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linuxdebug/net/bluetooth/iso.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2022 Intel Corporation
*/
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/sched/signal.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/iso.h>
static const struct proto_ops iso_sock_ops;
static struct bt_sock_list iso_sk_list = {
.lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
};
/* ---- ISO connections ---- */
struct iso_conn {
struct hci_conn *hcon;
/* @lock: spinlock protecting changes to iso_conn fields */
spinlock_t lock;
struct sock *sk;
struct delayed_work timeout_work;
struct sk_buff *rx_skb;
__u32 rx_len;
__u16 tx_sn;
};
#define iso_conn_lock(c) spin_lock(&(c)->lock)
#define iso_conn_unlock(c) spin_unlock(&(c)->lock)
static void iso_sock_close(struct sock *sk);
static void iso_sock_kill(struct sock *sk);
/* ----- ISO socket info ----- */
#define iso_pi(sk) ((struct iso_pinfo *)sk)
#define EIR_SERVICE_DATA_LENGTH 4
#define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)
struct iso_pinfo {
struct bt_sock bt;
bdaddr_t src;
__u8 src_type;
bdaddr_t dst;
__u8 dst_type;
__u8 bc_sid;
__u8 bc_num_bis;
__u8 bc_bis[ISO_MAX_NUM_BIS];
__u16 sync_handle;
__u32 flags;
struct bt_iso_qos qos;
__u8 base_len;
__u8 base[BASE_MAX_LENGTH];
struct iso_conn *conn;
};
/* ---- ISO timers ---- */
#define ISO_CONN_TIMEOUT (HZ * 40)
#define ISO_DISCONN_TIMEOUT (HZ * 2)
static void iso_sock_timeout(struct work_struct *work)
{
struct iso_conn *conn = container_of(work, struct iso_conn,
timeout_work.work);
struct sock *sk;
iso_conn_lock(conn);
sk = conn->sk;
if (sk)
sock_hold(sk);
iso_conn_unlock(conn);
if (!sk)
return;
BT_DBG("sock %p state %d", sk, sk->sk_state);
lock_sock(sk);
sk->sk_err = ETIMEDOUT;
sk->sk_state_change(sk);
release_sock(sk);
sock_put(sk);
}
static void iso_sock_set_timer(struct sock *sk, long timeout)
{
if (!iso_pi(sk)->conn)
return;
BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
schedule_delayed_work(&iso_pi(sk)->conn->timeout_work, timeout);
}
static void iso_sock_clear_timer(struct sock *sk)
{
if (!iso_pi(sk)->conn)
return;
BT_DBG("sock %p state %d", sk, sk->sk_state);
cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
}
/* ---- ISO connections ---- */
static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
{
struct iso_conn *conn = hcon->iso_data;
if (conn) {
if (!conn->hcon)
conn->hcon = hcon;
return conn;
}
conn = kzalloc(sizeof(*conn), GFP_KERNEL);
if (!conn)
return NULL;
spin_lock_init(&conn->lock);
INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);
hcon->iso_data = conn;
conn->hcon = hcon;
conn->tx_sn = 0;
BT_DBG("hcon %p conn %p", hcon, conn);
return conn;
}
/* Delete channel. Must be called on the locked socket. */
static void iso_chan_del(struct sock *sk, int err)
{
struct iso_conn *conn;
struct sock *parent;
conn = iso_pi(sk)->conn;
BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
if (conn) {
iso_conn_lock(conn);
conn->sk = NULL;
iso_pi(sk)->conn = NULL;
iso_conn_unlock(conn);
if (conn->hcon)
hci_conn_drop(conn->hcon);
}
sk->sk_state = BT_CLOSED;
sk->sk_err = err;
parent = bt_sk(sk)->parent;
if (parent) {
bt_accept_unlink(sk);
parent->sk_data_ready(parent);
} else {
sk->sk_state_change(sk);
}
sock_set_flag(sk, SOCK_ZAPPED);
}
static void iso_conn_del(struct hci_conn *hcon, int err)
{
struct iso_conn *conn = hcon->iso_data;
struct sock *sk;
if (!conn)
return;
BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
/* Kill socket */
iso_conn_lock(conn);
sk = conn->sk;
if (sk)
sock_hold(sk);
iso_conn_unlock(conn);
if (sk) {
lock_sock(sk);
iso_sock_clear_timer(sk);
iso_chan_del(sk, err);
release_sock(sk);
sock_put(sk);
}
/* Ensure no more work items will run before freeing conn. */
cancel_delayed_work_sync(&conn->timeout_work);
hcon->iso_data = NULL;
kfree(conn);
}
static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
struct sock *parent)
{
BT_DBG("conn %p", conn);
if (iso_pi(sk)->conn == conn && conn->sk == sk)
return 0;
if (conn->sk) {
BT_ERR("conn->sk already set");
return -EBUSY;
}
iso_pi(sk)->conn = conn;
conn->sk = sk;
if (parent)
bt_accept_enqueue(parent, sk, true);
return 0;
}
static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
struct sock *parent)
{
int err;
iso_conn_lock(conn);
err = __iso_chan_add(conn, sk, parent);
iso_conn_unlock(conn);
return err;
}
static inline u8 le_addr_type(u8 bdaddr_type)
{
if (bdaddr_type == BDADDR_LE_PUBLIC)
return ADDR_LE_DEV_PUBLIC;
else
return ADDR_LE_DEV_RANDOM;
}
static int iso_connect_bis(struct sock *sk)
