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 118efa6e93SPavel Emelyanov #include <net/netns/core.h> 12852566f5SPavel Emelyanov #include <net/netns/mib.h> 13a0a53c8bSDenis V. Lunev #include <net/netns/unix.h> 142aaef4e4SDenis V. Lunev #include <net/netns/packet.h> 158afd351cSPavel Emelyanov #include <net/netns/ipv4.h> 16b0f159dbSDaniel Lezcano #include <net/netns/ipv6.h> 1767019cc9SPavel Emelyanov #include <net/netns/dccp.h> 188d870052SAlexey Dobriyan #include <net/netns/x_tables.h> 19dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 20dfdb8d79SAlexey Dobriyan #include <net/netns/conntrack.h> 21dfdb8d79SAlexey Dobriyan #endif 22d62ddc21SAlexey Dobriyan #include <net/netns/xfrm.h> 23a0a53c8bSDenis V. Lunev 24457c4cbcSEric W. Biederman struct proc_dir_entry; 252774c7abSEric W. Biederman struct net_device; 2697c53cacSDenis V. Lunev struct sock; 271597fbc0SPavel Emelyanov struct ctl_table_header; 28dec827d1SPavel Emelyanov struct net_generic; 29134e6375SJohannes Berg struct sock; 301597fbc0SPavel Emelyanov 315f256becSEric W. Biederman struct net { 325f256becSEric W. Biederman atomic_t count; /* To decided when the network 335f256becSEric W. Biederman * namespace should be freed. 345f256becSEric W. Biederman */ 355d1e4468SDenis V. Lunev #ifdef NETNS_REFCNT_DEBUG 365f256becSEric W. Biederman atomic_t use_count; /* To track references we 375f256becSEric W. Biederman * destroy on demand 385f256becSEric W. Biederman */ 395d1e4468SDenis V. Lunev #endif 405f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 415f256becSEric W. Biederman struct work_struct work; /* work struct for freeing */ 42457c4cbcSEric W. Biederman 43457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 44457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 45881d966bSEric W. Biederman 4673455092SAl Viro #ifdef CONFIG_SYSCTL 4773455092SAl Viro struct ctl_table_set sysctls; 4873455092SAl Viro #endif 4995bdfccbSEric W. Biederman 502774c7abSEric W. Biederman struct net_device *loopback_dev; /* The loopback */ 512774c7abSEric W. Biederman 52881d966bSEric W. Biederman struct list_head dev_base_head; 53881d966bSEric W. Biederman struct hlist_head *dev_name_head; 54881d966bSEric W. Biederman struct hlist_head *dev_index_head; 5597c53cacSDenis V. Lunev 565fd30ee7SDenis V. Lunev /* core fib_rules */ 575fd30ee7SDenis V. Lunev struct list_head rules_ops; 585fd30ee7SDenis V. Lunev spinlock_t rules_mod_lock; 595fd30ee7SDenis V. Lunev 6097c53cacSDenis V. Lunev struct sock *rtnl; /* rtnetlink socket */ 61134e6375SJohannes Berg struct sock *genl_sock; 62d12d01d6SDenis V. Lunev 638efa6e93SPavel Emelyanov struct netns_core core; 64852566f5SPavel Emelyanov struct netns_mib mib; 652aaef4e4SDenis V. Lunev struct netns_packet packet; 66a0a53c8bSDenis V. Lunev struct netns_unix unx; 678afd351cSPavel Emelyanov struct netns_ipv4 ipv4; 68b0f159dbSDaniel Lezcano #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 69b0f159dbSDaniel Lezcano struct netns_ipv6 ipv6; 70b0f159dbSDaniel Lezcano #endif 7167019cc9SPavel Emelyanov #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 7267019cc9SPavel Emelyanov struct netns_dccp dccp; 7367019cc9SPavel Emelyanov #endif 748d870052SAlexey Dobriyan #ifdef CONFIG_NETFILTER 758d870052SAlexey Dobriyan struct netns_xt xt; 76dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 77dfdb8d79SAlexey