is not yet in place, this
report only the supported features but not the enabled features.

The following test was performed.
- Issuing btmgmt advmon-features.

Signed-off-by: Miao-chen Chou <mcchou@chromium.org>
---

include/net/bluetooth/hci_core.h | 24 +++++++++++++++++
net/bluetooth/hci_core.c | 10 ++++++-
net/bluetooth/mgmt.c | 46 ++++++++++++++++++++++++++++++++
net/bluetooth/msft.c | 7 +++++
net/bluetooth/msft.h | 9 +++++++
5 files changed, 95 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index cdd4f1db8670e..431fe0265dcfb 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -25,6 +25,7 @@
#ifndef __HCI_CORE_H
#define __HCI_CORE_H

+#include <linux/idr.h>
#include <linux/leds.h>
#include <linux/rculist.h>

@@ -220,6 +221,24 @@ struct adv_info {
#define HCI_MAX_ADV_INSTANCES 5
#define HCI_DEFAULT_ADV_DURATION 2

+struct adv_pattern {
+ struct list_head list;
+ __u8 ad_type;
+ __u8 offset;
+ __u8 length;
+ __u8 value[HCI_MAX_AD_LENGTH];
+};
+
+struct adv_monitor {
+ struct list_head patterns;
+ bool active;
+ __u16 handle;
+};
+
+#define HCI_MIN_ADV_MONITOR_HANDLE 1
+#define HCI_MAX_ADV_MONITOR_NUM_HANDLES 32
+#define HCI_MAX_ADV_MONITOR_NUM_PATTERNS 16
+
#define HCI_MAX_SHORT_NAME_LENGTH 10

/* Min encryption key size to match with SMP */
@@ -477,6 +496,9 @@ struct hci_dev {
__u16 adv_instance_timeout;
struct delayed_work adv_instance_expire;

+ struct idr adv_monitors_idr;
+ unsigned int adv_monitors_cnt;
+
__u8 irk[16];
__u32 rpa_timeout;
struct delayed_work rpa_expired;
@@ -1217,6 +1239,8 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance);
void hci_adv_instances_set_rpa_expired(struct hci_dev *hdev, bool rpa_expired);

+void hci_adv_monitors_clear(struct hci_dev *hdev);
+
void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);

void hci_init_sysfs(struct hci_dev *hdev);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index dbe2d79f233fb..23bfe4f1d1e9d 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -26,7 +26,6 @@
/* Bluetooth HCI core. */

#include <linux/export.h>
-#include <linux/idr.h>
#include <linux/rfkill.h>
#include <linux/debugfs.h>
#include <linux/crypto.h>
@@ -2996,6 +2995,12 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
return 0;
}

+/* This function requires the caller holds hdev->lock */
+void hci_adv_monitors_clear(struct hci_dev *hdev)
+{
+ idr_destroy(&hdev->adv_monitors_idr);
+}
+
struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *bdaddr_list,
bdaddr_t *bdaddr, u8 type)
{
@@ -3574,6 +3579,8 @@ int hci_register_dev(struct hci_dev *hdev)

queue_work(hdev->req_workqueue, &hdev->power_on);

+ idr_init(&hdev->adv_monitors_idr);
+
return id;

err_wqueue:
@@ -3644,6 +3651,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
hci_smp_irks_clear(hdev);
hci_remote_oob_data_clear(hdev);
hci_adv_instances_clear(hdev);
+ hci_adv_monitors_clear(hdev);
hci_bdaddr_list_clear(&hdev->le_white_list);
hci_bdaddr_list_clear(&hdev->le_resolv_list);
hci_conn_params_clear_all(hdev);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 9e8a3cccc6ca3..8d8275ee9718b 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -36,6 +36,7 @@
#include "hci_request.h"
#include "smp.h"
#include "mgmt_util.h"
+#include "msft.h"

#define MGMT_VERSION 1
#define MGMT_REVISION 17
@@ -111,6 +112,7 @@ static const u16 mgmt_commands[] = {
MGMT_OP_READ_SECURITY_INFO,
MGMT_OP_READ_EXP_FEATURES_INFO,
MGMT_OP_SET_EXP_FEATURE,
+ MGMT_OP_READ_ADV_MONITOR_FEATURES,
};

static const u16 mgmt_events[] = {
@@ -3849,6 +3851,49 @@ static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
MGMT_STATUS_NOT_SUPPORTED);
}

