1/* 2 * cls_cgroup.h Control Group Classifier 3 * 4 * Authors: Thomas Graf <tgraf@suug.ch> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13#ifndef _NET_CLS_CGROUP_H 14#define _NET_CLS_CGROUP_H 15 16#include <linux/cgroup.h> 17#include <linux/hardirq.h> 18#include <linux/rcupdate.h> 19 20#ifdef CONFIG_CGROUPS 21struct cgroup_cls_state 22{ 23 struct cgroup_subsys_state css; 24 u32 classid; 25}; 26 27#ifdef CONFIG_NET_CLS_CGROUP 28static inline u32 task_cls_classid(struct task_struct *p) 29{ 30 int classid; 31 32 if (in_interrupt()) 33 return 0; 34 35 rcu_read_lock(); 36 classid = container_of(task_subsys_state(p, net_cls_subsys_id), 37 struct cgroup_cls_state, css)->classid; 38 rcu_read_unlock(); 39 40 return classid; 41} 42#else 43extern int net_cls_subsys_id; 44 45static inline u32 task_cls_classid(struct task_struct *p) 46{ 47 int id; 48 u32 classid = 0; 49 50 if (in_interrupt()) 51 return 0; 52 53 rcu_read_lock(); 54 id = rcu_dereference(net_cls_subsys_id); 55 if (id >= 0) 56 classid = container_of(task_subsys_state(p, id), 57 struct cgroup_cls_state, css)->classid; 58 rcu_read_unlock(); 59 60 return classid; 61} 62#endif 63#else 64static inline u32 task_cls_classid(struct task_struct *p) 65{ 66 return 0; 67} 68#endif 69#endif /* _NET_CLS_CGROUP_H */ 70