linux-kernel - [PATCH v3 1/5] Bluetooth: Add helper to set adv data

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Message-Id: <20200924173752.v3.1.I5f4fa6a76fe81f977f78f06b7e68ff1c76c6bddf@changeid>
Date:   Thu, 24 Sep 2020 17:40:03 -0700
From:   Daniel Winkler <danielwinkler@...gle.com>
To:     marcel@...tmann.org
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        linux-bluetooth@...r.kernel.org,
        Daniel Winkler <danielwinkler@...gle.com>,
        Sonny Sasaka <sonnysasaka@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v3 1/5] Bluetooth: Add helper to set adv data

We wish to handle advertising data separately from advertising
parameters in our new MGMT requests. This change adds a helper that
allows the advertising data and scan response to be updated for an
existing advertising instance.

Reviewed-by: Sonny Sasaka <sonnysasaka@...omium.org>
Signed-off-by: Daniel Winkler <danielwinkler@...gle.com>
---

Changes in v3: None
Changes in v2: None

 include/net/bluetooth/hci_core.h |  3 +++
 net/bluetooth/hci_core.c         | 31 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 9873e1c8cd163b..300b3572d479e1 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1291,6 +1291,9 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
 			 u16 adv_data_len, u8 *adv_data,
 			 u16 scan_rsp_len, u8 *scan_rsp_data,
 			 u16 timeout, u16 duration);
+int hci_set_adv_instance_data(struct hci_dev *hdev, u8 instance,
+			 u16 adv_data_len, u8 *adv_data,
+			 u16 scan_rsp_len, u8 *scan_rsp_data);
 int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance);
 void hci_adv_instances_set_rpa_expired(struct hci_dev *hdev, bool rpa_expired);
 
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 8a2645a8330137..3f73f147826409 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3005,6 +3005,37 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
 	return 0;
 }
 
+/* This function requires the caller holds hdev->lock */
+int hci_set_adv_instance_data(struct hci_dev *hdev, u8 instance,
+			      u16 adv_data_len, u8 *adv_data,
+			      u16 scan_rsp_len, u8 *scan_rsp_data)
+{
+	struct adv_info *adv_instance;
+
+	adv_instance = hci_find_adv_instance(hdev, instance);
+
+	/* If advertisement doesn't exist, we can't modify its data */
+	if (!adv_instance)
+		return -ENOENT;
+
+	if (adv_data_len) {
+		memset(adv_instance->adv_data, 0,
+		       sizeof(adv_instance->adv_data));
+		memcpy(adv_instance->adv_data, adv_data, adv_data_len);
+		adv_instance->adv_data_len = adv_data_len;
+	}
+
+	if (scan_rsp_len) {
+		memset(adv_instance->scan_rsp_data, 0,
+		       sizeof(adv_instance->scan_rsp_data));
+		memcpy(adv_instance->scan_rsp_data,
+		       scan_rsp_data, scan_rsp_len);
+		adv_instance->scan_rsp_len = scan_rsp_len;
+	}
+
+	return 0;
+}
+
 /* This function requires the caller holds hdev->lock */
 void hci_adv_monitors_clear(struct hci_dev *hdev)
 {
-- 
2.28.0.709.gb0816b6eb0-goog