Bluetooth: Add simple version of Read Advertising Features command

This adds support for the simplest possible version of Read Advertising
Features management command. It allows basic testing of the interface.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

2 files changed, 47 insertions, 0 deletions

diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index f3baad589db0..4d0ccd194c01 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -517,6 +517,17 @@ struct mgmt_rp_read_ext_index_list {
         } entry[0];
 } __packed;
 
+#define MGMT_OP_READ_ADV_FEATURES       0x0003D
+#define MGMT_READ_ADV_FEATURES_SIZE     0
+struct mgmt_rp_read_adv_features {
+        __le32 supported_flags;
+        __u8   max_adv_data_len;
+        __u8   max_scan_rsp_len;
+        __u8   max_instances;
+        __u8   num_instances;
+        __u8   instance[0];
+} __packed;
+
 #define MGMT_EV_CMD_COMPLETE            0x0001
 struct mgmt_ev_cmd_complete {
         __le16  opcode;
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index fa5654d89702..25a687c2a112 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -97,6 +97,7 @@ static const u16 mgmt_commands[] = {
         MGMT_OP_SET_PUBLIC_ADDRESS,
         MGMT_OP_START_SERVICE_DISCOVERY,
         MGMT_OP_READ_EXT_INDEX_LIST,
+        MGMT_OP_READ_ADV_FEATURES,
 };
 
 static const u16 mgmt_events[] = {
@@ -6254,6 +6255,40 @@ unlock:
         return err;
 }
 
+static int read_adv_features(struct sock *sk, struct hci_dev *hdev,
+                             void *data, u16 data_len)
+{
+        struct mgmt_rp_read_adv_features *rp;
+        size_t rp_len;
+        int err;
+
+        BT_DBG("%s", hdev->name);
+
+        hci_dev_lock(hdev);
+
+        rp_len = sizeof(*rp);
+        rp = kmalloc(rp_len, GFP_ATOMIC);
+        if (!rp) {
+                hci_dev_unlock(hdev);
+                return -ENOMEM;
+        }
+
+        rp->supported_flags = cpu_to_le32(0);
+        rp->max_adv_data_len = 31;
+        rp->max_scan_rsp_len = 31;
+        rp->max_instances = 0;
+        rp->num_instances = 0;
+
+        hci_dev_unlock(hdev);
+
+        err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_READ_ADV_FEATURES,
+                                MGMT_STATUS_SUCCESS, rp, rp_len);
+
+        kfree(rp);
+
+        return err;
+}
+
 static const struct hci_mgmt_handler mgmt_handlers[] = {
         { NULL }, /* 0x0000 (no command) */
         { read_version,            MGMT_READ_VERSION_SIZE,
@@ -6337,6 +6372,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
         { read_ext_index_list,     MGMT_READ_EXT_INDEX_LIST_SIZE,
                                                 HCI_MGMT_NO_HDEV |
                                                 HCI_MGMT_UNTRUSTED },
+        { read_adv_features,       MGMT_READ_ADV_FEATURES_SIZE },
 };
 
 int mgmt_control(struct hci_mgmt_chan *chan, struct sock *sk,