Bluetooth: Add support for L2CAP 'Send RRorRNR' action

When called, 'Send RRorRNR' should send a RNR frame if local device is
busy or a RR frame otherwise.

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 14 insertions, 6 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 40fbf5cb1f7e..b03012564647 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -366,6 +366,16 @@ static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
         return hci_send_acl(pi->conn->hcon, skb, 0);
 }
 
+static inline int l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
+{
+        if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY)
+                control |= L2CAP_SUPER_RCV_NOT_READY;
+        else
+                control |= L2CAP_SUPER_RCV_READY;
+
+        return l2cap_send_sframe(pi, control);
+}
+
 static void l2cap_do_start(struct sock *sk)
 {
         struct l2cap_conn *conn = l2cap_pi(sk)->conn;
@@ -1202,8 +1212,7 @@ static void l2cap_monitor_timeout(unsigned long arg)
         __mod_monitor_timer();
 
         control = L2CAP_CTRL_POLL;
-        control |= L2CAP_SUPER_RCV_READY;
-        l2cap_send_sframe(l2cap_pi(sk), control);
+        l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
         bh_unlock_sock(sk);
 }
 
@@ -1219,8 +1228,7 @@ static void l2cap_retrans_timeout(unsigned long arg)
         l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
 
         control = L2CAP_CTRL_POLL;
-        control |= L2CAP_SUPER_RCV_READY;
-        l2cap_send_sframe(l2cap_pi(sk), control);
+        l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
         bh_unlock_sock(sk);
 }
 
@@ -3428,8 +3436,8 @@ static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, str
 
                 del_timer(&l2cap_pi(sk)->retrans_timer);
                 if (rx_control & L2CAP_CTRL_POLL) {
-                        u16 control = L2CAP_CTRL_FINAL | L2CAP_SUPER_RCV_READY;
-                        l2cap_send_sframe(l2cap_pi(sk), control);
+                        u16 control = L2CAP_CTRL_FINAL;
+                        l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
                 }
                 break;
         }