15f256becSEric W. Biederman /* 25f256becSEric W. Biederman * Operations on the network namespace 35f256becSEric W. Biederman */ 45f256becSEric W. Biederman #ifndef __NET_NET_NAMESPACE_H 55f256becSEric W. Biederman #define __NET_NET_NAMESPACE_H 65f256becSEric W. Biederman 75f256becSEric W. Biederman #include <asm/atomic.h> 85f256becSEric W. Biederman #include <linux/workqueue.h> 95f256becSEric W. Biederman #include <linux/list.h> 105f256becSEric W. Biederman 11457c4cbcSEric W. Biederman struct proc_dir_entry; 122774c7abSEric W. Biederman struct net_device; 135f256becSEric W. Biederman struct net { 145f256becSEric W. Biederman atomic_t count; /* To decided when the network 155f256becSEric W. Biederman * namespace should be freed. 165f256becSEric W. Biederman */ 175f256becSEric W. Biederman atomic_t use_count; /* To track references we 185f256becSEric W. Biederman * destroy on demand 195f256becSEric W. Biederman */ 205f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 215f256becSEric W. Biederman struct work_struct work; /* work struct for freeing */ 22457c4cbcSEric W. Biederman 23457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 24457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 25457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_root; 26881d966bSEric W. Biederman 272774c7abSEric W. Biederman struct net_device *loopback_dev; /* The loopback */ 282774c7abSEric W. Biederman 29881d966bSEric W. Biederman struct list_head dev_base_head; 30881d966bSEric W. Biederman struct hlist_head *dev_name_head; 31881d966bSEric W. Biederman struct hlist_head *dev_index_head; 325f256becSEric W. Biederman }; 335f256becSEric W. Biederman 344fabcd71SDaniel Lezcano #ifdef CONFIG_NET 354fabcd71SDaniel Lezcano /* Init's network namespace */ 365f256becSEric W. Biederman extern struct net init_net; 374fabcd71SDaniel Lezcano #define INIT_NET_NS(net_ns) .net_ns = &init_net, 384fabcd71SDaniel Lezcano #else 394fabcd71SDaniel Lezcano #define INIT_NET_NS(net_ns) 404fabcd71SDaniel Lezcano #endif 414fabcd71SDaniel Lezcano 425f256becSEric W. Biederman extern struct list_head net_namespace_list; 435f256becSEric W. Biederman 449dd776b6SEric W. Biederman #ifdef CONFIG_NET 459dd776b6SEric W. Biederman extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 469dd776b6SEric W. Biederman #else 479dd776b6SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 489dd776b6SEric W. Biederman { 499dd776b6SEric W. Biederman /* There is nothing to copy so this is a noop */ 509dd776b6SEric W. Biederman return net_ns; 519dd776b6SEric W. Biederman } 529dd776b6SEric W. Biederman #endif 539dd776b6SEric W. Biederman 54d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 555f256becSEric W. Biederman extern void __put_net(struct net *net); 565f256becSEric W. Biederman 575f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 585f256becSEric W. Biederman { 595f256becSEric W. Biederman atomic_inc(&net->count); 605f256becSEric W. Biederman return net; 615f256becSEric W. Biederman } 625f256becSEric W. Biederman 63077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 64077130c0SEric W. Biederman { 65077130c0SEric W. Biederman /* Used when we know struct net exists but we 66077130c0SEric W. Biederman * aren't guaranteed a previous reference count 67077130c0SEric W. Biederman * exists. If the reference count is zero this 68077130c0SEric W. Biederman * function fails and returns NULL. 69077130c0SEric W. Biederman */ 70077130c0SEric W. Biederman if (!atomic_inc_not_zero(&net->count)) 71077130c0SEric W. Biederman net = NULL; 72077130c0SEric W. Biederman return net; 73077130c0SEric W. Biederman } 74077130c0SEric W. Biederman 755f256becSEric W. Biederman static inline void put_net(struct net *net) 765f256becSEric W. Biederman { 775f256becSEric W. Biederman if (atomic_dec_and_test(&net->count)) 785f256becSEric W. Biederman __put_net(net); 795f256becSEric W. Biederman } 805f256becSEric W. Biederman 815f256becSEric W. Biederman static inline struct net *hold_net(struct net *net) 825f256becSEric W. Biederman { 835f256becSEric W. Biederman atomic_inc(&net->use_count); 845f256becSEric W. Biederman return net; 855f256becSEric W. Biederman } 865f256becSEric W. Biederman 875f256becSEric W. Biederman static inline void release_net(struct net *net) 885f256becSEric W. Biederman { 895f256becSEric W. Biederman atomic_dec(&net->use_count); 905f256becSEric W. Biederman } 91d4655795SPavel Emelyanov #else 92d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 93d4655795SPavel Emelyanov { 94d4655795SPavel Emelyanov return net; 95d4655795SPavel Emelyanov } 96d4655795SPavel Emelyanov 97d4655795SPavel Emelyanov static inline void put_net(struct net *net) 98d4655795SPavel Emelyanov { 99d4655795SPavel Emelyanov } 100d4655795SPavel Emelyanov 101d4655795SPavel Emelyanov static inline struct net *hold_net(struct net *net) 102d4655795SPavel Emelyanov { 103d4655795SPavel Emelyanov return net; 104d4655795SPavel Emelyanov } 105d4655795SPavel Emelyanov 106d4655795SPavel Emelyanov static inline void release_net(struct net *net) 107d4655795SPavel Emelyanov { 108d4655795SPavel Emelyanov } 109d4655795SPavel Emelyanov 110d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 111d4655795SPavel Emelyanov { 112d4655795SPavel Emelyanov return net; 113d4655795SPavel Emelyanov } 114d4655795SPavel Emelyanov #endif 1155f256becSEric W. Biederman 1165f256becSEric W. Biederman #define for_each_net(VAR) \ 1175f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 1185f256becSEric W. Biederman 1194665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 1204665079cSPavel Emelyanov #define __net_init 1214665079cSPavel Emelyanov #define __net_exit 1224665079cSPavel Emelyanov #else 1234665079cSPavel Emelyanov #define __net_init __init 1244665079cSPavel Emelyanov #define __net_exit __exit_refok 1254665079cSPavel Emelyanov #endif 1265f256becSEric W. Biederman 1275f256becSEric W. Biederman struct pernet_operations { 1285f256becSEric W. Biederman struct list_head list; 1295f256becSEric W. Biederman int (*init)(struct net *net); 1305f256becSEric W. Biederman void (*exit)(struct net *net); 1315f256becSEric W. Biederman }; 1325f256becSEric W. Biederman 1335f256becSEric W. Biederman extern int register_pernet_subsys(struct pernet_operations *); 1345f256becSEric W. Biederman extern void unregister_pernet_subsys(struct pernet_operations *); 1355f256becSEric W. Biederman extern int register_pernet_device(struct pernet_operations *); 1365f256becSEric W. Biederman extern void unregister_pernet_device(struct pernet_operations *); 1375f256becSEric W. Biederman 1385f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 139