Bluetooth: Add support for FCS option to L2CAP

Implement CRC16 check for L2CAP packets. FCS is used by Streaming Mode and
Enhanced Retransmission Mode and is a extra check for the packet content.

Using CRC16 is the default, L2CAP won't use FCS only when both side send
a "No FCS" request.

Initially based on a patch from Nathan Holstein <nathan@lampreynetworks.com>

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

1 files changed, 2 insertions, 0 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 2cf7003cb1b6..59b26bf10f30 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -54,6 +54,7 @@ struct l2cap_options {
         __u16 imtu;
         __u16 flush_to;
         __u8  mode;
+        __u8  fcs;
 };
 
 #define L2CAP_CONNINFO  0x02
@@ -348,6 +349,7 @@ struct l2cap_pinfo {
 #define L2CAP_CONF_MTU_DONE       0x08
 #define L2CAP_CONF_MODE_DONE      0x10
 #define L2CAP_CONF_CONNECT_PEND   0x20
+#define L2CAP_CONF_NO_FCS_RECV    0x40
 #define L2CAP_CONF_STATE2_DEVICE  0x80
 
 #define L2CAP_CONF_MAX_CONF_REQ 2