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Bluetooth: MGMT: Add initial implementation of MGMT_OP_HCI_CMD_SYNC

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This adds the initial implementation of MGMT_OP_HCI_CMD_SYNC as
documented in mgmt-api (BlueZ tree):

Send HCI command and wait for event Command
===========================================

	Command Code:		0x005B
	Controller Index:	<controller id>
	Command Parameters:	Opcode (2 Octets)
				Event (1 Octet)
				Timeout (1 Octet)
				Parameter Length (2 Octets)
				Parameter (variable)
	Return Parameters:	Response (1-variable Octets)

	This command may be used to send a HCI command and wait for an
	(optional) event.

	The HCI command is specified by the Opcode, any arbitrary is supported
	including vendor commands, but contrary to the like of
	Raw/User channel it is run as an HCI command send by the kernel
	since it uses its command synchronization thus it is possible to wait
	for a specific event as a response.

	Setting event to 0x00 will cause the command to wait for either
	HCI Command Status or HCI Command Complete.

	Timeout is specified in seconds, setting it to 0 will cause the
	default timeout to be used.

	Possible errors:	Failed
				Invalid Parameters

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2024-10-23 16:55:57 -04:00
parent 27aabf27fd
commit 827af4787e
2 changed files with 70 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

10
include/net/bluetooth/mgmt.h
View file

@ -878,6 +878,16 @@ struct mgmt_cp_mesh_send_cancel {
} __packed;
#define MGMT_MESH_SEND_CANCEL_SIZE 1
#define MGMT_OP_HCI_CMD_SYNC 0x005B
struct mgmt_cp_hci_cmd_sync {
__le16 opcode;
__u8 event;
__u8 timeout;
__le16 params_len;
__u8 params[];
} __packed;
#define MGMT_HCI_CMD_SYNC_SIZE 6
#define MGMT_EV_CMD_COMPLETE 0x0001
struct mgmt_ev_cmd_complete {
__le16 opcode;

60
net/bluetooth/mgmt.c
View file

@ -132,6 +132,7 @@ static const u16 mgmt_commands[] = {
MGMT_OP_MESH_READ_FEATURES,
MGMT_OP_MESH_SEND,
MGMT_OP_MESH_SEND_CANCEL,
MGMT_OP_HCI_CMD_SYNC,
};
static const u16 mgmt_events[] = {
@ -2515,6 +2516,64 @@ static int set_le(struct sock *sk, struct hci_dev *hdev, void *data, u16 len)
return err;
}
static int send_hci_cmd_sync(struct hci_dev *hdev, void *data)
{
struct mgmt_pending_cmd *cmd = data;
struct mgmt_cp_hci_cmd_sync *cp = cmd->param;
struct sk_buff *skb;
skb = __hci_cmd_sync_ev(hdev, le16_to_cpu(cp->opcode),
le16_to_cpu(cp->params_len), cp->params,
cp->event, cp->timeout ?
msecs_to_jiffies(cp->timeout * 1000) :
HCI_CMD_TIMEOUT);
if (IS_ERR(skb)) {
mgmt_cmd_status(cmd->sk, hdev->id, MGMT_OP_HCI_CMD_SYNC,
mgmt_status(PTR_ERR(skb)));
goto done;
}
mgmt_cmd_complete(cmd->sk, hdev->id, MGMT_OP_HCI_CMD_SYNC, 0,
skb->data, skb->len);
kfree_skb(skb);
done:
mgmt_pending_free(cmd);
return 0;
}
static int mgmt_hci_cmd_sync(struct sock *sk, struct hci_dev *hdev,
void *data, u16 len)
{
struct mgmt_cp_hci_cmd_sync *cp = data;
struct mgmt_pending_cmd *cmd;
int err;
if (len < sizeof(*cp))
return mgmt_cmd_status(sk, hdev->id, MGMT_OP_HCI_CMD_SYNC,
MGMT_STATUS_INVALID_PARAMS);
hci_dev_lock(hdev);
cmd = mgmt_pending_new(sk, MGMT_OP_HCI_CMD_SYNC, hdev, data, len);
if (!cmd)
err = -ENOMEM;
else
err = hci_cmd_sync_queue(hdev, send_hci_cmd_sync, cmd, NULL);
if (err < 0) {
err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_HCI_CMD_SYNC,
MGMT_STATUS_FAILED);
if (cmd)
mgmt_pending_free(cmd);
}
hci_dev_unlock(hdev);
return err;
}
/* This is a helper function to test for pending mgmt commands that can
* cause CoD or EIR HCI commands. We can only allow one such pending
* mgmt command at a time since otherwise we cannot easily track what
@ -9371,6 +9430,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
{ mesh_send, MGMT_MESH_SEND_SIZE,
HCI_MGMT_VAR_LEN },
{ mesh_send_cancel, MGMT_MESH_SEND_CANCEL_SIZE },
{ mgmt_hci_cmd_sync, MGMT_HCI_CMD_SYNC_SIZE, HCI_MGMT_VAR_LEN },
};
void mgmt_index_added(struct hci_dev *hdev)