Bluetooth: Fix rejected connection not disconnecting ACL link

When using DEFER_SETUP on a RFCOMM socket, a SABM frame triggers
authorization which when rejected send a DM response. This is fine
according to the RFCOMM spec:

    the responding implementation may replace the "proper" response
    on the Multiplexer Control channel with a DM frame, sent on the
    referenced DLCI to indicate that the DLCI is not open, and that
    the responder would not grant a request to open it later either.

But some stacks doesn't seems to cope with this leaving DLCI 0 open after
receiving DM frame.

To fix it properly a timer was introduced to rfcomm_session which is used
to set a timeout when the last active DLC of a session is unlinked, this
will give the remote stack some time to reply with a proper DISC frame on
DLCI 0 avoiding both sides sending DISC to each other on stacks that
follow the specification and taking care of those who don't by taking
down DLCI 0.

Signed-off-by: Luiz Augusto von Dentz <luiz.dentz@openbossa.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index 26af4854af64..25692bc0a342 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -244,6 +244,33 @@ static inline int rfcomm_check_security(struct rfcomm_dlc *d)
                                                                 auth_type);
 }
 
+static void rfcomm_session_timeout(unsigned long arg)
+{
+        struct rfcomm_session *s = (void *) arg;
+
+        BT_DBG("session %p state %ld", s, s->state);
+
+        set_bit(RFCOMM_TIMED_OUT, &s->flags);
+        rfcomm_session_put(s);
+        rfcomm_schedule(RFCOMM_SCHED_TIMEO);
+}
+
+static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
+{
+        BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
+
+        if (!mod_timer(&s->timer, jiffies + timeout))
+                rfcomm_session_hold(s);
+}
+
+static void rfcomm_session_clear_timer(struct rfcomm_session *s)
+{
+        BT_DBG("session %p state %ld", s, s->state);
+
+        if (timer_pending(&s->timer) && del_timer(&s->timer))
+                rfcomm_session_put(s);
+}
+
 /* ---- RFCOMM DLCs ---- */
 static void rfcomm_dlc_timeout(unsigned long arg)
 {
@@ -320,6 +347,7 @@ static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
 
         rfcomm_session_hold(s);
 
+        rfcomm_session_clear_timer(s);
         rfcomm_dlc_hold(d);
         list_add(&d->list, &s->dlcs);
         d->session = s;
@@ -335,6 +363,9 @@ static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
         d->session = NULL;
         rfcomm_dlc_put(d);
 
+        if (list_empty(&s->dlcs))
+                rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
+
         rfcomm_session_put(s);
 }
 
@@ -567,6 +598,8 @@ static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
 
         BT_DBG("session %p sock %p", s, sock);
 
+        setup_timer(&s->timer, rfcomm_session_timeout, (unsigned long) s);
+
         INIT_LIST_HEAD(&s->dlcs);
         s->state = state;
         s->sock  = sock;
@@ -598,6 +631,7 @@ static void rfcomm_session_del(struct rfcomm_session *s)
         if (state == BT_CONNECTED)
                 rfcomm_send_disc(s, 0);
 
+        rfcomm_session_clear_timer(s);
         sock_release(s->sock);
         kfree(s);
 
@@ -639,6 +673,7 @@ static void rfcomm_session_close(struct rfcomm_session *s, int err)
                 __rfcomm_dlc_close(d, err);
         }
 
+        rfcomm_session_clear_timer(s);
         rfcomm_session_put(s);
 }
 
@@ -1879,6 +1914,12 @@ static inline void rfcomm_process_sessions(void)
                 struct rfcomm_session *s;
                 s = list_entry(p, struct rfcomm_session, list);
 
+                if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
+                        s->state = BT_DISCONN;
+                        rfcomm_send_disc(s, 0);
+                        continue;
+                }
+
                 if (s->state == BT_LISTEN) {
                         rfcomm_accept_connection(s);
                         continue;