tipc: introduce constants for tipc address validation

In this commit, we introduce defines for tipc address size,
offset and mask specification for Zone.Cluster.Node.
There is no functional change in this commit.

Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 4 deletions

diff --git a/include/uapi/linux/tipc.h b/include/uapi/linux/tipc.h
index 6f71b9b41595..bf049e8fe31b 100644
--- a/include/uapi/linux/tipc.h
+++ b/include/uapi/linux/tipc.h
@@ -60,26 +60,48 @@ struct tipc_name_seq {
         __u32 upper;
 };
 
+/* TIPC Address Size, Offset, Mask specification for Z.C.N
+ */
+#define TIPC_NODE_BITS          12
+#define TIPC_CLUSTER_BITS       12
+#define TIPC_ZONE_BITS          8
+
+#define TIPC_NODE_OFFSET        0
+#define TIPC_CLUSTER_OFFSET     TIPC_NODE_BITS
+#define TIPC_ZONE_OFFSET        (TIPC_CLUSTER_OFFSET + TIPC_CLUSTER_BITS)
+
+#define TIPC_NODE_SIZE          ((1UL << TIPC_NODE_BITS) - 1)
+#define TIPC_CLUSTER_SIZE       ((1UL << TIPC_CLUSTER_BITS) - 1)
+#define TIPC_ZONE_SIZE          ((1UL << TIPC_ZONE_BITS) - 1)
+
+#define TIPC_NODE_MASK          (TIPC_NODE_SIZE << TIPC_NODE_OFFSET)
+#define TIPC_CLUSTER_MASK       (TIPC_CLUSTER_SIZE << TIPC_CLUSTER_OFFSET)
+#define TIPC_ZONE_MASK          (TIPC_ZONE_SIZE << TIPC_ZONE_OFFSET)
+
+#define TIPC_ZONE_CLUSTER_MASK (TIPC_ZONE_MASK | TIPC_CLUSTER_MASK)
+
 static inline __u32 tipc_addr(unsigned int zone,
                               unsigned int cluster,
                               unsigned int node)
 {
-        return (zone << 24) | (cluster << 12) | node;
+        return (zone << TIPC_ZONE_OFFSET) |
+                (cluster << TIPC_CLUSTER_OFFSET) |
+                node;
 }
 
 static inline unsigned int tipc_zone(__u32 addr)
 {
-        return addr >> 24;
+        return addr >> TIPC_ZONE_OFFSET;
 }
 
 static inline unsigned int tipc_cluster(__u32 addr)
 {
-        return (addr >> 12) & 0xfff;
+        return (addr & TIPC_CLUSTER_MASK) >> TIPC_CLUSTER_OFFSET;
 }
 
 static inline unsigned int tipc_node(__u32 addr)
 {
-        return addr & 0xfff;
+        return addr & TIPC_NODE_MASK;
 }
 
 /*