Bluetooth: Add support to get connection information

This patch adds support for Get Connection Information mgmt command
which can be used to query for information about connection, i.e. RSSI
and local TX power level.

In general values cached in hci_conn are returned as long as they are
considered valid, i.e. do not exceed age limit set in hdev. This limit
is calculated as random value between min/max values to avoid client
trying to guess when to poll for updated information.

Signed-off-by: Andrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 14 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 4623f45c8892..cbbab6327621 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -384,6 +384,8 @@ struct hci_conn {
         __s8            tx_power;
         unsigned long   flags;
 
+        unsigned long   conn_info_timestamp;
+
         __u8            remote_cap;
         __u8            remote_auth;
         __u8            remote_id;
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index d4b571c2f9fd..226ae03cafe7 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -409,6 +409,18 @@ struct mgmt_cp_load_irks {
 } __packed;
 #define MGMT_LOAD_IRKS_SIZE             2
 
+#define MGMT_OP_GET_CONN_INFO           0x0031
+struct mgmt_cp_get_conn_info {
+        struct mgmt_addr_info addr;
+} __packed;
+#define MGMT_GET_CONN_INFO_SIZE         MGMT_ADDR_INFO_SIZE
+struct mgmt_rp_get_conn_info {
+        struct mgmt_addr_info addr;
+        __s8    rssi;
+        __s8    tx_power;
+        __s8    max_tx_power;
+} __packed;
+
 #define MGMT_EV_CMD_COMPLETE            0x0001
 struct mgmt_ev_cmd_complete {
         __le16  opcode;