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BACKPORT: FROMLIST: Bluetooth: adding configurable eir_max_name_len
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This change adds support for a configurable eir_max_name_len for
platforms which requires a larger than 48 bytes complete name in EIR.

From bluetoothctl:
[bluetooth]# system-alias
012345678901234567890123456789012345678901234567890123456789
Changing 012345678901234567890123456789012345678901234567890123456789
succeeded
[CHG] Controller DC:71:96:69:02:89 Alias:
012345678901234567890123456789012345678901234567890123456789

From btmon:
< HCI Command: Write Local Name (0x03|0x0013) plen 248     torvalds#109
[hci0] 88.567990
        Name:
012345678901234567890123456789012345678901234567890123456789
> HCI Event: Command Complete (0x0e) plen 4  torvalds#110 [hci0] 88.663854
      Write Local Name (0x03|0x0013) ncmd 1
        Status: Success (0x00)
@ MGMT Event: Local Name Changed (0x0008) plen 260               
{0x0004} [hci0] 88.663948
        Name:
012345678901234567890123456789012345678901234567890123456789
        Short name:
< HCI Command: Write Extended Inquiry Response (0x03|0x0052) plen 241
 torvalds#111 [hci0] 88.663977
        FEC: Not required (0x00)
        Name (complete):
012345678901234567890123456789012345678901234567890123456789
        TX power: 12 dBm
        Device ID: Bluetooth SIG assigned (0x0001)
          Vendor: Google (224)
          Product: 0xc405
          Version: 0.5.6 (0x0056)
        16-bit Service UUIDs (complete): 7 entries
          Generic Access Profile (0x1800)
          Generic Attribute Profile (0x1801)
          Device Information (0x180a)
          A/V Remote Control (0x110e)
          A/V Remote Control Target (0x110c)
          Handsfree Audio Gateway (0x111f)
          Audio Source (0x110a)
> HCI Event: Command Complete (0x0e) plen 4    torvalds#112 [hci0] 88.664874
      Write Extended Inquiry Response (0x03|0x0052) ncmd 1
        Status: Success (0x00)

    (am from https://patchwork.kernel.org/patch/11687367/)

Reviewed-by: Sonny Sasaka <[email protected]>
Reviewed-by: Abhishek Pandit-Subedi <[email protected]>
Signed-off-by: Alain Michaud <[email protected]>

Backport notes: HDEV_PARAM_U16 is changed from two parameters to one
parameter.

BUG=none
TEST=build

Signed-off-by: Zhengping Jiang <[email protected]>
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Alain Michaud authored and Bartłomiej Bujak committed Jul 15, 2024
1 parent c792684 commit b2300a9
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Showing 4 changed files with 28 additions and 9 deletions.
1 change: 1 addition & 0 deletions include/net/bluetooth/hci_core.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -363,6 +363,7 @@ struct hci_dev {
__u8 dev_name[HCI_MAX_NAME_LENGTH];
__u8 short_name[HCI_MAX_SHORT_NAME_LENGTH];
__u8 eir[HCI_MAX_EIR_LENGTH];
__u16 eir_max_name_len;
__u16 appearance;
__u8 dev_class[3];
__u8 major_class;
Expand Down
29 changes: 20 additions & 9 deletions net/bluetooth/eir.c
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Original file line number Diff line number Diff line change
Expand Up @@ -175,36 +175,42 @@ static u8 *create_uuid128_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
void eir_create(struct hci_dev *hdev, u8 *data)
{
u8 *ptr = data;
u8 size_remaining = HCI_MAX_EIR_LENGTH;
size_t name_len;

name_len = strnlen(hdev->dev_name, sizeof(hdev->dev_name));

if (name_len > 0) {
/* EIR Data type */
if (name_len > 48) {
name_len = 48;
if (name_len > min_t(u16, (HCI_MAX_EIR_LENGTH - 2),
hdev->eir_max_name_len)) {
name_len = min_t(u16, (HCI_MAX_EIR_LENGTH - 2),
hdev->eir_max_name_len);
ptr[1] = EIR_NAME_SHORT;
} else {
} else
ptr[1] = EIR_NAME_COMPLETE;
}