{
struct iso_conn *conn;
struct hci_conn *hcon;
struct hci_dev *hdev;
int err;
BT_DBG("%pMR", &iso_pi(sk)->src);
hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
iso_pi(sk)->src_type);
if (!hdev)
return -EHOSTUNREACH;
hci_dev_lock(hdev);
if (!bis_capable(hdev)) {
err = -EOPNOTSUPP;
goto unlock;
}
/* Fail if out PHYs are marked as disabled */
if (!iso_pi(sk)->qos.out.phy) {
err = -EINVAL;
goto unlock;
}
hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst, iso_pi(sk)->dst_type,
&iso_pi(sk)->qos, iso_pi(sk)->base_len,
iso_pi(sk)->base);
if (IS_ERR(hcon)) {
err = PTR_ERR(hcon);
goto unlock;
}
conn = iso_conn_add(hcon);
if (!conn) {
hci_conn_drop(hcon);
err = -ENOMEM;
goto unlock;
}
lock_sock(sk);
err = iso_chan_add(conn, sk, NULL);
if (err) {
release_sock(sk);
goto unlock;
}
/* Update source addr of the socket */
bacpy(&iso_pi(sk)->src, &hcon->src);
if (hcon->state == BT_CONNECTED) {
iso_sock_clear_timer(sk);
sk->sk_state = BT_CONNECTED;
} else {
sk->sk_state = BT_CONNECT;
iso_sock_set_timer(sk, sk->sk_sndtimeo);
}
release_sock(sk);
unlock:
hci_dev_unlock(hdev);
hci_dev_put(hdev);
return err;
}
static int iso_connect_cis(struct sock *sk)
{
struct iso_conn *conn;
struct hci_conn *hcon;
struct hci_dev *hdev;
int err;
BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
iso_pi(sk)->src_type);
if (!hdev)
return -EHOSTUNREACH;
hci_dev_lock(hdev);
if (!cis_central_capable(hdev)) {
err = -EOPNOTSUPP;
goto unlock;
}
/* Fail if either PHYs are marked as disabled */
if (!iso_pi(sk)->qos.in.phy && !iso_pi(sk)->qos.out.phy) {
err = -EINVAL;
goto unlock;
}
/* Just bind if DEFER_SETUP has been set */
if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
le_addr_type(iso_pi(sk)->dst_type),
&iso_pi(sk)->qos);
if (IS_ERR(hcon)) {
err = PTR_ERR(hcon);
goto unlock;
}
} else {
hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
le_addr_type(iso_pi(sk)->dst_type),
&iso_pi(sk)->qos);
if (IS_ERR(hcon)) {
err = PTR_ERR(hcon);
goto unlock;
}
}
conn = iso_conn_add(hcon);
if (!conn) {
hci_conn_drop(hcon);
err = -ENOMEM;
goto unlock;
}
lock_sock(sk);
err = iso_chan_add(conn, sk, NULL);
if (err) {
release_sock(sk);
goto unlock;
}
/* Update source addr of the socket */
bacpy(&iso_pi(sk)->src, &hcon->src);
if (hcon->state == BT_CONNECTED) {
iso_sock_clear_timer(sk);
sk->sk_state = BT_CONNECTED;
} else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
iso_sock_clear_timer(sk);
sk->sk_state = BT_CONNECT;
} else {
sk->sk_state = BT_CONNECT;
iso_sock_set_timer(sk, sk->sk_sndtimeo);
}
release_sock(sk);
unlock:
hci_dev_unlock(hdev);
hci_dev_put(hdev);
return err;
}
static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
{
if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
return &iso_pi(sk)->conn->hcon->iso_qos;
return &iso_pi(sk)->qos;
}
static int iso_send_frame(struct sock *sk, struct sk_buff *skb)
{
struct iso_conn *conn = iso_pi(sk)->conn;
struct bt_iso_qos *qos = iso_sock_get_qos(sk);
struct hci_iso_data_hdr *hdr;
int len = 0;
BT_DBG("sk %p len %d", sk, skb->len);
if (skb->len > qos->out.sdu)
return -EMSGSIZE;
len = skb->len;
/* Push ISO data header */
hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
hdr->sn = cpu_to_le16(conn->tx_sn++);
hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
HCI_ISO_STATUS_VALID));
if (sk->sk_state == BT_CONNECTED)
hci_send_iso(conn->hcon, skb);
else
len = -ENOTCONN;
return len;
}
static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
{
struct sock *sk;
iso_conn_lock(conn);
sk = conn->sk;
iso_conn_unlock(conn);
if (!sk)
goto drop;
BT_DBG("sk %p len %d", sk, skb->len);
if (sk->sk_state != BT_CONNECTED)
goto drop;
if (!sock_queue_rcv_skb(sk, skb))
return;
drop:
kfree_skb(skb);
}
/* -------- Socket interface ---------- */
static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *ba)
{
struct sock *sk;
sk_for_each(sk, &iso_sk_list.head) {
if (sk->sk_state != BT_LISTEN)
continue;
if (!bacmp(&iso_pi(sk)->src, ba))
return sk;
}
return NULL;
}
static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
__u8 sid)
{
struct sock *sk;
sk_for_each(sk, &iso_sk_list.head) {
if (sk->sk_state != BT_LISTEN)
continue;
if (bacmp(&iso_pi(sk)->src, ba))
continue;
if (bacmp(&iso_pi(sk)->dst, bc))
continue;
if (iso_pi(sk)->bc_sid == sid)
return sk;
}
return NULL;
}
typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
/* Find socket listening:
* source bdaddr (Unicast)
* destination bdaddr (Broadcast only)
* match func - pass NULL to ignore
* match func data - pass -1 to ignore
* Returns closest match.
