In case of connected hosts that doesn't support the Connection
Parameters Request Link Layer Control Procedure, we should support this
event response from a slave device.
The slave device will answer based on a previous request done by the
master (BlueZ in this case) and update current connection parameters
accordingly. If the request was rejected, we don't do anything.
Signed-off-by: Felipe F. Tonello <eu@xxxxxxxxxxxxxxxxx>
---
include/net/bluetooth/l2cap.h | 2 ++
net/bluetooth/l2cap_core.c | 45 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 0073a01c61e9..eb58d811596f 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -654,6 +654,8 @@ struct l2cap_conn {
struct mutex chan_lock;
struct kref ref;
struct list_head users;
+
+ struct l2cap_conn_param_update_req conn_param_req;
};
struct l2cap_user {
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 27a38b4543e1..b7c34eb4e912 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1489,6 +1489,13 @@ void l2cap_le_conn_update_req(struct l2cap_conn *conn, u8 min_interval,
{
struct l2cap_conn_param_update_req req;
+ /* set temporary parameters in case of a successful
+ * response from the peer device */
+ conn->conn_param_req.min = min_interval;
+ conn->conn_param_req.max = max_interval;
+ conn->conn_param_req.latency = latency;
+ conn->conn_param_req.to_multiplier = supv_timeout;
+
req.min = cpu_to_le16(min_interval);
req.max = cpu_to_le16(max_interval);
req.latency = cpu_to_le16(latency);
@@ -5251,6 +5258,43 @@ static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
return 0;
}
+static inline int l2cap_conn_param_update_rsp(struct l2cap_conn *conn,
+ struct l2cap_cmd_hdr *cmd,
+ u16 cmd_len, u8 *data)
+{
+ struct hci_conn *hcon = conn->hcon;
+ struct l2cap_conn_param_update_rsp *rsp;
+ u8 result;
+
+ if (hcon->role != HCI_ROLE_SLAVE)
+ return -EINVAL;
+
+ if (cmd_len != sizeof(struct l2cap_conn_param_update_rsp))
+ return -EPROTO;
+
+ rsp = (struct l2cap_conn_param_update_rsp *) data;
+ result = le16_to_cpu(rsp->result);
+
+ BT_DBG("result 0x%4.4x", result);
+
+ if (result == 0) {
+ u8 store_hint;
+
+ store_hint = hci_le_conn_update(hcon,
+ conn->conn_param_req.min,
+ conn->conn_param_req.max,
+ conn->conn_param_req.latency,
+ conn->conn_param_req.to_multiplier);
+ mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
+ store_hint, conn->conn_param_req.min,
+ conn->conn_param_req.max,
+ conn->conn_param_req.latency,
+ conn->conn_param_req.to_multiplier);
+ }
+
+ return 0;
+}
+
static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
struct l2cap_cmd_hdr *cmd, u16 cmd_len,
u8 *data)
@@ -5633,6 +5677,7 @@ static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
break;
case L2CAP_CONN_PARAM_UPDATE_RSP:
+ err = l2cap_conn_param_update_rsp(conn, cmd, cmd_len, data);
break;
case L2CAP_LE_CONN_RSP:
--
2.12.0
--
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