In case an unbound HCI raw socket is later on bound, ensure that the
monitor notification messages indicate a close and re-open. None of
the userspace tools use the socket this, but it is actually possible
to use an ioctl on an unbound socket and then later bind it.
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
---
net/bluetooth/hci_sock.c | 53 ++++++++++++++++++++++++++++++++----------------
1 file changed, 36 insertions(+), 17 deletions(-)
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index c2b2b1d7fe4d..f2c597facf0c 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1049,6 +1049,7 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
struct sockaddr_hci haddr;
struct sock *sk = sock->sk;
struct hci_dev *hdev = NULL;
+ struct sk_buff *skb;
int len, err = 0;
BT_DBG("sock %p sk %p", sock, sk);
@@ -1088,27 +1089,34 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
}
hci_pi(sk)->channel = haddr.hci_channel;
- hci_pi(sk)->hdev = hdev;
-
- /* Only send the event to monitor when a new cookie has
- * been generated. An existing cookie means that an unbound
- * socket has seen an ioctl and that triggered the cookie
- * generation and sending of the monitor event.
- */
- if (hci_sock_gen_cookie(sk)) {
- struct sk_buff *skb;
-
- if (capable(CAP_NET_ADMIN))
- hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
- /* Send event to monitor */
- skb = create_monitor_ctrl_open(sk);
+ if (!hci_sock_gen_cookie(sk)) {
+ /* In the case when a cookie has already been assigned,
+ * then there has been already an ioctl issued against
+ * an unbound socket and with that triggerd an open
+ * notification. Send a close notification first to
+ * allow the state transition to bounded.
+ */
+ skb = create_monitor_ctrl_close(sk);
if (skb) {
hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
HCI_SOCK_TRUSTED, NULL);
kfree_skb(skb);
}
}
+
+ if (capable(CAP_NET_ADMIN))
+ hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
+
+ hci_pi(sk)->hdev = hdev;
+
+ /* Send event to monitor */
+ skb = create_monitor_ctrl_open(sk);
+ if (skb) {
+ hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
+ HCI_SOCK_TRUSTED, NULL);
+ kfree_skb(skb);
+ }
break;
case HCI_CHANNEL_USER:
@@ -1251,9 +1259,20 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
* are changes to settings, class of device, name etc.
*/
if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) {
- struct sk_buff *skb;
-
- hci_sock_gen_cookie(sk);
+ if (!hci_sock_gen_cookie(sk)) {
+ /* In the case when a cookie has already been
+ * assigned, this socket will transtion from
+ * a raw socket into a control socket. To
+ * allow for a clean transtion, send the
+ * close notification first.
+ */
+ skb = create_monitor_ctrl_close(sk);
+ if (skb) {
+ hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
+ HCI_SOCK_TRUSTED, NULL);
+ kfree_skb(skb);
+ }
+ }
/* Send event to monitor */
skb = create_monitor_ctrl_open(sk);
--
2.7.4
--
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