*/
static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
iso_sock_match_t match, void *data)
{
struct sock *sk = NULL, *sk1 = NULL;
read_lock(&iso_sk_list.lock);
sk_for_each(sk, &iso_sk_list.head) {
if (sk->sk_state != BT_LISTEN)
continue;
/* Match Broadcast destination */
if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst))
continue;
/* Use Match function if provided */
if (match && !match(sk, data))
continue;
/* Exact match. */
if (!bacmp(&iso_pi(sk)->src, src))
break;
/* Closest match */
if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY))
sk1 = sk;
}
read_unlock(&iso_sk_list.lock);
return sk ? sk : sk1;
}
static void iso_sock_destruct(struct sock *sk)
{
BT_DBG("sk %p", sk);
skb_queue_purge(&sk->sk_receive_queue);
skb_queue_purge(&sk->sk_write_queue);
}
static void iso_sock_cleanup_listen(struct sock *parent)
{
struct sock *sk;
BT_DBG("parent %p", parent);
/* Close not yet accepted channels */
while ((sk = bt_accept_dequeue(parent, NULL))) {
iso_sock_close(sk);
iso_sock_kill(sk);
}
parent->sk_state = BT_CLOSED;
sock_set_flag(parent, SOCK_ZAPPED);
}
/* Kill socket (only if zapped and orphan)
* Must be called on unlocked socket.
*/
static void iso_sock_kill(struct sock *sk)
{
if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
sock_flag(sk, SOCK_DEAD))
return;
BT_DBG("sk %p state %d", sk, sk->sk_state);
/* Kill poor orphan */
bt_sock_unlink(&iso_sk_list, sk);
sock_set_flag(sk, SOCK_DEAD);
sock_put(sk);
}
static void iso_conn_defer_reject(struct hci_conn *conn)
{
struct hci_cp_le_reject_cis cp;
BT_DBG("conn %p", conn);
memset(&cp, 0, sizeof(cp));
cp.handle = cpu_to_le16(conn->handle);
cp.reason = HCI_ERROR_REJ_BAD_ADDR;
hci_send_cmd(conn->hdev, HCI_OP_LE_REJECT_CIS, sizeof(cp), &cp);
}
static void __iso_sock_close(struct sock *sk)
{
BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
switch (sk->sk_state) {
case BT_LISTEN:
iso_sock_cleanup_listen(sk);
break;
case BT_CONNECTED:
case BT_CONFIG:
if (iso_pi(sk)->conn->hcon) {
sk->sk_state = BT_DISCONN;
iso_sock_set_timer(sk, ISO_DISCONN_TIMEOUT);
iso_conn_lock(iso_pi(sk)->conn);
hci_conn_drop(iso_pi(sk)->conn->hcon);
iso_pi(sk)->conn->hcon = NULL;
iso_conn_unlock(iso_pi(sk)->conn);
} else {
iso_chan_del(sk, ECONNRESET);
}
break;
case BT_CONNECT2:
if (iso_pi(sk)->conn->hcon)
iso_conn_defer_reject(iso_pi(sk)->conn->hcon);
iso_chan_del(sk, ECONNRESET);
break;
case BT_CONNECT:
/* In case of DEFER_SETUP the hcon would be bound to CIG which
* needs to be removed so just call hci_conn_del so the cleanup
* callback do what is needed.
