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; 1397c53cacSDenis V. Lunev struct sock; 141597fbc0SPavel Emelyanov struct ctl_table_header; 151597fbc0SPavel Emelyanov 165f256becSEric W. Biederman struct net { 175f256becSEric W. Biederman atomic_t count; /* To decided when the network 185f256becSEric W. Biederman * namespace should be freed. 195f256becSEric W. Biederman */ 205f256becSEric W. Biederman atomic_t use_count; /* To track references we 215f256becSEric W. Biederman * destroy on demand 225f256becSEric W. Biederman */ 235f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 245f256becSEric W. Biederman struct work_struct work; /* work struct for freeing */ 25457c4cbcSEric W. Biederman 26457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 27457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 28457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_root; 29881d966bSEric W. Biederman 3095bdfccbSEric W. Biederman struct list_head sysctl_table_headers; 3195bdfccbSEric W. Biederman 322774c7abSEric W. Biederman struct net_device *loopback_dev; /* The loopback */ 332774c7abSEric W. Biederman 34881d966bSEric W. Biederman struct list_head dev_base_head; 35881d966bSEric W. Biederman struct hlist_head *dev_name_head; 36881d966bSEric W. Biederman struct hlist_head *dev_index_head; 3797c53cacSDenis V. Lunev 3897c53cacSDenis V. Lunev struct sock *rtnl; /* rtnetlink socket */ 39d12d01d6SDenis V. Lunev 40d12d01d6SDenis V. Lunev /* List of all packet sockets. */ 41d12d01d6SDenis V. Lunev rwlock_t packet_sklist_lock; 42d12d01d6SDenis V. Lunev struct hlist_head packet_sklist; 43d392e497SPavel Emelyanov 44d392e497SPavel Emelyanov /* unix sockets */ 45d392e497SPavel Emelyanov int sysctl_unix_max_dgram_qlen; 461597fbc0SPavel Emelyanov struct ctl_table_header *unix_ctl; 475f256becSEric W. Biederman }; 485f256becSEric W. Biederman 494fabcd71SDaniel Lezcano #ifdef CONFIG_NET 504fabcd71SDaniel Lezcano /* Init's network namespace */ 515f256becSEric W. Biederman extern struct net init_net; 524fabcd71SDaniel Lezcano #define INIT_NET_NS(net_ns) .net_ns = &init_net, 534fabcd71SDaniel Lezcano #else 544fabcd71SDaniel Lezcano #define INIT_NET_NS(net_ns) 554fabcd71SDaniel Lezcano #endif 564fabcd71SDaniel Lezcano 575f256becSEric W. Biederman extern struct list_head net_namespace_list; 585f256becSEric W. Biederman 599dd776b6SEric W. Biederman #ifdef CONFIG_NET 609dd776b6SEric W. Biederman extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 619dd776b6SEric W. Biederman #else 629dd776b6SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 639dd776b6SEric W. Biederman { 649dd776b6SEric W. Biederman /* There is nothing to copy so this is a noop */ 659dd776b6SEric W. Biederman return net_ns; 669dd776b6SEric W. Biederman } 679dd776b6SEric W. Biederman #endif 689dd776b6SEric W. Biederman 69d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 705f256becSEric W. Biederman extern void __put_net(struct net *net); 715f256becSEric W. Biederman 725f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 735f256becSEric W. Biederman { 745f256becSEric W. Biederman atomic_inc(&net->count); 755f256becSEric W. Biederman return net; 765f256becSEric W. Biederman } 775f256becSEric W. Biederman 78077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 79077130c0SEric W. Biederman { 80077130c0SEric W. Biederman /* Used when we know struct net exists but we 81077130c0SEric W. Biederman * aren't guaranteed a previous reference count 82077130c0SEric W. Biederman * exists. If the reference count is zero this 83077130c0SEric W. Biederman * function fails and returns NULL. 84077130c0SEric W. Biederman */ 85077130c0SEric W. Biederman if (!atomic_inc_not_zero(&net->count)) 86077130c0SEric