Dobriyan struct netns_ct ct; 78dfdb8d79SAlexey Dobriyan #endif 798d870052SAlexey Dobriyan #endif 80d62ddc21SAlexey Dobriyan #ifdef CONFIG_XFRM 81d62ddc21SAlexey Dobriyan struct netns_xfrm xfrm; 82d62ddc21SAlexey Dobriyan #endif 833d23e349SJohannes Berg #ifdef CONFIG_WEXT_CORE 84b333b3d2SJohannes Berg struct sk_buff_head wext_nlevents; 85b333b3d2SJohannes Berg #endif 86dec827d1SPavel Emelyanov struct net_generic *gen; 875f256becSEric W. Biederman }; 885f256becSEric W. Biederman 89225c0a01SDenis V. Lunev 90c0f39322SDenis V. Lunev #include <linux/seq_file_net.h> 91c0f39322SDenis V. Lunev 924fabcd71SDaniel Lezcano /* Init's network namespace */ 935f256becSEric W. Biederman extern struct net init_net; 94a4aa834aSDenis V. Lunev 95a4aa834aSDenis V. Lunev #ifdef CONFIG_NET 964fabcd71SDaniel Lezcano #define INIT_NET_NS(net_ns) .net_ns = &init_net, 974fabcd71SDaniel Lezcano 989dd776b6SEric W. Biederman extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 99225c0a01SDenis V. Lunev 100225c0a01SDenis V. Lunev #else /* CONFIG_NET */ 101225c0a01SDenis V. Lunev 102225c0a01SDenis V. Lunev #define INIT_NET_NS(net_ns) 103225c0a01SDenis V. Lunev 1049dd776b6SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 1059dd776b6SEric W. Biederman { 1069dd776b6SEric W. Biederman /* There is nothing to copy so this is a noop */ 1079dd776b6SEric W. Biederman return net_ns; 1089dd776b6SEric W. Biederman } 109225c0a01SDenis V. Lunev #endif /* CONFIG_NET */ 110225c0a01SDenis V. Lunev 111225c0a01SDenis V. Lunev 112225c0a01SDenis V. Lunev extern struct list_head net_namespace_list; 1139dd776b6SEric W. Biederman 11430ffee84SJohannes Berg extern struct net *get_net_ns_by_pid(pid_t pid); 11530ffee84SJohannes Berg 116d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 1175f256becSEric W. Biederman extern void __put_net(struct net *net); 1185f256becSEric W. Biederman 1195f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 1205f256becSEric W. Biederman { 1215f256becSEric W. Biederman atomic_inc(&net->count); 1225f256becSEric W. Biederman return net; 1235f256becSEric W. Biederman } 1245f256becSEric W. Biederman 125077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 126077130c0SEric W. Biederman { 127077130c0SEric W. Biederman /* Used when we know struct net exists but we 128077130c0SEric W. Biederman * aren't guaranteed a previous reference count 129077130c0SEric W. Biederman * exists. If the reference count is zero this 130077130c0SEric W. Biederman * function fails and returns NULL. 131077130c0SEric W. Biederman */ 132077130c0SEric W. Biederman if (!atomic_inc_not_zero(&net->count)) 133077130c0SEric W. Biederman net = NULL; 134077130c0SEric W. Biederman return net; 135077130c0SEric W. Biederman } 136077130c0SEric W. Biederman 1375f256becSEric W. Biederman static inline void put_net(struct net *net) 1385f256becSEric W. Biederman { 1395f256becSEric W. Biederman if (atomic_dec_and_test(&net->count)) 1405f256becSEric W. Biederman __put_net(net); 1415f256becSEric W. Biederman } 1425f256becSEric W. Biederman 143878628fbSYOSHIFUJI Hideaki static inline 144878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 145878628fbSYOSHIFUJI Hideaki { 146878628fbSYOSHIFUJI Hideaki return net1 == net2; 147878628fbSYOSHIFUJI Hideaki } 148d4655795SPavel Emelyanov #else 149b9f75f45SEric W. Biederman 150d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 