Bluetooth: mgmt: Add support for setting the local name

This patch adds a new set_local_name management command as well as a
local_name_changed management event. With these user space can both
change the local name as well as monitor changes to it by others.

Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/hci_core.h

@@ -767,6 +767,7 @@ int mgmt_user_confirm_reply_complete(u16 index, bdaddr_t *bdaddr, u8 status);
 int mgmt_user_confirm_neg_reply_complete(u16 index, bdaddr_t *bdaddr,
 								u8 status);
 int mgmt_auth_failed(u16 index, bdaddr_t *bdaddr, u8 status);
+int mgmt_set_local_name_complete(u16 index, u8 *name, u8 status);
 
 /* HCI info for socket */
 #define hci_pi(sk) ((struct hci_pinfo *) sk)

include/net/bluetooth/mgmt.h

@@ -172,6 +172,11 @@ struct mgmt_rp_user_confirm_reply {
 
 #define MGMT_OP_USER_CONFIRM_NEG_REPLY	0x0016
 
+#define MGMT_OP_SET_LOCAL_NAME		0x0017
+struct mgmt_cp_set_local_name {
+	__u8 name[MGMT_MAX_NAME_LENGTH];
+} __packed;
+
 #define MGMT_EV_CMD_COMPLETE		0x0001
 struct mgmt_ev_cmd_complete {
 	__le16 opcode;
@@ -239,3 +244,8 @@ struct mgmt_ev_auth_failed {
 	bdaddr_t bdaddr;
 	__u8 status;
 } __packed;
+
+#define MGMT_EV_LOCAL_NAME_CHANGED	0x0011
+struct mgmt_ev_local_name_changed {
+	__u8 name[MGMT_MAX_NAME_LENGTH];
+} __packed;

net/bluetooth/hci_event.c

@@ -193,13 +193,16 @@ static void hci_cc_write_local_name(struct hci_dev *hdev, struct sk_buff *skb)
 
 	BT_DBG("%s status 0x%x", hdev->name, status);
 
-	if (status)
-		return;
-
 	sent = hci_sent_cmd_data(hdev, HCI_OP_WRITE_LOCAL_NAME);
 	if (!sent)
 		return;
 
+	if (test_bit(HCI_MGMT, &hdev->flags))
+		mgmt_set_local_name_complete(hdev->id, sent, status);
+
+	if (status)
+		return;
+
 	memcpy(hdev->dev_name, sent, HCI_MAX_NAME_LENGTH);
 }
 

net/bluetooth/mgmt.c

@@ -1256,6 +1256,45 @@ failed:
 	return err;
 }
 
+static int set_local_name(struct sock *sk, u16 index, unsigned char *data,
+								u16 len)
+{
+	struct mgmt_cp_set_local_name *mgmt_cp = (void *) data;
+	struct hci_cp_write_local_name hci_cp;
+	struct hci_dev *hdev;
+	struct pending_cmd *cmd;
+	int err;
+
+	BT_DBG("");
+
+	if (len != sizeof(*mgmt_cp))
+		return cmd_status(sk, index, MGMT_OP_SET_LOCAL_NAME, EINVAL);
+
+	hdev = hci_dev_get(index);
+	if (!hdev)
+		return cmd_status(sk, index, MGMT_OP_SET_LOCAL_NAME, ENODEV);
+
+	hci_dev_lock_bh(hdev);
+
+	cmd = mgmt_pending_add(sk, MGMT_OP_SET_LOCAL_NAME, index, data, len);
+	if (!cmd) {
+		err = -ENOMEM;
+		goto failed;
+	}
+
+	memcpy(hci_cp.name, mgmt_cp->name, sizeof(hci_cp.name));
+	err = hci_send_cmd(hdev, HCI_OP_WRITE_LOCAL_NAME, sizeof(hci_cp),
+								&hci_cp);
+	if (err < 0)
+		mgmt_pending_remove(cmd);
+
+failed:
+	hci_dev_unlock_bh(hdev);
+	hci_dev_put(hdev);
+
+	return err;
+}
+
 int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
 {
 	unsigned char *buf;
@@ -1351,6 +1390,9 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
 	case MGMT_OP_USER_CONFIRM_NEG_REPLY:
 		err = user_confirm_reply(sk, index, buf + sizeof(*hdr), len, 0);
 		break;
+	case MGMT_OP_SET_LOCAL_NAME:
+		err = set_local_name(sk, index, buf + sizeof(*hdr), len);
+		break;
 	default:
 		BT_DBG("Unknown op %u", opcode);
 		err = cmd_status(sk, index, opcode, 0x01);
@@ -1647,3 +1689,36 @@ int mgmt_auth_failed(u16 index, bdaddr_t *bdaddr, u8 status)
 
 	return mgmt_event(MGMT_EV_AUTH_FAILED, index, &ev, sizeof(ev), NULL);
 }
+
+int mgmt_set_local_name_complete(u16 index, u8 *name, u8 status)
+{
+	struct pending_cmd *cmd;
+	struct mgmt_cp_set_local_name ev;
+	int err;
+
+	memset(&ev, 0, sizeof(ev));
+	memcpy(ev.name, name, HCI_MAX_NAME_LENGTH);
+
+	cmd = mgmt_pending_find(MGMT_OP_SET_LOCAL_NAME, index);
+	if (!cmd)
+		goto send_event;
+
+	if (status) {
+		err = cmd_status(cmd->sk, index, MGMT_OP_SET_LOCAL_NAME, EIO);
+		goto failed;
+	}
+
+	err = cmd_complete(cmd->sk, index, MGMT_OP_SET_LOCAL_NAME, &ev,
+								sizeof(ev));
+	if (err < 0)
+		goto failed;
+
+send_event:
+	err = mgmt_event(MGMT_EV_LOCAL_NAME_CHANGED, index, &ev, sizeof(ev),
+							cmd ? cmd->sk : NULL);
+
+failed:
+	if (cmd)
+		mgmt_pending_remove(cmd);
+	return err;
+}