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Bluetooth: ISO: Fix not using SID from adv report

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Up until now it has been assumed that the application would be able to
enter the advertising SID in sockaddr_iso_bc.bc_sid, but userspace has
no access to SID since the likes of MGMT_EV_DEVICE_FOUND cannot carry
it, so it was left unset (0x00) which means it would be unable to
synchronize if the broadcast source is using a different SID e.g. 0x04:

> HCI Event: LE Meta Event (0x3e) plen 57
      LE Extended Advertising Report (0x0d)
        Num reports: 1
        Entry 0
          Event type: 0x0000
            Props: 0x0000
            Data status: Complete
          Address type: Random (0x01)
          Address: 0B:82:E8:50:6D:C8 (Non-Resolvable)
          Primary PHY: LE 1M
          Secondary PHY: LE 2M
          SID: 0x04
          TX power: 127 dBm
          RSSI: -55 dBm (0xc9)
          Periodic advertising interval: 180.00 msec (0x0090)
          Direct address type: Public (0x00)
          Direct address: 00:00:00:00:00:00 (OUI 00-00-00)
          Data length: 0x1f
        06 16 52 18 5b 0b e1 05 16 56 18 04 00 11 30 4c  ..R.[....V....0L
        75 69 7a 27 73 20 53 32 33 20 55 6c 74 72 61     uiz's S23 Ultra
        Service Data: Broadcast Audio Announcement (0x1852)
        Broadcast ID: 14748507 (0xe10b5b)
        Service Data: Public Broadcast Announcement (0x1856)
          Data[2]: 0400
        Unknown EIR field 0x30[16]: 4c75697a27732053323320556c747261
< HCI Command: LE Periodic Advertising Create Sync (0x08|0x0044) plen 14
        Options: 0x0000
        Use advertising SID, Advertiser Address Type and address
        Reporting initially enabled
        SID: 0x00 (<- Invalid)
        Adv address type: Random (0x01)
        Adv address: 0B:82:E8:50:6D:C8 (Non-Resolvable)
        Skip: 0x0000
        Sync timeout: 20000 msec (0x07d0)
        Sync CTE type: 0x0000

So instead this changes now allow application to set HCI_SID_INVALID
which will make hci_le_pa_create_sync to wait for a report, update the
conn->sid using the report SID and only then issue PA create sync
command:

< HCI Command: LE Periodic Advertising Create Sync
        Options: 0x0000
        Use advertising SID, Advertiser Address Type and address
        Reporting initially enabled
        SID: 0x04
        Adv address type: Random (0x01)
        Adv address: 0B:82:E8:50:6D:C8 (Non-Resolvable)
        Skip: 0x0000
        Sync timeout: 20000 msec (0x07d0)
        Sync CTE type: 0x0000
> HCI Event: LE Meta Event (0x3e) plen 16
      LE Periodic Advertising Sync Established (0x0e)
        Status: Success (0x00)
        Sync handle: 64
        Advertising SID: 0x04
        Advertiser address type: Random (0x01)
        Advertiser address: 0B:82:E8:50:6D:C8 (Non-Resolvable)
        Advertiser PHY: LE 2M (0x02)
        Periodic advertising interval: 180.00 msec (0x0090)
        Advertiser clock accuracy: 0x05

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2025-04-11 12:37:50 -04:00
parent 96ace5519f
commit e2d471b780
5 changed files with 76 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/bluetooth/hci_conn.c
View File

@ -2070,6 +2070,8 @@ struct hci_conn *hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst,
{
struct hci_conn *conn;
bt_dev_dbg(hdev, "dst %pMR type %d sid %d", dst, dst_type, sid);
conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_SLAVE);
if (IS_ERR(conn))
return conn;

13
net/bluetooth/hci_core.c
View File

@ -4068,10 +4068,13 @@ static void hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb)
return;
}
err = hci_send_frame(hdev, skb);
if (err < 0) {
hci_cmd_sync_cancel_sync(hdev, -err);
return;
if (hci_skb_opcode(skb) != HCI_OP_NOP) {
err = hci_send_frame(hdev, skb);
if (err < 0) {
hci_cmd_sync_cancel_sync(hdev, -err);
return;
}
atomic_dec(&hdev->cmd_cnt);
}
if (hdev->req_status == HCI_REQ_PEND &&
@ -4079,8 +4082,6 @@ static void hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb)
kfree_skb(hdev->req_skb);
hdev->req_skb = skb_clone(hdev->sent_cmd, GFP_KERNEL);
}
atomic_dec(&hdev->cmd_cnt);
}
static void hci_cmd_work(struct work_struct *work)

