Bluetooth: Add support for LE ping feature

Changes made to add HCI Write Authenticated Payload timeout
command for LE Ping feature.

As per the Core Specification 5.0 Volume 2 Part E Section 7.3.94,
the following code changes implements
HCI Write Authenticated Payload timeout command for LE Ping feature.

Signed-off-by: Spoorthi Ravishankar Koppad <spoorthix.k@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

4 files changed, 107 insertions, 0 deletions

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 15d1cb5aee18..17e5111daa11 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -520,6 +520,9 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 	set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 	conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 
+	/* Set Default Authenticated payload timeout to 30s */
+	conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
+
 	if (conn->role == HCI_ROLE_MASTER)
 		conn->out = true;
 
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index b81bf53c5ac4..ff9a755f4df3 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3200,6 +3200,7 @@ struct hci_dev *hci_alloc_dev(void)
 	hdev->discov_interleaved_timeout = DISCOV_INTERLEAVED_TIMEOUT;
 	hdev->conn_info_min_age = DEFAULT_CONN_INFO_MIN_AGE;
 	hdev->conn_info_max_age = DEFAULT_CONN_INFO_MAX_AGE;
+	hdev->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
 
 	mutex_init(&hdev->lock);
 	mutex_init(&hdev->req_lock);
diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c
index 51f5b1efc3a5..bb67f4a5479a 100644
--- a/net/bluetooth/hci_debugfs.c
+++ b/net/bluetooth/hci_debugfs.c
@@ -941,6 +941,35 @@ static int adv_max_interval_get(void *data, u64 *val)
 DEFINE_SIMPLE_ATTRIBUTE(adv_max_interval_fops, adv_max_interval_get,
 			adv_max_interval_set, "%llu\n");
 
+static int auth_payload_timeout_set(void *data, u64 val)
+{
+	struct hci_dev *hdev = data;
+
+	if (val < 0x0001 || val > 0xffff)
+		return -EINVAL;
+
+	hci_dev_lock(hdev);
+	hdev->auth_payload_timeout = val;
+	hci_dev_unlock(hdev);
+
+	return 0;
+}
+
+static int auth_payload_timeout_get(void *data, u64 *val)
+{
+	struct hci_dev *hdev = data;
+
+	hci_dev_lock(hdev);
+	*val = hdev->auth_payload_timeout;
+	hci_dev_unlock(hdev);
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(auth_payload_timeout_fops,
+			auth_payload_timeout_get,
+			auth_payload_timeout_set, "%llu\n");
+
 DEFINE_QUIRK_ATTRIBUTE(quirk_strict_duplicate_filter,
 		       HCI_QUIRK_STRICT_DUPLICATE_FILTER);
 DEFINE_QUIRK_ATTRIBUTE(quirk_simultaneous_discovery,
@@ -994,6 +1023,8 @@ void hci_debugfs_create_le(struct hci_dev *hdev)
 			    &adv_max_interval_fops);
 	debugfs_create_u16("discov_interleaved_timeout", 0644, hdev->debugfs,
 			   &hdev->discov_interleaved_timeout);
+	debugfs_create_file("auth_payload_timeout", 0644, hdev->debugfs, hdev,
+			    &auth_payload_timeout_fops);
 
 	debugfs_create_file("quirk_strict_duplicate_filter", 0644,
 			    hdev->debugfs, hdev,
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 9e4fcf406d9c..c1d3a303d97f 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -579,6 +579,51 @@ static void hci_cc_read_local_commands(struct hci_dev *hdev,
 		memcpy(hdev->commands, rp->commands, sizeof(hdev->commands));
 }
 
+static void hci_cc_read_auth_payload_timeout(struct hci_dev *hdev,
+					     struct sk_buff *skb)
+{
+	struct hci_rp_read_auth_payload_to *rp = (void *)skb->data;
+	struct hci_conn *conn;
+
+	BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
+
+	if (rp->status)
+		return;
+
+	hci_dev_lock(hdev);
+
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(rp->handle));
+	if (conn)
+		conn->auth_payload_timeout = __le16_to_cpu(rp->timeout);
+
+	hci_dev_unlock(hdev);
+}
+
+static void hci_cc_write_auth_payload_timeout(struct hci_dev *hdev,
+					      struct sk_buff *skb)
+{
+	struct hci_rp_write_auth_payload_to *rp = (void *)skb->data;
+	struct hci_conn *conn;
+	void *sent;
+
+	BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
+
+	if (rp->status)
+		return;
+
+	sent = hci_sent_cmd_data(hdev, HCI_OP_WRITE_AUTH_PAYLOAD_TO);
+	if (!sent)
+		return;
+
+	hci_dev_lock(hdev);
+
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(rp->handle));
+	if (conn)
+		conn->auth_payload_timeout = get_unaligned_le16(sent + 2);
+
+	hci_dev_unlock(hdev);
+}
+
 static void hci_cc_read_local_features(struct hci_dev *hdev,
 				       struct sk_buff *skb)
 {
@@ -2975,6 +3020,25 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		goto unlock;
 	}
 
+	/* Set the default Authenticated Payload Timeout after
+	 * an LE Link is established. As per Core Spec v5.0, Vol 2, Part B
+	 * Section 3.3, the HCI command WRITE_AUTH_PAYLOAD_TIMEOUT should be
+	 * sent when the link is active and Encryption is enabled, the conn
+	 * type can be either LE or ACL and controller must support LMP Ping.
+	 * Ensure for AES-CCM encryption as well.
+	 */
+	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags) &&
+	    test_bit(HCI_CONN_AES_CCM, &conn->flags) &&
+	    ((conn->type == ACL_LINK && lmp_ping_capable(hdev)) ||
+	     (conn->type == LE_LINK && (hdev->le_features[0] & HCI_LE_PING)))) {
+		struct hci_cp_write_auth_payload_to cp;
+
+		cp.handle = cpu_to_le16(conn->handle);
+		cp.timeout = cpu_to_le16(hdev->auth_payload_timeout);
+		hci_send_cmd(conn->hdev, HCI_OP_WRITE_AUTH_PAYLOAD_TO,
+			     sizeof(cp), &cp);
+	}
+
 notify:
 	if (conn->state == BT_CONFIG) {
 		if (!ev->status)
@@ -3170,6 +3234,14 @@ static void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *skb,
 		hci_cc_write_sc_support(hdev, skb);
 		break;
 
+	case HCI_OP_READ_AUTH_PAYLOAD_TO:
+		hci_cc_read_auth_payload_timeout(hdev, skb);
+		break;
+
+	case HCI_OP_WRITE_AUTH_PAYLOAD_TO:
+		hci_cc_write_auth_payload_timeout(hdev, skb);
+		break;
+
 	case HCI_OP_READ_LOCAL_VERSION:
 		hci_cc_read_local_version(hdev, skb);
 		break;