X-Git-Url: http://rtime.felk.cvut.cz/gitweb/socketcan-devel.git/blobdiff_plain/af24ff95b4f16087e3d226af157533c7e8d6fefe..c214d1a46a37635c06c68756baa383b3ac5996ca:/kernel/2.6/include/socketcan/can/gw.h

diff --git a/kernel/2.6/include/socketcan/can/gw.h b/kernel/2.6/include/socketcan/can/gw.h
index 5a963ed..e1dfac0 100644
--- a/kernel/2.6/include/socketcan/can/gw.h
+++ b/kernel/2.6/include/socketcan/can/gw.h
@@ -1,12 +1,12 @@
 /*
  * socketcan/can/gw.h
  *
- * Definitions for CAN frame Gateway/Router/Bridge 
+ * Definitions for CAN frame Gateway/Router/Bridge
  *
  * $Id$
  *
  * Author: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
- * Copyright (c) 2002-2010 Volkswagen Group Electronic Research
+ * Copyright (c) 2011 Volkswagen Group Electronic Research
  * All rights reserved.
  *
  * Send feedback to <socketcan-users@lists.berlios.de>
@@ -16,34 +16,46 @@
 #ifndef CAN_GW_H
 #define CAN_GW_H
 
+#include <linux/types.h>
 #include <socketcan/can.h>
 
 struct rtcanmsg {
 	__u8  can_family;
-	__u8  can_txflags;
-	__u16 pad;
-	__u32 src_ifindex;
-	__u32 dst_ifindex;
+	__u8  gwtype;
+	__u16 flags;
 };
 
-#define CAN_GW_TXFLAGS_ECHO 0x01
-#define CAN_GW_TXFLAGS_SRC_TSTAMP 0x02
+/* CAN gateway types */
+enum {
+	CGW_TYPE_UNSPEC,
+	CGW_TYPE_CAN_CAN,	/* CAN->CAN routing */
+	__CGW_TYPE_MAX
+};
+
+#define CGW_TYPE_MAX (__CGW_TYPE_MAX - 1)
 
 /* CAN rtnetlink attribute definitions */
 enum {
 	CGW_UNSPEC,
-	CGW_FILTER,	/* specify struct can_filter on source CAN device */
 	CGW_MOD_AND,	/* CAN frame modification binary AND */
 	CGW_MOD_OR,	/* CAN frame modification binary OR */
 	CGW_MOD_XOR,	/* CAN frame modification binary XOR */
 	CGW_MOD_SET,	/* CAN frame modification set alternate values */
+	CGW_CS_XOR,	/* set data[] XOR checksum into data[index] */
+	CGW_CS_CRC8,	/* set data[] CRC8 checksum into data[index] */
 	CGW_HANDLED,	/* number of handled CAN frames */
 	CGW_DROPPED,	/* number of dropped CAN frames */
+	CGW_SRC_IF,	/* ifindex of source network interface */
+	CGW_DST_IF,	/* ifindex of destination network interface */
+	CGW_FILTER,	/* specify struct can_filter on source CAN device */
 	__CGW_MAX
 };
 
 #define CGW_MAX (__CGW_MAX - 1)
 
+#define CGW_FLAGS_CAN_ECHO 0x01
+#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
+
 #define CGW_MOD_FUNCS 4 /* AND OR XOR SET */
 
 /* CAN frame elements that are affected by curr. 3 CAN frame modifications */
@@ -55,11 +67,53 @@ enum {
 
 #define MAX_MODFUNCTIONS (CGW_MOD_FUNCS * CGW_FRAME_MODS)
 
-#define CGW_MODATTR_LEN (sizeof(struct can_frame) + 1)
+struct cgw_frame_mod {
+	struct can_frame cf;
+	__u8 modtype;
+} __attribute__((packed));
+
+#define CGW_MODATTR_LEN sizeof(struct cgw_frame_mod)
+
+struct cgw_csum_xor {
+	__s8 from_idx;
+	__s8 to_idx;
+	__s8 result_idx;
+	__u8 init_xor_val;
+} __attribute__((packed));
+
+struct cgw_csum_crc8 {
+	__s8 from_idx;
+	__s8 to_idx;
+	__s8 result_idx;
+	__u8 init_crc_val;
+	__u8 final_xor_val;
+	__u8 crctab[256];
+	__u8 profile;
+	__u8 profile_data[20];
+} __attribute__((packed));
+
+/* length of checksum operation parameters. idx = index in CAN frame data[] */
+#define CGW_CS_XOR_LEN  sizeof(struct cgw_csum_xor)
+#define CGW_CS_CRC8_LEN  sizeof(struct cgw_csum_crc8)
+
+/* CRC8 profiles (compute CRC for additional data elements - see below) */
+enum {
+	CGW_CRC8PRF_UNSPEC,
+	CGW_CRC8PRF_1U8,	/* compute one additional u8 value */
+	CGW_CRC8PRF_16U8,	/* u8 value table indexed by data[1] & 0xF */
+	CGW_CRC8PRF_SFFID_XOR,	/* (can_id & 0xFF) ^ (can_id >> 8 & 0xFF) */
+	__CGW_CRC8PRF_MAX
+};
+
+#define CGW_CRC8PRF_MAX (__CGW_CRC8PRF_MAX - 1)
 
 /*
  * CAN rtnetlink attribute contents in detail
  *
+ * CGW_XXX_IF (length 4 bytes):
+ * Sets an interface index for source/destination network interfaces.
+ * For the CAN->CAN gwtype the indices of _two_ CAN interfaces are mandatory.
+ *
  * CGW_FILTER (length 8 bytes):
  * Sets a CAN receive filter for the gateway job specified by the
  * struct can_filter described in include/linux/can.h
@@ -71,7 +125,42 @@ enum {
  * <struct can_frame> data used as operator
  * <u8> affected CAN frame elements
  *
- * Remark: The attribute data is a linear buffer. Beware of sending structs!
+ * CGW_CS_XOR (length 4 bytes):
+ * Set a simple XOR checksum starting with an initial value into
+ * data[result-idx] using data[start-idx] .. data[end-idx]
+ *
+ * The XOR checksum is calculated like this:
+ *
+ * xor = init_xor_val
+ *
+ * for (i = from_idx .. to_idx)
+ *      xor ^= can_frame.data[i]
+ *
+ * can_frame.data[ result_idx ] = xor
+ *
+ * CGW_CS_CRC8 (length 282 bytes):
+ * Set a CRC8 value into data[result-idx] using a given 256 byte CRC8 table,
+ * a given initial value and a defined input data[start-idx] .. data[end-idx].
+ * Finally the result value is XOR'ed with the final_xor_val.
+ *
+ * The CRC8 checksum is calculated like this:
+ *
+ * crc = init_crc_val
+ *
+ * for (i = from_idx .. to_idx)
+ *      crc = crctab[ crc ^ can_frame.data[i] ]
+ *
+ * can_frame.data[ result_idx ] = crc ^ final_xor_val
+ *
+ * The calculated CRC may contain additional source data elements that can be
+ * defined in the handling of 'checksum profiles' e.g. shown in AUTOSAR specs
+ * like http://www.autosar.org/download/R4.0/AUTOSAR_SWS_E2ELibrary.pdf
+ * E.g. the profile_data[] may contain additional u8 values (called DATA_IDs)
+ * that are used depending on counter values inside the CAN frame data[].
+ * So far only three profiles have been implemented for illustration.
+ *
+ * Remark: In general the attribute data is a linear buffer.
+ *         Beware of sending unpacked or aligned structs!
  */
 
 #endif