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Bluetooth: Read LE remote features during connection establishment 

When establishing a Bluetooth LE connection, read the remote used
features mask to determine which features are supported. This was
not really needed with Bluetooth 4.0, but since Bluetooth 4.1 and
also 4.2 have introduced new optional features, this becomes more
important.

This works the same as with BR/EDR where the connection enters the
BT_CONFIG stage and hci_connect_cfm call is delayed until the remote
features have been retrieved. Only after successfully receiving the
remote features, the connection enters the BT_CONNECTED state.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2015-04-08 09:05:27 -07:00 committed by Johan Hedberg
parent 40f66c05c3
commit 0fe29fd1cd
2 changed files with 118 additions and 2 deletions
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13
include/net/bluetooth/hci.h
View File

@ -374,6 +374,7 @@ enum {
/* LE features */
#define HCI_LE_ENCRYPTION 0x01
#define HCI_LE_CONN_PARAM_REQ_PROC 0x02
#define HCI_LE_SLAVE_FEATURES 0x08
#define HCI_LE_PING 0x10
#define HCI_LE_DATA_LEN_EXT 0x20
#define HCI_LE_EXT_SCAN_POLICY 0x80
@ -1376,6 +1377,11 @@ struct hci_cp_le_conn_update {
__le16 max_ce_len;
} __packed;
#define HCI_OP_LE_READ_REMOTE_FEATURES 0x2016
struct hci_cp_le_read_remote_features {
__le16 handle;
} __packed;
#define HCI_OP_LE_START_ENC 0x2019
struct hci_cp_le_start_enc {
__le16 handle;
@ -1868,6 +1874,13 @@ struct hci_ev_le_conn_update_complete {
__le16 supervision_timeout;
} __packed;
#define HCI_EV_LE_REMOTE_FEAT_COMPLETE 0x04
struct hci_ev_le_remote_feat_complete {
__u8 status;
__le16 handle;
__u8 features[8];
} __packed;
#define HCI_EV_LE_LTK_REQ 0x05
struct hci_ev_le_ltk_req {
__le16 handle;

107
net/bluetooth/hci_event.c
View File

@ -2036,6 +2036,33 @@ unlock:
hci_dev_unlock(hdev);
}
static void hci_cs_le_read_remote_features(struct hci_dev *hdev, u8 status)
{
struct hci_cp_le_read_remote_features *cp;
struct hci_conn *conn;
BT_DBG("%s status 0x%2.2x", hdev->name, status);
if (!status)
return;
cp = hci_sent_cmd_data(hdev, HCI_OP_LE_READ_REMOTE_FEATURES);
if (!cp)
return;
hci_dev_lock(hdev);
conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(cp->handle));
if (conn) {
if (conn->state == BT_CONFIG) {
hci_connect_cfm(conn, status);
hci_conn_drop(conn);
}
}
hci_dev_unlock(hdev);
}
static void hci_cs_le_start_enc(struct hci_dev *hdev, u8 status)
{
struct hci_cp_le_start_enc *cp;
@ -3104,6 +3131,10 @@ static void hci_cmd_status_evt(struct hci_dev *hdev, struct sk_buff *skb,
hci_cs_le_create_conn(hdev, ev->status);
break;
case HCI_OP_LE_READ_REMOTE_FEATURES:
hci_cs_le_read_remote_features(hdev, ev->status);
break;
case HCI_OP_LE_START_ENC:
hci_cs_le_start_enc(hdev, ev->status);
break;
@ -4515,7 +4546,7 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
conn->sec_level = BT_SECURITY_LOW;
conn->handle = __le16_to_cpu(ev->handle);
conn->state = BT_CONNECTED;
conn->state = BT_CONFIG;
conn->le_conn_interval = le16_to_cpu(ev->interval);
conn->le_conn_latency = le16_to_cpu(ev->latency);
@ -4524,7 +4555,33 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
hci_debugfs_create_conn(conn);
hci_conn_add_sysfs(conn);
hci_connect_cfm(conn, ev->status);
if (!ev->status) {
/* The remote features procedure is defined for master
* role only. So only in case of an initiated connection
* request the remote features.
*
* If the local controller supports slave-initiated features
* exchange, then requesting the remote features in slave
* role is possible. Otherwise just transition into the
* connected state without requesting the remote features.
*/
if (conn->out ||
(hdev->le_features[0] & HCI_LE_SLAVE_FEATURES)) {
struct hci_cp_le_read_remote_features cp;
cp.handle = __cpu_to_le16(conn->handle);
hci_send_cmd(hdev, HCI_OP_LE_READ_REMOTE_FEATURES,
sizeof(cp), &cp);
hci_conn_hold(conn);
} else {
conn->state = BT_CONNECTED;
hci_connect_cfm(conn, ev->status);
}
} else {
hci_connect_cfm(conn, ev->status);
}
params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
conn->dst_type);
@ -4826,6 +4883,48 @@ static void hci_le_adv_report_evt(struct hci_dev *hdev, struct sk_buff *skb)
hci_dev_unlock(hdev);
}
static void hci_le_remote_feat_complete_evt(struct hci_dev *hdev,
struct sk_buff *skb)
{
struct hci_ev_le_remote_feat_complete *ev = (void *)skb->data;
struct hci_conn *conn;
BT_DBG("%s status 0x%2.2x", hdev->name, ev->status);
hci_dev_lock(hdev);
conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
if (conn) {
if (!ev->status)
memcpy(conn->features[0], ev->features, 8);
if (conn->state == BT_CONFIG) {
__u8 status;
/* If the local controller supports slave-initiated
* features exchange, but the remote controller does
* not, then it is possible that the error code 0x1a
* for unsupported remote feature gets returned.
*
* In this specific case, allow the connection to
* transition into connected state and mark it as
* successful.
*/
if ((hdev->le_features[0] & HCI_LE_SLAVE_FEATURES) &&
!conn->out && ev->status == 0x1a)
status = 0x00;
else
status = ev->status;
conn->state = BT_CONNECTED;
hci_connect_cfm(conn, status);
hci_conn_drop(conn);
}
}
hci_dev_unlock(hdev);
}
static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_ev_le_ltk_req *ev = (void *) skb->data;
@ -4999,6 +5098,10 @@ static void hci_le_meta_evt(struct hci_dev *hdev, struct sk_buff *skb)
hci_le_adv_report_evt(hdev, skb);
break;
case HCI_EV_LE_REMOTE_FEAT_COMPLETE:
hci_le_remote_feat_complete_evt(hdev, skb);
break;
case HCI_EV_LE_LTK_REQ:
hci_le_ltk_request_evt(hdev, skb);
break;