*/
if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
iso_pi(sk)->conn->hcon) {
hci_conn_del(iso_pi(sk)->conn->hcon);
iso_pi(sk)->conn->hcon = NULL;
}
iso_chan_del(sk, ECONNRESET);
break;
case BT_DISCONN:
iso_chan_del(sk, ECONNRESET);
break;
default:
sock_set_flag(sk, SOCK_ZAPPED);
break;
}
}
/* Must be called on unlocked socket. */
static void iso_sock_close(struct sock *sk)
{
iso_sock_clear_timer(sk);
lock_sock(sk);
__iso_sock_close(sk);
release_sock(sk);
iso_sock_kill(sk);
}
static void iso_sock_init(struct sock *sk, struct sock *parent)
{
BT_DBG("sk %p", sk);
if (parent) {
sk->sk_type = parent->sk_type;
bt_sk(sk)->flags = bt_sk(parent)->flags;
security_sk_clone(parent, sk);
}
}
static struct proto iso_proto = {
.name = "ISO",
.owner = THIS_MODULE,
.obj_size = sizeof(struct iso_pinfo)
};
#define DEFAULT_IO_QOS \
{ \
.interval = 10000u, \
.latency = 10u, \
.sdu = 40u, \
.phy = BT_ISO_PHY_2M, \
.rtn = 2u, \
}
static struct bt_iso_qos default_qos = {
.cig = BT_ISO_QOS_CIG_UNSET,
.cis = BT_ISO_QOS_CIS_UNSET,
.sca = 0x00,
.packing = 0x00,
.framing = 0x00,
.in = DEFAULT_IO_QOS,
.out = DEFAULT_IO_QOS,
};
static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
int proto, gfp_t prio, int kern)
{
struct sock *sk;
sk = sk_alloc(net, PF_BLUETOOTH, prio, &iso_proto, kern);
if (!sk)
return NULL;
sock_init_data(sock, sk);
INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
sk->sk_destruct = iso_sock_destruct;
sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
sock_reset_flag(sk, SOCK_ZAPPED);
sk->sk_protocol = proto;
sk->sk_state = BT_OPEN;
/* Set address type as public as default src address is BDADDR_ANY */
iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
iso_pi(sk)->qos = default_qos;
bt_sock_link(&iso_sk_list, sk);
return sk;
}
static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct sock *sk;
BT_DBG("sock %p", sock);
sock->state = SS_UNCONNECTED;
if (sock->type != SOCK_SEQPACKET)
return -ESOCKTNOSUPPORT;
sock->ops = &iso_sock_ops;
sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
if (!sk)
return -ENOMEM;
iso_sock_init(sk, NULL);
return 0;
}
static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
int addr_len)
{
struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
struct sock *sk = sock->sk;
int i;
BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
sa->iso_bc->bc_num_bis);
if (addr_len > sizeof(*sa) + sizeof(*sa->iso_bc) ||
sa->iso_bc->bc_num_bis < 0x01 || sa->iso_bc->bc_num_bis > 0x1f)
return -EINVAL;
bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
iso_pi(sk)->sync_handle = -1;
iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
for (i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
if (sa->iso_bc->bc_bis[i] < 0x01 ||
sa->iso_bc->bc_bis[i] > 0x1f)
return -EINVAL;
memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
iso_pi(sk)->bc_num_bis);
}
return 0;
}
static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
int addr_len)
{
struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
struct sock *sk = sock->sk;
int err = 0;
BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
lock_sock(sk);
if (sk->sk_state != BT_OPEN) {
err = -EBADFD;
goto done;
}
if (sk->sk_type != SOCK_SEQPACKET) {
err = -EINVAL;
goto done;
}
/* Check if the address type is of LE type */
if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
err = -EINVAL;
goto done;
}
bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
iso_pi(sk)->src_type = sa->iso_bdaddr_type;
/* Check for Broadcast address */
if (addr_len > sizeof(*sa)) {
err = iso_sock_bind_bc(sock, addr, addr_len);
if (err)
goto done;
}
sk->sk_state = BT_BOUND;
done:
release_sock(sk);
return err;
}
static int iso_sock_connect(struct socket *sock, struct sockaddr *addr,
int alen, int flags)
{
struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
struct sock *sk = sock->sk;
int err;
BT_DBG("sk %p", sk);
if (alen < sizeof(struct sockaddr_iso) ||
addr->sa_family != AF_BLUETOOTH)
return -EINVAL;
if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
return -EBADFD;
if (sk->sk_type != SOCK_SEQPACKET)
return -EINVAL;
/* Check if the address type is of LE type */
if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
return -EINVAL;
lock_sock(sk);
bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
release_sock(sk);
if (bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
err = iso_connect_cis(sk);
else
err = iso_connect_bis(sk);
if (err)
return err;
lock_sock(sk);
if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
err = bt_sock_wait_state(sk, BT_CONNECTED,
sock_sndtimeo(sk, flags & O_NONBLOCK));
}
release_sock(sk);
return err;
}
static int iso_listen_bis(struct sock *sk)
{
struct hci_dev *hdev;
int err = 0;
BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
&iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
write_lock(&iso_sk_list.lock);
if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