151d4655795SPavel Emelyanov { 152d4655795SPavel Emelyanov return net; 153d4655795SPavel Emelyanov } 154d4655795SPavel Emelyanov 155d4655795SPavel Emelyanov static inline void put_net(struct net *net) 156d4655795SPavel Emelyanov { 157d4655795SPavel Emelyanov } 158d4655795SPavel Emelyanov 159d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 160d4655795SPavel Emelyanov { 161d4655795SPavel Emelyanov return net; 162d4655795SPavel Emelyanov } 163878628fbSYOSHIFUJI Hideaki 164878628fbSYOSHIFUJI Hideaki static inline 165878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 166878628fbSYOSHIFUJI Hideaki { 167878628fbSYOSHIFUJI Hideaki return 1; 168878628fbSYOSHIFUJI Hideaki } 169d4655795SPavel Emelyanov #endif 1705f256becSEric W. Biederman 1715d1e4468SDenis V. Lunev 1725d1e4468SDenis V. Lunev #ifdef NETNS_REFCNT_DEBUG 1735d1e4468SDenis V. Lunev static inline struct net *hold_net(struct net *net) 1745d1e4468SDenis V. Lunev { 1755d1e4468SDenis V. Lunev if (net) 1765d1e4468SDenis V. Lunev atomic_inc(&net->use_count); 1775d1e4468SDenis V. Lunev return net; 1785d1e4468SDenis V. Lunev } 1795d1e4468SDenis V. Lunev 1805d1e4468SDenis V. Lunev static inline void release_net(struct net *net) 1815d1e4468SDenis V. Lunev { 1825d1e4468SDenis V. Lunev if (net) 1835d1e4468SDenis V. Lunev atomic_dec(&net->use_count); 1845d1e4468SDenis V. Lunev } 1855d1e4468SDenis V. Lunev #else 1865d1e4468SDenis V. Lunev static inline struct net *hold_net(struct net *net) 1875d1e4468SDenis V. Lunev { 1885d1e4468SDenis V. Lunev return net; 1895d1e4468SDenis V. Lunev } 1905d1e4468SDenis V. Lunev 1915d1e4468SDenis V. Lunev static inline void release_net(struct net *net) 1925d1e4468SDenis V. Lunev { 1935d1e4468SDenis V. Lunev } 1945d1e4468SDenis V. Lunev #endif 1955d1e4468SDenis V. Lunev 1968f424b5fSEric Dumazet #ifdef CONFIG_NET_NS 1978f424b5fSEric Dumazet 1988f424b5fSEric Dumazet static inline void write_pnet(struct net **pnet, struct net *net) 1998f424b5fSEric Dumazet { 2008f424b5fSEric Dumazet *pnet = net; 2018f424b5fSEric Dumazet } 2028f424b5fSEric Dumazet 2038f424b5fSEric Dumazet static inline struct net *read_pnet(struct net * const *pnet) 2048f424b5fSEric Dumazet { 2058f424b5fSEric Dumazet return *pnet; 2068f424b5fSEric Dumazet } 2078f424b5fSEric Dumazet 2088f424b5fSEric Dumazet #else 2098f424b5fSEric Dumazet 2108f424b5fSEric Dumazet #define write_pnet(pnet, net) do { (void)(net);} while (0) 2118f424b5fSEric Dumazet #define read_pnet(pnet) (&init_net) 2128f424b5fSEric Dumazet 2138f424b5fSEric Dumazet #endif 2145d1e4468SDenis V. Lunev 2155f256becSEric W. Biederman #define for_each_net(VAR) \ 2165f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 2175f256becSEric W. Biederman 21811a28d37SJohannes Berg #define for_each_net_rcu(VAR) \ 21911a28d37SJohannes Berg list_for_each_entry_rcu(VAR, &net_namespace_list, list) 22011a28d37SJohannes Berg 2214665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 2224665079cSPavel Emelyanov #define __net_init 2234665079cSPavel Emelyanov #define __net_exit 224022cbae6SDenis V. Lunev #define __net_initdata 2254665079cSPavel Emelyanov #else 2264665079cSPavel Emelyanov #define __net_init __init 2274665079cSPavel Emelyanov #define __net_exit __exit_refok 228022cbae6SDenis V. Lunev #define __net_initdata __initdata 2294665079cSPavel Emelyanov #endif 2305f256becSEric