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Bluetooth: Add support for Get Advertising Size Information command

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The Get Advertising Size Information command allows to retrieve size
information for advertising data and scan response data fields depending
on the selected flags. This is useful if applications want to know the
available size ahead of time.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2015-11-19 16:16:43 +01:00 committed by Johan Hedberg
parent 31a3248dd9
commit 40b25fe5dc
2 changed files with 71 additions and 0 deletions
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13
include/net/bluetooth/mgmt.h
View File

@ -571,6 +571,19 @@ struct mgmt_rp_remove_advertising {
__u8 instance;
} __packed;
#define MGMT_OP_GET_ADV_SIZE_INFO 0x0040
struct mgmt_cp_get_adv_size_info {
__u8 instance;
__le32 flags;
} __packed;
#define MGMT_GET_ADV_SIZE_INFO_SIZE 5
struct mgmt_rp_get_adv_size_info {
__u8 instance;
__le32 flags;
__u8 max_adv_data_len;
__u8 max_scan_rsp_len;
} __packed;
#define MGMT_EV_CMD_COMPLETE 0x0001
struct mgmt_ev_cmd_complete {
__le16 opcode;

58
net/bluetooth/mgmt.c
View File

@ -102,6 +102,7 @@ static const u16 mgmt_commands[] = {
MGMT_OP_READ_ADV_FEATURES,
MGMT_OP_ADD_ADVERTISING,
MGMT_OP_REMOVE_ADVERTISING,
MGMT_OP_GET_ADV_SIZE_INFO,
};
static const u16 mgmt_events[] = {
@ -7059,6 +7060,62 @@ unlock:
return err;
}
static u8 tlv_data_max_len(u32 adv_flags, bool is_adv_data)
{
u8 max_len = HCI_MAX_AD_LENGTH;
if (is_adv_data) {
if (adv_flags & (MGMT_ADV_FLAG_DISCOV |
MGMT_ADV_FLAG_LIMITED_DISCOV |
MGMT_ADV_FLAG_MANAGED_FLAGS))
max_len -= 3;
if (adv_flags & MGMT_ADV_FLAG_TX_POWER)
max_len -= 3;
}
return max_len;
}
static int get_adv_size_info(struct sock *sk, struct hci_dev *hdev,
void *data, u16 data_len)
{
struct mgmt_cp_get_adv_size_info *cp = data;
struct mgmt_rp_get_adv_size_info rp;
u32 flags, supported_flags;
int err;
BT_DBG("%s", hdev->name);
if (!lmp_le_capable(hdev))
return mgmt_cmd_status(sk, hdev->id, MGMT_OP_GET_ADV_SIZE_INFO,
MGMT_STATUS_REJECTED);
if (cp->instance < 1 || cp->instance > HCI_MAX_ADV_INSTANCES)
return mgmt_cmd_status(sk, hdev->id, MGMT_OP_GET_ADV_SIZE_INFO,
MGMT_STATUS_INVALID_PARAMS);
flags = __le32_to_cpu(cp->flags);
/* The current implementation only supports a subset of the specified
* flags.
*/
supported_flags = get_supported_adv_flags(hdev);
if (flags & ~supported_flags)
return mgmt_cmd_status(sk, hdev->id, MGMT_OP_GET_ADV_SIZE_INFO,
MGMT_STATUS_INVALID_PARAMS);
rp.instance = cp->instance;
rp.flags = cp->flags;
rp.max_adv_data_len = tlv_data_max_len(flags, true);
rp.max_scan_rsp_len = tlv_data_max_len(flags, false);
err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_GET_ADV_SIZE_INFO,
MGMT_STATUS_SUCCESS, &rp, sizeof(rp));
return err;
}
static const struct hci_mgmt_handler mgmt_handlers[] = {
{ NULL }, /* 0x0000 (no command) */
{ read_version, MGMT_READ_VERSION_SIZE,
@ -7146,6 +7203,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
{ add_advertising, MGMT_ADD_ADVERTISING_SIZE,
HCI_MGMT_VAR_LEN },
{ remove_advertising, MGMT_REMOVE_ADVERTISING_SIZE },
{ get_adv_size_info, MGMT_GET_ADV_SIZE_INFO_SIZE },
};
void mgmt_index_added(struct hci_dev *hdev)