+static int read_adv_monitor_features(struct sock *sk, struct hci_dev *hdev,
+ void *data, u16 len)
+{
+ struct adv_monitor *monitor = NULL;
+ struct mgmt_rp_read_adv_monitor_features *rp = NULL;
+ int handle;
+ size_t rp_size = 0;
+ __u32 supported = 0;
+ __u16 num_handles = 0;
+ __u16 handles[HCI_MAX_ADV_MONITOR_NUM_HANDLES];
+
+ BT_DBG("request for %s", hdev->name);
+
+ hci_dev_lock(hdev);
+
+ if (msft_get_features(hdev) & MSFT_FEATURE_MASK_LE_ADV_MONITOR)
+ supported |= MGMT_ADV_MONITOR_FEATURE_MASK_OR_PATTERNS;
+
+ idr_for_each_entry(&hdev->adv_monitors_idr, monitor, handle)
+ handles[num_handles++] = monitor->handle;
+
+ hci_dev_unlock(hdev);
+
+ rp_size = sizeof(*rp) + (num_handles * sizeof(u16));
+ rp = kmalloc(rp_size, GFP_KERNEL);
+ if (!rp)
+ return -ENOMEM;
+
+ // Once controller-based monitoring is in place, the enabled_features
+ // should reflect the use.
+ rp->supported_features = supported;
+ rp->enabled_features = 0;
+ rp->max_num_handles = HCI_MAX_ADV_MONITOR_NUM_HANDLES;
+ rp->max_num_patterns = HCI_MAX_ADV_MONITOR_NUM_PATTERNS;
+ rp->num_handles = num_handles;
+ if (num_handles)
+ memcpy(&rp->handles, &handles, (num_handles * sizeof(u16)));
+
+ return mgmt_cmd_complete(sk, hdev->id,
+ MGMT_OP_READ_ADV_MONITOR_FEATURES,
+ MGMT_STATUS_SUCCESS, rp, rp_size);
+}
+
static void read_local_oob_data_complete(struct hci_dev *hdev, u8 status,
u16 opcode, struct sk_buff *skb)
{
@@ -7297,6 +7342,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
{ set_exp_feature, MGMT_SET_EXP_FEATURE_SIZE,
HCI_MGMT_VAR_LEN |
HCI_MGMT_HDEV_OPTIONAL },
+ { read_adv_monitor_features, MGMT_READ_ADV_MONITOR_FEATURES_SIZE },
};

void mgmt_index_added(struct hci_dev *hdev)
diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
index d6c4e6b5ae777..8579bfeb28364 100644
--- a/net/bluetooth/msft.c
+++ b/net/bluetooth/msft.c
@@ -139,3 +139,10 @@ void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb)

bt_dev_dbg(hdev, "MSFT vendor event %u", event);
}
+
+__u64 msft_get_features(struct hci_dev *hdev)
+{
+ struct msft_data *msft = hdev->msft_data;
+
+ return msft ? msft->features : 0;
+}
diff --git a/net/bluetooth/msft.h b/net/bluetooth/msft.h
index 5aa9130e1f8ab..e9c478e890b8b 100644
--- a/net/bluetooth/msft.h
+++ b/net/bluetooth/msft.h
@@ -3,16 +3,25 @@
* Copyright (C) 2020 Google Corporation
*/

+#define MSFT_FEATURE_MASK_BREDR_RSSI_MONITOR BIT(0)
+#define MSFT_FEATURE_MASK_LE_CONN_RSSI_MONITOR BIT(1)
+#define MSFT_FEATURE_MASK_LE_ADV_RSSI_MONITOR BIT(2)
+#define MSFT_FEATURE_MASK_LE_ADV_MONITOR BIT(3)
+#define MSFT_FEATURE_MASK_CURVE_VALIDITY BIT(4)
+#define MSFT_FEATURE_MASK_CONCURRENT_ADV_MONITOR BIT(5)
+
#if IS_ENABLED(CONFIG_BT_MSFTEXT)

void msft_do_open(struct hci_dev *hdev);
void msft_do_close(struct hci_dev *hdev);
void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb);
+__u64 msft_get_features(struct hci_dev *hdev);

#else

static inline void msft_do_open(struct hci_dev *hdev) {}
static inline void msft_do_close(struct hci_dev *hdev) {}
static inline void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb) {}
+static inline __u64 msft_get_features(struct hci_dev *hdev) { return 0; }

#endif
--
2.26.2
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