[CAN]: Add raw protocol

This patch adds the CAN raw protocol.

Signed-off-by: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
Signed-off-by: Urs Thuermann <urs.thuermann@volkswagen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Oliver Hartkopp

include/linux/can/raw.h

@@ -0,0 +1,31 @@
+/*
+ * linux/can/raw.h
+ *
+ * Definitions for raw CAN sockets
+ *
+ * Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
+ *          Urs Thuermann   <urs.thuermann@volkswagen.de>
+ * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
+ * All rights reserved.
+ *
+ * Send feedback to <socketcan-users@lists.berlios.de>
+ *
+ */
+
+#ifndef CAN_RAW_H
+#define CAN_RAW_H
+
+#include <linux/can.h>
+
+#define SOL_CAN_RAW (SOL_CAN_BASE + CAN_RAW)
+
+/* for socket options affecting the socket (not the global system) */
+
+enum {
+	CAN_RAW_FILTER = 1,	/* set 0 .. n can_filter(s)          */
+	CAN_RAW_ERR_FILTER,	/* set filter for error frames       */
+	CAN_RAW_LOOPBACK,	/* local loopback (default:on)       */
+	CAN_RAW_RECV_OWN_MSGS	/* receive my own msgs (default:off) */
+};
+
+#endif

net/can/Kconfig

@@ -15,3 +15,14 @@ menuconfig CAN
 
 	  If you want CAN support you should say Y here and also to the
 	  specific driver for your controller(s) below.
+
+config CAN_RAW
+	tristate "Raw CAN Protocol (raw access with CAN-ID filtering)"
+	depends on CAN
+	default N
+	---help---
+	  The raw CAN protocol option offers access to the CAN bus via
+	  the BSD socket API. You probably want to use the raw socket in
+	  most cases where no higher level protocol is being used. The raw
+	  socket has several filter options e.g. ID masking / error frames.
+	  To receive/send raw CAN messages, use AF_CAN with protocol CAN_RAW.

net/can/Makefile

@@ -4,3 +4,6 @@
 
 obj-$(CONFIG_CAN)	+= can.o
 can-objs		:= af_can.o proc.o
+
+obj-$(CONFIG_CAN_RAW)	+= can-raw.o
+can-raw-objs		:= raw.o