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 #if IS_ENABLED(CONFIG_NET_CLS_CGROUP) 21 struct cgroup_cls_state 22 { 23 struct cgroup_subsys_state css; 24 u32 classid; 25 }; 26 27 extern void sock_update_classid(struct sock *sk); 28 29 #if IS_BUILTIN(CONFIG_NET_CLS_CGROUP) 30 static inline u32 task_cls_classid(struct task_struct *p) 31 { 32 u32 classid; 33 34 if (in_interrupt()) 35 return 0; 36 37 rcu_read_lock(); 38 classid = container_of(task_subsys_state(p, net_cls_subsys_id), 39 struct cgroup_cls_state, css)->classid; 40 rcu_read_unlock(); 41 42 return classid; 43 } 44 #elif IS_MODULE(CONFIG_NET_CLS_CGROUP) 45 static inline u32 task_cls_classid(struct task_struct *p) 46 { 47 struct cgroup_subsys_state *css; 48 u32 classid = 0; 49 50 if (in_interrupt()) 51 return 0; 52 53 rcu_read_lock(); 54 css = task_subsys_state(p, net_cls_subsys_id); 55 if (css) 56 classid = container_of(css, 57 struct cgroup_cls_state, css)->classid; 58 rcu_read_unlock(); 59 60 return classid; 61 } 62 #endif 63 #else /* !CGROUP_NET_CLS_CGROUP */ 64 static inline void sock_update_classid(struct sock *sk) 65 { 66 } 67 68 static inline u32 task_cls_classid(struct task_struct *p) 69 { 70 return 0; 71 } 72 #endif /* CGROUP_NET_CLS_CGROUP */ 73 #endif /* _NET_CLS_CGROUP_H */ 74