iso_pi(sk)->bc_sid))
err = -EADDRINUSE;
write_unlock(&iso_sk_list.lock);
if (err)
return err;
hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
iso_pi(sk)->src_type);
if (!hdev)
return -EHOSTUNREACH;
hci_dev_lock(hdev);
err = hci_pa_create_sync(hdev, &iso_pi(sk)->dst, iso_pi(sk)->dst_type,
iso_pi(sk)->bc_sid);
hci_dev_unlock(hdev);
hci_dev_put(hdev);
return err;
}
static int iso_listen_cis(struct sock *sk)
{
int err = 0;
BT_DBG("%pMR", &iso_pi(sk)->src);
write_lock(&iso_sk_list.lock);
if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src))
err = -EADDRINUSE;
write_unlock(&iso_sk_list.lock);
return err;
}
static int iso_sock_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
int err = 0;
BT_DBG("sk %p backlog %d", sk, backlog);
lock_sock(sk);
if (sk->sk_state != BT_BOUND) {
err = -EBADFD;
goto done;
}
if (sk->sk_type != SOCK_SEQPACKET) {
err = -EINVAL;
goto done;
}
if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
err = iso_listen_cis(sk);
else
err = iso_listen_bis(sk);
if (err)
goto done;
sk->sk_max_ack_backlog = backlog;
sk->sk_ack_backlog = 0;
sk->sk_state = BT_LISTEN;
done:
release_sock(sk);
return err;
}
static int iso_sock_accept(struct socket *sock, struct socket *newsock,
int flags, bool kern)
{
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct sock *sk = sock->sk, *ch;
long timeo;
int err = 0;
lock_sock(sk);
timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
BT_DBG("sk %p timeo %ld", sk, timeo);
/* Wait for an incoming connection. (wake-one). */
add_wait_queue_exclusive(sk_sleep(sk), &wait);
while (1) {
if (sk->sk_state != BT_LISTEN) {
err = -EBADFD;
break;
}
ch = bt_accept_dequeue(sk, newsock);
if (ch)
break;
if (!timeo) {
err = -EAGAIN;
break;
}
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
break;
}
release_sock(sk);
timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
lock_sock(sk);
}
remove_wait_queue(sk_sleep(sk), &wait);
if (err)
goto done;
newsock->state = SS_CONNECTED;
BT_DBG("new socket %p", ch);
done:
release_sock(sk);
return err;
}
static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
int peer)
{
struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
struct sock *sk = sock->sk;
BT_DBG("sock %p, sk %p", sock, sk);
addr->sa_family = AF_BLUETOOTH;
if (peer) {
bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
} else {
bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
sa->iso_bdaddr_type = iso_pi(sk)->src_type;
}
return sizeof(struct sockaddr_iso);
}
static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
size_t len)
{
struct sock *sk = sock->sk;
struct sk_buff *skb, **frag;
size_t mtu;
int err;
BT_DBG("sock %p, sk %p", sock, sk);
err = sock_error(sk);
if (err)
return err;
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
lock_sock(sk);
if (sk->sk_state != BT_CONNECTED) {
release_sock(sk);
return -ENOTCONN;
}
mtu = iso_pi(sk)->conn->hcon->hdev->iso_mtu;
release_sock(sk);
skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0);
if (IS_ERR(skb))
return PTR_ERR(skb);
len -= skb->len;
BT_DBG("skb %p len %d", sk, skb->len);
/* Continuation fragments */
frag = &skb_shinfo(skb)->frag_list;
while (len) {
struct sk_buff *tmp;
tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0);
if (IS_ERR(tmp)) {
kfree_skb(skb);
return PTR_ERR(tmp);
}
*frag = tmp;
len -= tmp->len;
skb->len += tmp->len;
skb->data_len += tmp->len;
BT_DBG("frag %p len %d", *frag, tmp->len);
frag = &(*frag)->next;
}
lock_sock(sk);
if (sk->sk_state == BT_CONNECTED)
err = iso_send_frame(sk, skb);
else
err = -ENOTCONN;
release_sock(sk);
if (err < 0)
kfree_skb(skb);
return err;
}
static void iso_conn_defer_accept(struct hci_conn *conn)
{
struct hci_cp_le_accept_cis cp;
struct hci_dev *hdev = conn->hdev;
BT_DBG("conn %p", conn);
conn->state = BT_CONFIG;
cp.handle = cpu_to_le16(conn->handle);
hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
}
static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
size_t len, int flags)
{
struct sock *sk = sock->sk;
struct iso_pinfo *pi = iso_pi(sk);
BT_DBG("sk %p", sk);
if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
lock_sock(sk);
switch (sk->sk_state) {
case BT_CONNECT2:
iso_conn_defer_accept(pi->conn->hcon);
sk->sk_state = BT_CONFIG;
release_sock(sk);
return 0;
case BT_CONNECT:
release_sock(sk);
return iso_connect_cis(sk);
default:
release_sock(sk);
break;
}
}
return bt_sock_recvmsg(sock, msg, len, flags);
}
static bool check_io_qos(struct bt_iso_io_qos *qos)
{
/* If no PHY is enable SDU must be 0 */
if (!qos->phy && qos->sdu)
return false;
if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
return false;
if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
return false;
if (qos->phy > BT_ISO_PHY_ANY)
return false;
return true;
}
static bool check_qos(struct bt_iso_qos *qos)
{
if (qos->sca > 0x07)
return false;
if (qos->packing > 0x01)
return false;
if (qos->framing > 0x01)
return false;
if (!check_io_qos(&qos->in))
