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 21 struct cgroup_cls_state 22 { 23 struct cgroup_subsys_state css; 24 u32 classid; 25 }; 26 27 #ifdef CONFIG_NET_CLS_CGROUP 28 static 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 43 extern int net_cls_subsys_id; 44 45 static 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_index_check(net_cls_subsys_id, 55 rcu_read_lock_held()); 56 if (id >= 0) 57 classid = container_of(task_subsys_state(p, id), 58 struct cgroup_cls_state, css)->classid; 59 rcu_read_unlock(); 60 61 return classid; 62 } 63 #endif 64 #else 65 static inline u32 task_cls_classid(struct task_struct *p) 66 { 67 return 0; 68 } 69 #endif 70 #endif /* _NET_CLS_CGROUP_H */ 71