1 files changed, 63 insertions, 0 deletions

diff --git a/include/net/cls_cgroup.h b/include/net/cls_cgroup.h
new file mode 100644
index 000000000000..726cc3536409
--- /dev/null
+++ b/include/net/cls_cgroup.h
@@ -0,0 +1,63 @@
+/*
+ * cls_cgroup.h                 Control Group Classifier
+ *
+ * Authors:     Thomas Graf <tgraf@suug.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#ifndef _NET_CLS_CGROUP_H
+#define _NET_CLS_CGROUP_H
+
+#include <linux/cgroup.h>
+#include <linux/hardirq.h>
+#include <linux/rcupdate.h>
+
+#ifdef CONFIG_CGROUPS
+struct cgroup_cls_state
+{
+        struct cgroup_subsys_state css;
+        u32 classid;
+};
+
+#ifdef CONFIG_NET_CLS_CGROUP
+static inline u32 task_cls_classid(struct task_struct *p)
+{
+        if (in_interrupt())
+                return 0;
+
+        return container_of(task_subsys_state(p, net_cls_subsys_id),
+                            struct cgroup_cls_state, css)->classid;
+}
+#else
+extern int net_cls_subsys_id;
+
+static inline u32 task_cls_classid(struct task_struct *p)
+{
+        int id;
+        u32 classid = 0;
+
+        if (in_interrupt())
+                return 0;
+
+        rcu_read_lock();
+        id = rcu_dereference(net_cls_subsys_id);
+        if (id >= 0)
+                classid = container_of(task_subsys_state(p, id),
+                                       struct cgroup_cls_state, css)->classid;
+        rcu_read_unlock();
+
+        return classid;
+}
+#endif
+#else
+static inline u32 task_cls_classid(struct task_struct *p)
+{
+        return 0;
+}
+#endif
+#endif  /* _NET_CLS_CGROUP_H */