return false;
if (!check_io_qos(&qos->out))
return false;
return true;
}
static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
int len, err = 0;
struct bt_iso_qos qos;
u32 opt;
BT_DBG("sk %p", sk);
lock_sock(sk);
switch (optname) {
case BT_DEFER_SETUP:
if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
err = -EINVAL;
break;
}
if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
err = -EFAULT;
break;
}
if (opt)
set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
else
clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
break;
case BT_ISO_QOS:
if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
sk->sk_state != BT_CONNECT2) {
err = -EINVAL;
break;
}
len = min_t(unsigned int, sizeof(qos), optlen);
if (len != sizeof(qos)) {
err = -EINVAL;
break;
}
memset(&qos, 0, sizeof(qos));
if (copy_from_sockptr(&qos, optval, len)) {
err = -EFAULT;
break;
}
if (!check_qos(&qos)) {
err = -EINVAL;
break;
}
iso_pi(sk)->qos = qos;
break;
case BT_ISO_BASE:
if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
sk->sk_state != BT_CONNECT2) {
err = -EINVAL;
break;
}
if (optlen > sizeof(iso_pi(sk)->base)) {
err = -EOVERFLOW;
break;
}
len = min_t(unsigned int, sizeof(iso_pi(sk)->base), optlen);
if (copy_from_sockptr(iso_pi(sk)->base, optval, len)) {
err = -EFAULT;
break;
}
iso_pi(sk)->base_len = len;
break;
default:
err = -ENOPROTOOPT;
break;
}
release_sock(sk);
return err;
}
static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
int len, err = 0;
struct bt_iso_qos *qos;
u8 base_len;
u8 *base;
BT_DBG("sk %p", sk);
if (get_user(len, optlen))
return -EFAULT;
lock_sock(sk);
switch (optname) {
case BT_DEFER_SETUP:
if (sk->sk_state == BT_CONNECTED) {
err = -EINVAL;
break;
}
if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
(u32 __user *)optval))
err = -EFAULT;
break;
case BT_ISO_QOS:
qos = iso_sock_get_qos(sk);
len = min_t(unsigned int, len, sizeof(*qos));
if (copy_to_user(optval, qos, len))
err = -EFAULT;
break;
case BT_ISO_BASE:
if (sk->sk_state == BT_CONNECTED) {
base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
base = iso_pi(sk)->conn->hcon->le_per_adv_data;
} else {
base_len = iso_pi(sk)->base_len;
base = iso_pi(sk)->base;
}
len = min_t(unsigned int, len, base_len);
if (copy_to_user(optval, base, len))
err = -EFAULT;
break;
default:
err = -ENOPROTOOPT;
break;
}
release_sock(sk);
return err;
}
static int iso_sock_shutdown(struct socket *sock, int how)
{
struct sock *sk = sock->sk;
int err = 0;
BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
if (!sk)
return 0;
sock_hold(sk);
lock_sock(sk);
switch (how) {
case SHUT_RD:
if (sk->sk_shutdown & RCV_SHUTDOWN)
goto unlock;
sk->sk_shutdown |= RCV_SHUTDOWN;
break;
case SHUT_WR:
if (sk->sk_shutdown & SEND_SHUTDOWN)
goto unlock;
sk->sk_shutdown |= SEND_SHUTDOWN;
break;
case SHUT_RDWR:
if (sk->sk_shutdown & SHUTDOWN_MASK)
goto unlock;
sk->sk_shutdown |= SHUTDOWN_MASK;
break;
}
iso_sock_clear_timer(sk);
__iso_sock_close(sk);
if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
!(current->flags & PF_EXITING))
err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
unlock:
release_sock(sk);
sock_put(sk);
return err;
}
static int iso_sock_release(struct socket *sock)
{
struct sock *sk = sock->sk;
int err = 0;
BT_DBG("sock %p, sk %p", sock, sk);
if (!sk)
return 0;
iso_sock_close(sk);
if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
!(current->flags & PF_EXITING)) {
lock_sock(sk);
err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
release_sock(sk);
}
sock_orphan(sk);
iso_sock_kill(sk);
return err;
}
static void iso_sock_ready(struct sock *sk)
{
BT_DBG("sk %p", sk);
if (!sk)
return;
lock_sock(sk);
iso_sock_clear_timer(sk);
sk->sk_state = BT_CONNECTED;
sk->sk_state_change(sk);
release_sock(sk);
}
struct iso_list_data {
struct hci_conn *hcon;
int count;
};
static bool iso_match_big(struct sock *sk, void *data)
{
struct hci_evt_le_big_sync_estabilished *ev = data;
return ev->handle == iso_pi(sk)->qos.big;
}
static void iso_conn_ready(struct iso_conn *conn)
{
struct sock *parent;
struct sock *sk = conn->sk;
struct hci_ev_le_big_sync_estabilished *ev;
struct hci_conn *hcon;
BT_DBG("conn %p", conn);
if (sk) {
iso_sock_ready(conn->sk);
} else {
hcon = conn->hcon;
if (!hcon)
return;
ev = hci_recv_event_data(hcon->hdev,
HCI_EVT_LE_BIG_SYNC_ESTABILISHED);
if (ev)
parent = iso_get_sock_listen(&hcon->src,
&hcon->dst,
iso_match_big, ev);
else
parent = iso_get_sock_listen(&hcon->src,
BDADDR_ANY, NULL, NULL);
if (!parent)
return;
lock_sock(parent);
sk = iso_sock_alloc(sock_net(parent), NULL,
BTPROTO_ISO, GFP_ATOMIC, 0);
if (!sk) {
release_sock(parent);
return;
}
iso_sock_init(sk, parent);
bacpy(&iso_pi(sk)->src, &hcon->src);
iso_pi(sk)->src_type = hcon->src_type;
/* If hcon has no destination address (BDADDR_ANY) it means it
* was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED so we need to
* initialize using the parent socket destination address.
