Bluetooth: Support the "discoverable" adv flag

This patch adds support for the "discoverable" flag of the
Add Advertising command.

Signed-off-by: Arman Uguray <armansito@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 30 insertions, 8 deletions

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 672ff5b66c21..c1804527fa3b 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -975,13 +975,28 @@ static u8 create_default_adv_data(struct hci_dev *hdev, u8 *ptr)
 
 static u8 create_instance_adv_data(struct hci_dev *hdev, u8 *ptr)
 {
-        /* TODO: Set the appropriate entries based on advertising instance flags
-         * here once flags other than 0 are supported.
-         */
+        u8 ad_len = 0, flags = 0;
+
+        if (hdev->adv_instance.flags & MGMT_ADV_FLAG_DISCOV)
+                flags |= LE_AD_GENERAL;
+
+        if (flags) {
+                if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
+                        flags |= LE_AD_NO_BREDR;
+
+                ptr[0] = 0x02;
+                ptr[1] = EIR_FLAGS;
+                ptr[2] = flags;
+
+                ad_len += 3;
+                ptr += 3;
+        }
+
         memcpy(ptr, hdev->adv_instance.adv_data,
                hdev->adv_instance.adv_data_len);
+        ad_len += hdev->adv_instance.adv_data_len;
 
-        return hdev->adv_instance.adv_data_len;
+        return ad_len;
 }
 
 static void update_adv_data_for_instance(struct hci_request *req, u8 instance)
@@ -6556,12 +6571,16 @@ static int read_adv_features(struct sock *sk, struct hci_dev *hdev,
 }
 
 static bool tlv_data_is_valid(struct hci_dev *hdev, u32 adv_flags, u8 *data,
-                              u8 len)
+                              u8 len, bool is_adv_data)
 {
         u8 max_len = HCI_MAX_AD_LENGTH;
         int i, cur_len;
+        bool flags_managed = false;
 
-        /* TODO: Correctly reduce len based on adv_flags. */
+        if (is_adv_data && (adv_flags & MGMT_ADV_FLAG_DISCOV)) {
+                flags_managed = true;
+                max_len -= 3;
+        }
 
         if (len > max_len)
                 return false;
@@ -6570,6 +6589,9 @@ static bool tlv_data_is_valid(struct hci_dev *hdev, u32 adv_flags, u8 *data,
         for (i = 0, cur_len = 0; i < len; i += (cur_len + 1)) {
                 cur_len = data[i];
 
+                if (flags_managed && data[i + 1] == EIR_FLAGS)
+                        return false;
+
                 /* If the current field length would exceed the total data
                  * length, then it's invalid.
                  */
@@ -6671,9 +6693,9 @@ static int add_advertising(struct sock *sk, struct hci_dev *hdev,
                 goto unlock;
         }
 
-        if (!tlv_data_is_valid(hdev, flags, cp->data, cp->adv_data_len) ||
+        if (!tlv_data_is_valid(hdev, flags, cp->data, cp->adv_data_len, true) ||
             !tlv_data_is_valid(hdev, flags, cp->data + cp->adv_data_len,
-                               cp->scan_rsp_len)) {
+                               cp->scan_rsp_len, false)) {
                 err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,
                                       MGMT_STATUS_INVALID_PARAMS);
                 goto unlock;