[Bluetooth] Fall back to L2CAP in basic mode

In case the remote entity tries to negogiate retransmission or flow
control mode, reject it and fall back to basic mode.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index e1ea64085c4f..73e115bc12dd 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -149,6 +149,19 @@ struct l2cap_conf_opt {
 
 #define L2CAP_CONF_MAX_SIZE     22
 
+struct l2cap_conf_rfc {
+        __u8       mode;
+        __u8       txwin_size;
+        __u8       max_transmit;
+        __le16     retrans_timeout;
+        __le16     monitor_timeout;
+        __le16     max_pdu_size;
+} __attribute__ ((packed));
+
+#define L2CAP_MODE_BASIC        0x00
+#define L2CAP_MODE_RETRANS      0x01
+#define L2CAP_MODE_FLOWCTL      0x02
+
 struct l2cap_disconn_req {
         __le16     dcid;
         __le16     scid;