*/
if (!bacmp(&hcon->dst, BDADDR_ANY)) {
bacpy(&hcon->dst, &iso_pi(parent)->dst);
hcon->dst_type = iso_pi(parent)->dst_type;
hcon->sync_handle = iso_pi(parent)->sync_handle;
}
bacpy(&iso_pi(sk)->dst, &hcon->dst);
iso_pi(sk)->dst_type = hcon->dst_type;
hci_conn_hold(hcon);
iso_chan_add(conn, sk, parent);
if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
sk->sk_state = BT_CONNECT2;
else
sk->sk_state = BT_CONNECTED;
/* Wake up parent */
parent->sk_data_ready(parent);
release_sock(parent);
}
}
static bool iso_match_sid(struct sock *sk, void *data)
{
struct hci_ev_le_pa_sync_established *ev = data;
return ev->sid == iso_pi(sk)->bc_sid;
}
static bool iso_match_sync_handle(struct sock *sk, void *data)
{
struct hci_evt_le_big_info_adv_report *ev = data;
return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
}
/* ----- ISO interface with lower layer (HCI) ----- */
int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
{
struct hci_ev_le_pa_sync_established *ev1;
struct hci_evt_le_big_info_adv_report *ev2;
struct sock *sk;
int lm = 0;
bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
/* Broadcast receiver requires handling of some events before it can
* proceed to establishing a BIG sync:
*
* 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
* SID to listen to and once sync is estabilished its handle needs to
* be stored in iso_pi(sk)->sync_handle so it can be matched once
* receiving the BIG Info.
* 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
* a BIG Info it attempts to check if there any listening socket with
* the same sync_handle and if it does then attempt to create a sync.
*/
ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
if (ev1) {
sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr, iso_match_sid,
ev1);
if (sk)
iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
goto done;
}
ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
if (ev2) {
sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
iso_match_sync_handle, ev2);
if (sk) {
int err;
if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
iso_pi(sk)->bc_num_bis = ev2->num_bis;
err = hci_le_big_create_sync(hdev,
&iso_pi(sk)->qos,
iso_pi(sk)->sync_handle,
iso_pi(sk)->bc_num_bis,
iso_pi(sk)->bc_bis);
if (err) {
bt_dev_err(hdev, "hci_le_big_create_sync: %d",
err);
sk = NULL;
}
}
} else {
sk = iso_get_sock_listen(&hdev->bdaddr, BDADDR_ANY, NULL, NULL);
}
done:
if (!sk)
return lm;
lm |= HCI_LM_ACCEPT;
if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
*flags |= HCI_PROTO_DEFER;
return lm;
}
static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
{
if (hcon->type != ISO_LINK) {
if (hcon->type != LE_LINK)
return;
/* Check if LE link has failed */
if (status) {
if (hcon->link)
iso_conn_del(hcon->link, bt_to_errno(status));
return;
}
/* Create CIS if pending */
hci_le_create_cis(hcon);
return;
}
BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
if (!status) {
struct iso_conn *conn;
conn = iso_conn_add(hcon);
if (conn)
iso_conn_ready(conn);
} else {
iso_conn_del(hcon, bt_to_errno(status));
}
}
static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
{
if (hcon->type != ISO_LINK)
return;
BT_DBG("hcon %p reason %d", hcon, reason);
iso_conn_del(hcon, bt_to_errno(reason));
}
void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
{
struct iso_conn *conn = hcon->iso_data;
__u16 pb, ts, len;
if (!conn)
goto drop;
pb = hci_iso_flags_pb(flags);
ts = hci_iso_flags_ts(flags);
BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
switch (pb) {
case ISO_START:
case ISO_SINGLE:
if (conn->rx_len) {
BT_ERR("Unexpected start frame (len %d)", skb->len);
kfree_skb(conn->rx_skb);
conn->rx_skb = NULL;
conn->rx_len = 0;
}
if (ts) {
struct hci_iso_ts_data_hdr *hdr;
/* TODO: add timestamp to the packet? */
hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
if (!hdr) {
BT_ERR("Frame is too short (len %d)", skb->len);
goto drop;
}
len = __le16_to_cpu(hdr->slen);
} else {