16
net/bluetooth/hci_event.c
View File

@ -6351,6 +6351,17 @@ static void hci_le_ext_adv_report_evt(struct hci_dev *hdev, void *data,
info->secondary_phy &= 0x1f;
}
/* Check if PA Sync is pending and if the hci_conn SID has not
* been set update it.
*/
if (hci_dev_test_flag(hdev, HCI_PA_SYNC)) {
struct hci_conn *conn;
conn = hci_conn_hash_lookup_create_pa_sync(hdev);
if (conn && conn->sid == HCI_SID_INVALID)
conn->sid = info->sid;
}
if (legacy_evt_type != LE_ADV_INVALID) {
process_adv_report(hdev, legacy_evt_type, &info->bdaddr,
info->bdaddr_type, NULL, 0,
@ -7155,7 +7166,8 @@ static void hci_le_meta_evt(struct hci_dev *hdev, void *data,
/* Only match event if command OGF is for LE */
if (hdev->req_skb &&
hci_opcode_ogf(hci_skb_opcode(hdev->req_skb)) == 0x08 &&
(hci_opcode_ogf(hci_skb_opcode(hdev->req_skb)) == 0x08 ||
hci_skb_opcode(hdev->req_skb) == HCI_OP_NOP) &&
hci_skb_event(hdev->req_skb) == ev->subevent) {
*opcode = hci_skb_opcode(hdev->req_skb);
hci_req_cmd_complete(hdev, *opcode, 0x00, req_complete,
@ -7511,8 +7523,10 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb)
goto done;
}
hci_dev_lock(hdev);
kfree_skb(hdev->recv_event);
hdev->recv_event = skb_clone(skb, GFP_KERNEL);
hci_dev_unlock(hdev);
event = hdr->evt;
if (!event) {

51
net/bluetooth/hci_sync.c
View File

@ -6898,20 +6898,37 @@ int hci_le_conn_update_sync(struct hci_dev *hdev, struct hci_conn *conn,
static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
{
struct hci_conn *conn = data;
struct hci_conn *pa_sync;
bt_dev_dbg(hdev, "err %d", err);
if (!err)
return;
hci_dev_clear_flag(hdev, HCI_PA_SYNC);
if (err == -ECANCELED)
return;
hci_dev_lock(hdev);
hci_update_passive_scan_sync(hdev);
hci_dev_clear_flag(hdev, HCI_PA_SYNC);
if (!hci_conn_valid(hdev, conn))
clear_bit(HCI_CONN_CREATE_PA_SYNC, &conn->flags);
if (!err)
goto unlock;
/* Add connection to indicate PA sync error */
pa_sync = hci_conn_add_unset(hdev, ISO_LINK, BDADDR_ANY,
HCI_ROLE_SLAVE);
if (IS_ERR(pa_sync))
goto unlock;
set_bit(HCI_CONN_PA_SYNC_FAILED, &pa_sync->flags);
/* Notify iso layer */
hci_connect_cfm(pa_sync, bt_status(err));
unlock:
hci_dev_unlock(hdev);
}
@ -6925,9 +6942,23 @@ static int hci_le_pa_create_sync(struct hci_dev *hdev, void *data)
if (!hci_conn_valid(hdev, conn))
return -ECANCELED;
if (conn->sync_handle != HCI_SYNC_HANDLE_INVALID)
return -EINVAL;
if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC))
return -EBUSY;
/* Stop scanning if SID has not been set and active scanning is enabled
* so we use passive scanning which will be scanning using the allow
* list programmed to contain only the connection address.
*/
if (conn->sid == HCI_SID_INVALID &&
hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
hci_scan_disable_sync(hdev);
hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
}
/* Mark HCI_CONN_CREATE_PA_SYNC so hci_update_passive_scan_sync can
* program the address in the allow list so PA advertisements can be
* received.
@ -6936,6 +6967,14 @@ static int hci_le_pa_create_sync(struct hci_dev *hdev, void *data)
hci_update_passive_scan_sync(hdev);
/* SID has not been set listen for HCI_EV_LE_EXT_ADV_REPORT to update
* it.
*/
if (conn->sid == HCI_SID_INVALID)
__hci_cmd_sync_status_sk(hdev, HCI_OP_NOP, 0, NULL,
HCI_EV_LE_EXT_ADV_REPORT,
conn->conn_timeout, NULL);
memset(&cp, 0, sizeof(cp));
cp.options = qos->bcast.options;
cp.sid = conn->sid;

9
net/bluetooth/iso.c
View File

@ -941,7 +941,7 @@ static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
if (sa->iso_bc->bc_sid > 0x0f)
if (sa->iso_bc->bc_sid > 0x0f && sa->iso_bc->bc_sid != HCI_SID_INVALID)
return -EINVAL;
iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
@ -2029,6 +2029,9 @@ static bool iso_match_sid(struct sock *sk, void *data)
{
struct hci_ev_le_pa_sync_established *ev = data;
if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
return true;
return ev->sid == iso_pi(sk)->bc_sid;
}
@ -2075,8 +2078,10 @@ int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
if (ev1) {
sk = iso_get_sock(&hdev->bdaddr, bdaddr, BT_LISTEN,
iso_match_sid, ev1);
if (sk && !ev1->status)
if (sk && !ev1->status) {
iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
iso_pi(sk)->bc_sid = ev1->sid;
}
goto done;
}