W. Biederman net = NULL; 87077130c0SEric W. Biederman return net; 88077130c0SEric W. Biederman } 89077130c0SEric W. Biederman 905f256becSEric W. Biederman static inline void put_net(struct net *net) 915f256becSEric W. Biederman { 925f256becSEric W. Biederman if (atomic_dec_and_test(&net->count)) 935f256becSEric W. Biederman __put_net(net); 945f256becSEric W. Biederman } 955f256becSEric W. Biederman 965f256becSEric W. Biederman static inline struct net *hold_net(struct net *net) 975f256becSEric W. Biederman { 985f256becSEric W. Biederman atomic_inc(&net->use_count); 995f256becSEric W. Biederman return net; 1005f256becSEric W. Biederman } 1015f256becSEric W. Biederman 1025f256becSEric W. Biederman static inline void release_net(struct net *net) 1035f256becSEric W. Biederman { 1045f256becSEric W. Biederman atomic_dec(&net->use_count); 1055f256becSEric W. Biederman } 106d4655795SPavel Emelyanov #else 107d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 108d4655795SPavel Emelyanov { 109d4655795SPavel Emelyanov return net; 110d4655795SPavel Emelyanov } 111d4655795SPavel Emelyanov 112d4655795SPavel Emelyanov static inline void put_net(struct net *net) 113d4655795SPavel Emelyanov { 114d4655795SPavel Emelyanov } 115d4655795SPavel Emelyanov 116d4655795SPavel Emelyanov static inline struct net *hold_net(struct net *net) 117d4655795SPavel Emelyanov { 118d4655795SPavel Emelyanov return net; 119d4655795SPavel Emelyanov } 120d4655795SPavel Emelyanov 121d4655795SPavel Emelyanov static inline void release_net(struct net *net) 122d4655795SPavel Emelyanov { 123d4655795SPavel Emelyanov } 124d4655795SPavel Emelyanov 125d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 126d4655795SPavel Emelyanov { 127d4655795SPavel Emelyanov return net; 128d4655795SPavel Emelyanov } 129d4655795SPavel Emelyanov #endif 1305f256becSEric W. Biederman 1315f256becSEric W. Biederman #define for_each_net(VAR) \ 1325f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 1335f256becSEric W. Biederman 1344665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 1354665079cSPavel Emelyanov #define __net_init 1364665079cSPavel Emelyanov #define __net_exit 137022cbae6SDenis V. Lunev #define __net_initdata 1384665079cSPavel Emelyanov #else 1394665079cSPavel Emelyanov #define __net_init __init 1404665079cSPavel Emelyanov #define __net_exit __exit_refok 141022cbae6SDenis V. Lunev #define __net_initdata __initdata 1424665079cSPavel Emelyanov #endif 1435f256becSEric W. Biederman 1445f256becSEric W. Biederman struct pernet_operations { 1455f256becSEric W. Biederman struct list_head list; 1465f256becSEric W. Biederman int (*init)(struct net *net); 1475f256becSEric W. Biederman void (*exit)(struct net *net); 1485f256becSEric W. Biederman }; 1495f256becSEric W. Biederman 1505f256becSEric W. Biederman extern int register_pernet_subsys(struct pernet_operations *); 1515f256becSEric W. Biederman extern void unregister_pernet_subsys(struct pernet_operations *); 1525f256becSEric W. Biederman extern int register_pernet_device(struct pernet_operations *); 1535f256becSEric W. Biederman extern void unregister_pernet_device(struct pernet_operations *); 1545f256becSEric W. Biederman 15595bdfccbSEric W. Biederman struct ctl_path; 15695bdfccbSEric W. Biederman struct ctl_table; 15795bdfccbSEric W. Biederman struct ctl_table_header; 15895bdfccbSEric W. Biederman extern struct ctl_table_header *register_net_sysctl_table(struct net *net, 15995bdfccbSEric W. Biederman const struct ctl_path *path, struct ctl_table *table); 16095bdfccbSEric W. Biederman extern void unregister_net_sysctl_table(struct ctl_table_header *header); 16195bdfccbSEric W. Biederman 1625f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 163