struct hci_iso_data_hdr *hdr;
hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
if (!hdr) {
BT_ERR("Frame is too short (len %d)", skb->len);
goto drop;
}
len = __le16_to_cpu(hdr->slen);
}
flags = hci_iso_data_flags(len);
len = hci_iso_data_len(len);
BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
skb->len, flags);
if (len == skb->len) {
/* Complete frame received */
iso_recv_frame(conn, skb);
return;
}
if (pb == ISO_SINGLE) {
BT_ERR("Frame malformed (len %d, expected len %d)",
skb->len, len);
goto drop;
}
if (skb->len > len) {
BT_ERR("Frame is too long (len %d, expected len %d)",
skb->len, len);
goto drop;
}
/* Allocate skb for the complete frame (with header) */
conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
if (!conn->rx_skb)
goto drop;
skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
skb->len);
conn->rx_len = len - skb->len;
break;
case ISO_CONT:
BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
conn->rx_len);
if (!conn->rx_len) {
BT_ERR("Unexpected continuation frame (len %d)",
skb->len);
goto drop;
}
if (skb->len > conn->rx_len) {
BT_ERR("Fragment is too long (len %d, expected %d)",
skb->len, conn->rx_len);
kfree_skb(conn->rx_skb);
conn->rx_skb = NULL;
conn->rx_len = 0;
goto drop;
}
skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
skb->len);
conn->rx_len -= skb->len;
return;
case ISO_END:
skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
skb->len);
conn->rx_len -= skb->len;
if (!conn->rx_len) {
struct sk_buff *rx_skb = conn->rx_skb;
/* Complete frame received. iso_recv_frame
* takes ownership of the skb so set the global
* rx_skb pointer to NULL first.
*/
conn->rx_skb = NULL;
iso_recv_frame(conn, rx_skb);
}
break;
}
drop:
kfree_skb(skb);
}
static struct hci_cb iso_cb = {
.name = "ISO",
.connect_cfm = iso_connect_cfm,
.disconn_cfm = iso_disconn_cfm,
};
static int iso_debugfs_show(struct seq_file *f, void *p)
{
struct sock *sk;
read_lock(&iso_sk_list.lock);
sk_for_each(sk, &iso_sk_list.head) {
seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
&iso_pi(sk)->dst, sk->sk_state);
}
read_unlock(&iso_sk_list.lock);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
static struct dentry *iso_debugfs;
static const struct proto_ops iso_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = iso_sock_release,
.bind = iso_sock_bind,
.connect = iso_sock_connect,
.listen = iso_sock_listen,
.accept = iso_sock_accept,
.getname = iso_sock_getname,
.sendmsg = iso_sock_sendmsg,
.recvmsg = iso_sock_recvmsg,
.poll = bt_sock_poll,
.ioctl = bt_sock_ioctl,
.mmap = sock_no_mmap,
.socketpair = sock_no_socketpair,
.shutdown = iso_sock_shutdown,
.setsockopt = iso_sock_setsockopt,
.getsockopt = iso_sock_getsockopt
};
static const struct net_proto_family iso_sock_family_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.create = iso_sock_create,
};
static bool iso_inited;
bool iso_enabled(void)
{
return iso_inited;
}
int iso_init(void)
{
int err;
BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
if (iso_inited)
return -EALREADY;
err = proto_register(&iso_proto, 0);
if (err < 0)
return err;
err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
if (err < 0) {
BT_ERR("ISO socket registration failed");
goto error;
}
err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
if (err < 0) {
BT_ERR("Failed to create ISO proc file");
bt_sock_unregister(BTPROTO_ISO);
goto error;
}
BT_INFO("ISO socket layer initialized");
hci_register_cb(&iso_cb);
if (IS_ERR_OR_NULL(bt_debugfs))
return 0;
if (!iso_debugfs) {
iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
NULL, &iso_debugfs_fops);
}
iso_inited = true;
return 0;
error:
proto_unregister(&iso_proto);
return err;
}
int iso_exit(void)
{
if (!iso_inited)
return -EALREADY;
bt_procfs_cleanup(&init_net, "iso");
debugfs_remove(iso_debugfs);
iso_debugfs = NULL;
hci_unregister_cb(&iso_cb);
bt_sock_unregister(BTPROTO_ISO);
proto_unregister(&iso_proto);
iso_inited = false;
return 0;
}