/* EIR Data length */
ptr[0] = name_len + 1;

memcpy(ptr + 2, hdev->dev_name, name_len);

ptr += (name_len + 2);
size_remaining -= (name_len + 2);
}

if (hdev->inq_tx_power != HCI_TX_POWER_INVALID) {
if (hdev->inq_tx_power != HCI_TX_POWER_INVALID &&
size_remaining >= 3) {
ptr[0] = 2;
ptr[1] = EIR_TX_POWER;
ptr[2] = (u8)hdev->inq_tx_power;

ptr += 3;
size_remaining -= 3;
}

if (hdev->devid_source > 0) {
if (hdev->devid_source > 0 &&
size_remaining >= 10) {
ptr[0] = 9;
ptr[1] = EIR_DEVICE_ID;

Expand All @@ -214,11 +220,16 @@ void eir_create(struct hci_dev *hdev, u8 *data)
put_unaligned_le16(hdev->devid_version, ptr + 8);

ptr += 10;
size_remaining -= 10;
}

ptr = create_uuid16_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
ptr = create_uuid32_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
ptr = create_uuid128_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
ptr = create_uuid16_list(hdev, ptr, size_remaining);
size_remaining = HCI_MAX_EIR_LENGTH - (ptr - data);

ptr = create_uuid32_list(hdev, ptr, size_remaining);
size_remaining = HCI_MAX_EIR_LENGTH - (ptr - data);

ptr = create_uuid128_list(hdev, ptr, size_remaining);
}

u8 eir_create_per_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr)
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1 change: 1 addition & 0 deletions net/bluetooth/hci_core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2483,6 +2483,7 @@ struct hci_dev *hci_alloc_dev_priv(int sizeof_priv)
hdev->adv_instance_cnt = 0;
hdev->cur_adv_instance = 0x00;
hdev->adv_instance_timeout = 0;
hdev->eir_max_name_len = 48;

hdev->advmon_allowlist_duration = 300;
hdev->advmon_no_filter_duration = 500;
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6 changes: 6 additions & 0 deletions net/bluetooth/mgmt_config.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,7 @@ int read_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data,
HDEV_PARAM_U16(le_conn_latency);
HDEV_PARAM_U16(le_supv_timeout);
HDEV_PARAM_U16(def_le_autoconnect_timeout);
HDEV_PARAM_U16(eir_max_name_len);
HDEV_PARAM_U16(advmon_allowlist_duration);
HDEV_PARAM_U16(advmon_no_filter_duration);
HDEV_PARAM_U8(enable_advmon_interleave_scan);
Expand Down Expand Up @@ -108,6 +109,7 @@ int read_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data,
TLV_SET_U16(0x001a, le_supv_timeout),
TLV_SET_U16_JIFFIES_TO_MSECS(0x001b,
def_le_autoconnect_timeout),
TLV_SET_U16(0x001c, eir_max_name_len),
TLV_SET_U16(0x001d, advmon_allowlist_duration),
TLV_SET_U16(0x001e, advmon_no_filter_duration),
TLV_SET_U8(0x001f, enable_advmon_interleave_scan),
Expand Down Expand Up @@ -184,6 +186,7 @@ int set_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data,
case 0x0019:
case 0x001a:
case 0x001b:
case 0x001c:
case 0x001d:
case 0x001e:
exp_type_len = sizeof(u16);
Expand Down Expand Up @@ -305,6 +308,9 @@ int set_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data,
hdev->def_le_autoconnect_timeout =
msecs_to_jiffies(TLV_GET_LE16(buffer));
break;
case 0x0001c:
hdev->eir_max_name_len = TLV_GET_LE16(buffer);
break;
case 0x0001d:
hdev->advmon_allowlist_duration = TLV_GET_LE16(buffer);
break;
Expand Down

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