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Date:   Fri,  9 Apr 2021 15:04:06 -0700
Message-Id: <20210409150356.v2.1.Id5ee0a2edda8f0902498aaeb1b6c78d062579b75@changeid>
Mime-Version: 1.0
Subject: [PATCH v2] Bluetooth: Return whether a connection is outbound
From:   Yu Liu <yudiliu@google.com>
To:     linux-bluetooth@vger.kernel.org, marcel@holtmann.org,
        chromeos-bluetooth-upstreaming@chromium.org
Cc:     Yu Liu <yudiliu@google.com>, Miao-chen Chou <mcchou@chromium.org>,
        Alain Michaud <alainm@chromium.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

When an MGMT_EV_DEVICE_CONNECTED event is reported back to the user
space we will set the flags to tell if the established connection is
outbound or not. This is useful for the user space to log better metrics
and error messages.

Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Yu Liu <yudiliu@google.com>
---

Changes in v2:
- Defined the bit as MGMT_DEV_FOUND_INITIATED_CONN

Changes in v1:
- Initial change

 include/net/bluetooth/hci_core.h | 2 +-
 include/net/bluetooth/mgmt.h     | 1 +
 net/bluetooth/hci_event.c        | 8 ++++----
 net/bluetooth/l2cap_core.c       | 2 +-
 net/bluetooth/mgmt.c             | 6 +++++-
 5 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index ca4ac6603b9a..d2876b758770 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1756,7 +1756,7 @@ void __mgmt_power_off(struct hci_dev *hdev);
 void mgmt_new_link_key(struct hci_dev *hdev, struct link_key *key,
 		       bool persistent);
 void mgmt_device_connected(struct hci_dev *hdev, struct hci_conn *conn,
-			   u32 flags, u8 *name, u8 name_len);
+			   u8 *name, u8 name_len);
 void mgmt_device_disconnected(struct hci_dev *hdev, bdaddr_t *bdaddr,
 			      u8 link_type, u8 addr_type, u8 reason,
 			      bool mgmt_connected);
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index a7cffb069565..a03c62b1dc2f 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -939,6 +939,7 @@ struct mgmt_ev_auth_failed {
 #define MGMT_DEV_FOUND_CONFIRM_NAME    0x01
 #define MGMT_DEV_FOUND_LEGACY_PAIRING  0x02
 #define MGMT_DEV_FOUND_NOT_CONNECTABLE 0x04
+#define MGMT_DEV_FOUND_INITIATED_CONN  0x08
 
 #define MGMT_EV_DEVICE_FOUND		0x0012
 struct mgmt_ev_device_found {
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 593eafa282e3..35b1adb2287c 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2071,7 +2071,7 @@ static void hci_check_pending_name(struct hci_dev *hdev, struct hci_conn *conn,
 	if (conn &&
 	    (conn->state == BT_CONFIG || conn->state == BT_CONNECTED) &&
 	    !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &conn->flags))
-		mgmt_device_connected(hdev, conn, 0, name, name_len);
+		mgmt_device_connected(hdev, conn, name, name_len);
 
 	if (discov->state == DISCOVERY_STOPPED)
 		return;
@@ -3258,7 +3258,7 @@ static void hci_remote_features_evt(struct hci_dev *hdev,
 		cp.pscan_rep_mode = 0x02;
 		hci_send_cmd(hdev, HCI_OP_REMOTE_NAME_REQ, sizeof(cp), &cp);
 	} else if (!test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &conn->flags))
-		mgmt_device_connected(hdev, conn, 0, NULL, 0);
+		mgmt_device_connected(hdev, conn, NULL, 0);
 
 	if (!hci_outgoing_auth_needed(hdev, conn)) {
 		conn->state = BT_CONNECTED;
@@ -4332,7 +4332,7 @@ static void hci_remote_ext_features_evt(struct hci_dev *hdev,
 		cp.pscan_rep_mode = 0x02;
 		hci_send_cmd(hdev, HCI_OP_REMOTE_NAME_REQ, sizeof(cp), &cp);
 	} else if (!test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &conn->flags))
-		mgmt_device_connected(hdev, conn, 0, NULL, 0);
+		mgmt_device_connected(hdev, conn, NULL, 0);
 
 	if (!hci_outgoing_auth_needed(hdev, conn)) {
 		conn->state = BT_CONNECTED;
@@ -5206,7 +5206,7 @@ static void le_conn_complete_evt(struct hci_dev *hdev, u8 status,
 	}
 
 	if (!test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &conn->flags))
-		mgmt_device_connected(hdev, conn, 0, NULL, 0);
+		mgmt_device_connected(hdev, conn, NULL, 0);
 
 	conn->sec_level = BT_SECURITY_LOW;
 	conn->handle = handle;
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 140669456b6f..821d46ba6e74 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -4237,7 +4237,7 @@ static int l2cap_connect_req(struct l2cap_conn *conn,
 	hci_dev_lock(hdev);
 	if (hci_dev_test_flag(hdev, HCI_MGMT) &&
 	    !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
-		mgmt_device_connected(hdev, hcon, 0, NULL, 0);
+		mgmt_device_connected(hdev, hcon, NULL, 0);
 	hci_dev_unlock(hdev);
 
 	l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 09e099c419f2..c594e0c2dd23 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -8765,15 +8765,19 @@ void mgmt_new_conn_param(struct hci_dev *hdev, bdaddr_t *bdaddr,
 }
 
 void mgmt_device_connected(struct hci_dev *hdev, struct hci_conn *conn,
-			   u32 flags, u8 *name, u8 name_len)
+			   u8 *name, u8 name_len)
 {
 	char buf[512];
 	struct mgmt_ev_device_connected *ev = (void *) buf;
 	u16 eir_len = 0;
+	u32 flags = 0;
 
 	bacpy(&ev->addr.bdaddr, &conn->dst);
 	ev->addr.type = link_to_bdaddr(conn->type, conn->dst_type);
 
+	if (conn->out)
+		flags |= MGMT_DEV_FOUND_INITIATED_CONN;
+
 	ev->flags = __cpu_to_le32(flags);
 
 	/* We must ensure that the EIR Data fields are ordered and
-- 
2.31.1.295.g9ea45b61b8-goog