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-rw-r--r--net/can/isotp.c110
1 files changed, 81 insertions, 29 deletions
diff --git a/net/can/isotp.c b/net/can/isotp.c
index 9f94ad3caee9..be6183f8ca11 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -143,10 +143,14 @@ struct isotp_sock {
u32 force_tx_stmin;
u32 force_rx_stmin;
struct tpcon rx, tx;
- struct notifier_block notifier;
+ struct list_head notifier;
wait_queue_head_t wait;
};
+static LIST_HEAD(isotp_notifier_list);
+static DEFINE_SPINLOCK(isotp_notifier_lock);
+static struct isotp_sock *isotp_busy_notifier;
+
static inline struct isotp_sock *isotp_sk(const struct sock *sk)
{
return (struct isotp_sock *)sk;
@@ -1013,7 +1017,14 @@ static int isotp_release(struct socket *sock)
/* wait for complete transmission of current pdu */
wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
- unregister_netdevice_notifier(&so->notifier);
+ spin_lock(&isotp_notifier_lock);
+ while (isotp_busy_notifier == so) {
+ spin_unlock(&isotp_notifier_lock);
+ schedule_timeout_uninterruptible(1);
+ spin_lock(&isotp_notifier_lock);
+ }
+ list_del(&so->notifier);
+ spin_unlock(&isotp_notifier_lock);
lock_sock(sk);
@@ -1062,27 +1073,31 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
if (len < ISOTP_MIN_NAMELEN)
return -EINVAL;
+ if (addr->can_addr.tp.tx_id & (CAN_ERR_FLAG | CAN_RTR_FLAG))
+ return -EADDRNOTAVAIL;
+
+ if (!addr->can_ifindex)
+ return -ENODEV;
+
+ lock_sock(sk);
+
/* do not register frame reception for functional addressing */
if (so->opt.flags & CAN_ISOTP_SF_BROADCAST)
do_rx_reg = 0;
/* do not validate rx address for functional addressing */
if (do_rx_reg) {
- if (addr->can_addr.tp.rx_id == addr->can_addr.tp.tx_id)
- return -EADDRNOTAVAIL;
+ if (addr->can_addr.tp.rx_id == addr->can_addr.tp.tx_id) {
+ err = -EADDRNOTAVAIL;
+ goto out;
+ }
- if (addr->can_addr.tp.rx_id & (CAN_ERR_FLAG | CAN_RTR_FLAG))
- return -EADDRNOTAVAIL;
+ if (addr->can_addr.tp.rx_id & (CAN_ERR_FLAG | CAN_RTR_FLAG)) {
+ err = -EADDRNOTAVAIL;
+ goto out;
+ }
}
- if (addr->can_addr.tp.tx_id & (CAN_ERR_FLAG | CAN_RTR_FLAG))
- return -EADDRNOTAVAIL;
-
- if (!addr->can_ifindex)
- return -ENODEV;
-
- lock_sock(sk);
-
if (so->bound && addr->can_ifindex == so->ifindex &&
addr->can_addr.tp.rx_id == so->rxid &&
addr->can_addr.tp.tx_id == so->txid)
@@ -1164,16 +1179,13 @@ static int isotp_getname(struct socket *sock, struct sockaddr *uaddr, int peer)
return ISOTP_MIN_NAMELEN;
}
-static int isotp_setsockopt(struct socket *sock, int level, int optname,
+static int isotp_setsockopt_locked(struct socket *sock, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
struct isotp_sock *so = isotp_sk(sk);
int ret = 0;
- if (level != SOL_CAN_ISOTP)
- return -EINVAL;
-
if (so->bound)
return -EISCONN;
@@ -1248,6 +1260,22 @@ static int isotp_setsockopt(struct socket *sock, int level, int optname,
return ret;
}
+static int isotp_setsockopt(struct socket *sock, int level, int optname,
+ sockptr_t optval, unsigned int optlen)
+
+{
+ struct sock *sk = sock->sk;
+ int ret;
+
+ if (level != SOL_CAN_ISOTP)
+ return -EINVAL;
+
+ lock_sock(sk);
+ ret = isotp_setsockopt_locked(sock, level, optname, optval, optlen);
+ release_sock(sk);
+ return ret;
+}
+
static int isotp_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
@@ -1300,21 +1328,16 @@ static int isotp_getsockopt(struct socket *sock, int level, int optname,
return 0;
}
-static int isotp_notifier(struct notifier_block *nb, unsigned long msg,
- void *ptr)
+static void isotp_notify(struct isotp_sock *so, unsigned long msg,
+ struct net_device *dev)
{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- struct isotp_sock *so = container_of(nb, struct isotp_sock, notifier);
struct sock *sk = &so->sk;
if (!net_eq(dev_net(dev), sock_net(sk)))
- return NOTIFY_DONE;
-
- if (dev->type != ARPHRD_CAN)
- return NOTIFY_DONE;
+ return;
if (so->ifindex != dev->ifindex)
- return NOTIFY_DONE;
+ return;
switch (msg) {
case NETDEV_UNREGISTER:
@@ -1340,7 +1363,28 @@ static int isotp_notifier(struct notifier_block *nb, unsigned long msg,
sk->sk_error_report(sk);
break;
}
+}
+
+static int isotp_notifier(struct notifier_block *nb, unsigned long msg,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ if (dev->type != ARPHRD_CAN)
+ return NOTIFY_DONE;
+ if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
+ return NOTIFY_DONE;
+ if (unlikely(isotp_busy_notifier)) /* Check for reentrant bug. */
+ return NOTIFY_DONE;
+
+ spin_lock(&isotp_notifier_lock);
+ list_for_each_entry(isotp_busy_notifier, &isotp_notifier_list, notifier) {
+ spin_unlock(&isotp_notifier_lock);
+ isotp_notify(isotp_busy_notifier, msg, dev);
+ spin_lock(&isotp_notifier_lock);
+ }
+ isotp_busy_notifier = NULL;
+ spin_unlock(&isotp_notifier_lock);
return NOTIFY_DONE;
}
@@ -1377,8 +1421,9 @@ static int isotp_init(struct sock *sk)
init_waitqueue_head(&so->wait);
- so->notifier.notifier_call = isotp_notifier;
- register_netdevice_notifier(&so->notifier);
+ spin_lock(&isotp_notifier_lock);
+ list_add_tail(&so->notifier, &isotp_notifier_list);
+ spin_unlock(&isotp_notifier_lock);
return 0;
}
@@ -1425,6 +1470,10 @@ static const struct can_proto isotp_can_proto = {
.prot = &isotp_proto,
};
+static struct notifier_block canisotp_notifier = {
+ .notifier_call = isotp_notifier
+};
+
static __init int isotp_module_init(void)
{
int err;
@@ -1434,6 +1483,8 @@ static __init int isotp_module_init(void)
err = can_proto_register(&isotp_can_proto);
if (err < 0)
pr_err("can: registration of isotp protocol failed\n");
+ else
+ register_netdevice_notifier(&canisotp_notifier);
return err;
}
@@ -1441,6 +1492,7 @@ static __init int isotp_module_init(void)
static __exit void isotp_module_exit(void)
{
can_proto_unregister(&isotp_can_proto);
+ unregister_netdevice_notifier(&canisotp_notifier);
}
module_init(isotp_module_init);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-14 01:24:17 +0000