define offsetof() and container_of()

hlist.h

@@ -14,6 +14,18 @@
 #ifndef _HLIST_H
 #define _HLIST_H
 
+#ifndef offsetof
+#define offsetof(type, member) ((size_t) &((type *)0)->member)
+#endif
+
+#ifndef container_of
+#define container_of(ptr, type, member)					\
+({									\
+	const __typeof__(((type *) NULL)->member) *__mptr = (ptr);	\
+	(type *) ((char *) __mptr - offsetof(type, member));		\
+})
+#endif
+
 struct hlist_node {
 	struct hlist_node *next;
 };

utils.h

@@ -136,6 +136,14 @@ extern int get_ifoperstatus(const char *ifname, ifopstatus_t *opstatus);
 #define offsetof(type, member) ((size_t) &((type *)0)->member)
 #endif
 
+#ifndef container_of
+#define container_of(ptr, type, member)					\
+({									\
+	const __typeof__(((type *) NULL)->member) *__mptr = (ptr);	\
+	(type *) ((char *) __mptr - offsetof(type, member));		\
+})
+#endif
+
 #ifndef bit
 #define bit(_n)	(1 << (_n))
 #endif