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Bluetooth: ISO: Pass BIG encryption info through QoS

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This enables a broadcast sink to be informed if the PA
it has synced with is associated with an encrypted BIG,
by retrieving the socket QoS and checking the encryption
field.

After PA sync has been successfully established and the
first BIGInfo advertising report is received, a new hcon
is added and notified to the ISO layer. The ISO layer
sets the encryption field of the socket and hcon QoS
according to the encryption parameter of the BIGInfo
advertising report event.

After that, the userspace is woken up, and the QoS of the
new PA sync socket can be read, to inspect the encryption
field and follow up accordingly.

Signed-off-by: Iulia Tanasescu <iulia.tanasescu@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Iulia Tanasescu 2023-09-06 17:01:03 +03:00 committed by Luiz Augusto von Dentz
parent a254b90c9a
commit 1d11d70d1f
5 changed files with 82 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/bluetooth/hci.h
View File

@ -1,6 +1,7 @@
/*
BlueZ - Bluetooth protocol stack for Linux
Copyright (C) 2000-2001 Qualcomm Incorporated
Copyright 2023 NXP
Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
@ -673,6 +674,8 @@ enum {
#define HCI_TX_POWER_INVALID 127
#define HCI_RSSI_INVALID 127
#define HCI_SYNC_HANDLE_INVALID 0xffff
#define HCI_ROLE_MASTER 0x00
#define HCI_ROLE_SLAVE 0x01

25
include/net/bluetooth/hci_core.h
View File

@ -1314,7 +1314,7 @@ static inline struct hci_conn *hci_conn_hash_lookup_big_any_dst(struct hci_dev *
}
static inline struct hci_conn *
hci_conn_hash_lookup_pa_sync(struct hci_dev *hdev, __u8 big)
hci_conn_hash_lookup_pa_sync_big_handle(struct hci_dev *hdev, __u8 big)
{
struct hci_conn_hash *h = &hdev->conn_hash;
struct hci_conn *c;
@ -1336,6 +1336,29 @@ hci_conn_hash_lookup_pa_sync(struct hci_dev *hdev, __u8 big)
return NULL;
}
static inline struct hci_conn *
hci_conn_hash_lookup_pa_sync_handle(struct hci_dev *hdev, __u16 sync_handle)
{
struct hci_conn_hash *h = &hdev->conn_hash;
struct hci_conn *c;
rcu_read_lock();
list_for_each_entry_rcu(c, &h->list, list) {
if (c->type != ISO_LINK ||
!test_bit(HCI_CONN_PA_SYNC, &c->flags))
continue;
if (c->sync_handle == sync_handle) {
rcu_read_unlock();
return c;
}
}
rcu_read_unlock();
return NULL;
}
static inline struct hci_conn *hci_conn_hash_lookup_state(struct hci_dev *hdev,
__u8 type, __u16 state)
{

1
net/bluetooth/hci_conn.c
View File

@ -974,6 +974,7 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
conn->rssi = HCI_RSSI_INVALID;
conn->tx_power = HCI_TX_POWER_INVALID;
conn->max_tx_power = HCI_TX_POWER_INVALID;
conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
conn->disc_timeout = HCI_DISCONN_TIMEOUT;