W. Biederman 2315f256becSEric W. Biederman struct pernet_operations { 2325f256becSEric W. Biederman struct list_head list; 2335f256becSEric W. Biederman int (*init)(struct net *net); 2345f256becSEric W. Biederman void (*exit)(struct net *net); 2355f256becSEric W. Biederman }; 2365f256becSEric W. Biederman 23717edde52SEric W. Biederman /* 23817edde52SEric W. Biederman * Use these carefully. If you implement a network device and it 23917edde52SEric W. Biederman * needs per network namespace operations use device pernet operations, 24017edde52SEric W. Biederman * otherwise use pernet subsys operations. 24117edde52SEric W. Biederman * 2424edf547bSJohannes Berg * Network interfaces need to be removed from a dying netns _before_ 2434edf547bSJohannes Berg * subsys notifiers can be called, as most of the network code cleanup 2444edf547bSJohannes Berg * (which is done from subsys notifiers) runs with the assumption that 2454edf547bSJohannes Berg * dev_remove_pack has been called so no new packets will arrive during 2464edf547bSJohannes Berg * and after the cleanup functions have been called. dev_remove_pack 2474edf547bSJohannes Berg * is not per namespace so instead the guarantee of no more packets 2484edf547bSJohannes Berg * arriving in a network namespace is provided by ensuring that all 2494edf547bSJohannes Berg * network devices and all sockets have left the network namespace 2504edf547bSJohannes Berg * before the cleanup methods are called. 25117edde52SEric W. Biederman * 25217edde52SEric W. Biederman * For the longest time the ipv4 icmp code was registered as a pernet 25317edde52SEric W. Biederman * device which caused kernel oops, and panics during network 25417edde52SEric W. Biederman * namespace cleanup. So please don't get this wrong. 25517edde52SEric W. Biederman */ 2565f256becSEric W. Biederman extern int register_pernet_subsys(struct pernet_operations *); 2575f256becSEric W. Biederman extern void unregister_pernet_subsys(struct pernet_operations *); 258485ac57bSAlexey Dobriyan extern int register_pernet_gen_subsys(int *id, struct pernet_operations *); 259485ac57bSAlexey Dobriyan extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *); 2605f256becSEric W. Biederman extern int register_pernet_device(struct pernet_operations *); 2615f256becSEric W. Biederman extern void unregister_pernet_device(struct pernet_operations *); 262c93cf61fSPavel Emelyanov extern int register_pernet_gen_device(int *id, struct pernet_operations *); 263c93cf61fSPavel Emelyanov extern void unregister_pernet_gen_device(int id, struct pernet_operations *); 2645f256becSEric W. Biederman 26595bdfccbSEric W. Biederman struct ctl_path; 26695bdfccbSEric W. Biederman struct ctl_table; 26795bdfccbSEric W. Biederman struct ctl_table_header; 268d62c612eSPavel Emelyanov 26995bdfccbSEric W. Biederman extern struct ctl_table_header *register_net_sysctl_table(struct net *net, 27095bdfccbSEric W. Biederman const struct ctl_path *path, struct ctl_table *table); 271d62c612eSPavel Emelyanov extern struct ctl_table_header *register_net_sysctl_rotable( 272d62c612eSPavel Emelyanov const struct ctl_path *path, struct ctl_table *table); 27395bdfccbSEric W. Biederman extern void unregister_net_sysctl_table(struct ctl_table_header *header); 27495bdfccbSEric W. Biederman 2755f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 276