54
net/bluetooth/hci_event.c
View File

@ -6603,7 +6603,7 @@ static void hci_le_pa_sync_estabilished_evt(struct hci_dev *hdev, void *data,
struct hci_ev_le_pa_sync_established *ev = data;
int mask = hdev->link_mode;
__u8 flags = 0;
struct hci_conn *bis;
struct hci_conn *pa_sync;
bt_dev_dbg(hdev, "status 0x%2.2x", ev->status);
@ -6620,20 +6620,19 @@ static void hci_le_pa_sync_estabilished_evt(struct hci_dev *hdev, void *data,
if (!(flags & HCI_PROTO_DEFER))
goto unlock;
/* Add connection to indicate the PA sync event */
bis = hci_conn_add(hdev, ISO_LINK, BDADDR_ANY,
HCI_ROLE_SLAVE);
if (ev->status) {
/* Add connection to indicate the failed PA sync event */
pa_sync = hci_conn_add(hdev, ISO_LINK, BDADDR_ANY,
HCI_ROLE_SLAVE);
if (!bis)
goto unlock;
if (!pa_sync)
goto unlock;
if (ev->status)
set_bit(HCI_CONN_PA_SYNC_FAILED, &bis->flags);
else
set_bit(HCI_CONN_PA_SYNC, &bis->flags);
set_bit(HCI_CONN_PA_SYNC_FAILED, &pa_sync->flags);
/* Notify connection to iso layer */
hci_connect_cfm(bis, ev->status);
/* Notify iso layer */
hci_connect_cfm(pa_sync, ev->status);
}
unlock:
hci_dev_unlock(hdev);
@ -7125,7 +7124,7 @@ static void hci_le_big_sync_established_evt(struct hci_dev *hdev, void *data,
hci_dev_lock(hdev);
if (!ev->status) {
pa_sync = hci_conn_hash_lookup_pa_sync(hdev, ev->handle);
pa_sync = hci_conn_hash_lookup_pa_sync_big_handle(hdev, ev->handle);
if (pa_sync)
/* Also mark the BIG sync established event on the
* associated PA sync hcon
@ -7186,15 +7185,42 @@ static void hci_le_big_info_adv_report_evt(struct hci_dev *hdev, void *data,
struct hci_evt_le_big_info_adv_report *ev = data;
int mask = hdev->link_mode;
__u8 flags = 0;
struct hci_conn *pa_sync;
bt_dev_dbg(hdev, "sync_handle 0x%4.4x", le16_to_cpu(ev->sync_handle));
hci_dev_lock(hdev);
mask |= hci_proto_connect_ind(hdev, BDADDR_ANY, ISO_LINK, &flags);
if (!(mask & HCI_LM_ACCEPT))
if (!(mask & HCI_LM_ACCEPT)) {
hci_le_pa_term_sync(hdev, ev->sync_handle);
goto unlock;
}
if (!(flags & HCI_PROTO_DEFER))
goto unlock;
pa_sync = hci_conn_hash_lookup_pa_sync_handle
(hdev,
le16_to_cpu(ev->sync_handle));
if (pa_sync)
goto unlock;
/* Add connection to indicate the PA sync event */
pa_sync = hci_conn_add(hdev, ISO_LINK, BDADDR_ANY,
HCI_ROLE_SLAVE);
if (!pa_sync)
goto unlock;
pa_sync->sync_handle = le16_to_cpu(ev->sync_handle);
set_bit(HCI_CONN_PA_SYNC, &pa_sync->flags);
/* Notify iso layer */
hci_connect_cfm(pa_sync, 0x00);
unlock:
hci_dev_unlock(hdev);
}

19
net/bluetooth/iso.c
View File

@ -77,6 +77,7 @@ static struct bt_iso_qos default_qos;
static bool check_ucast_qos(struct bt_iso_qos *qos);
static bool check_bcast_qos(struct bt_iso_qos *qos);
static bool iso_match_sid(struct sock *sk, void *data);
static bool iso_match_sync_handle(struct sock *sk, void *data);
static void iso_sock_disconn(struct sock *sk);
/* ---- ISO timers ---- */
@ -1202,7 +1203,6 @@ static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
test_bit(HCI_CONN_PA_SYNC, &pi->conn->hcon->flags)) {
iso_conn_big_sync(sk);
sk->sk_state = BT_LISTEN;
set_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
} else {
iso_conn_defer_accept(pi->conn->hcon);
sk->sk_state = BT_CONFIG;
@ -1579,6 +1579,7 @@ static void iso_conn_ready(struct iso_conn *conn)
struct sock *sk = conn->sk;
struct hci_ev_le_big_sync_estabilished *ev = NULL;
struct hci_ev_le_pa_sync_established *ev2 = NULL;
struct hci_evt_le_big_info_adv_report *ev3 = NULL;
struct hci_conn *hcon;
BT_DBG("conn %p", conn);
@ -1603,14 +1604,20 @@ static void iso_conn_ready(struct iso_conn *conn)
parent = iso_get_sock_listen(&hcon->src,
&hcon->dst,
iso_match_big, ev);
} else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags) ||
test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
} else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
ev2 = hci_recv_event_data(hcon->hdev,
HCI_EV_LE_PA_SYNC_ESTABLISHED);
if (ev2)
parent = iso_get_sock_listen(&hcon->src,
&hcon->dst,
iso_match_sid, ev2);
} else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
ev3 = hci_recv_event_data(hcon->hdev,
HCI_EVT_LE_BIG_INFO_ADV_REPORT);
if (ev3)
parent = iso_get_sock_listen(&hcon->src,
&hcon->dst,
iso_match_sync_handle, ev3);
}
if (!parent)
@ -1650,11 +1657,13 @@ static void iso_conn_ready(struct iso_conn *conn)
hcon->sync_handle = iso_pi(parent)->sync_handle;
}
if (ev2 && !ev2->status) {
iso_pi(sk)->sync_handle = iso_pi(parent)->sync_handle;
if (ev3) {
iso_pi(sk)->qos = iso_pi(parent)->qos;
iso_pi(sk)->qos.bcast.encryption = ev3->encryption;
hcon->iso_qos = iso_pi(sk)->qos;
iso_pi(sk)->bc_num_bis = iso_pi(parent)->bc_num_bis;
memcpy(iso_pi(sk)->bc_bis, iso_pi(parent)->bc_bis, ISO_MAX_NUM_BIS);
set_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
}
bacpy(&iso_pi(sk)->dst, &hcon->dst);