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 83dec827d1SPavel Emelyanov struct net_generic *gen; 845f256becSEric W. Biederman }; 855f256becSEric W. Biederman 86225c0a01SDenis V. Lunev 87c0f39322SDenis V. Lunev #include <linux/seq_file_net.h> 88c0f39322SDenis V. Lunev 894fabcd71SDaniel Lezcano /* Init's network namespace */ 905f256becSEric W. Biederman extern struct net init_net; 91a4aa834aSDenis V. Lunev 92a4aa834aSDenis V. Lunev #ifdef CONFIG_NET 934fabcd71SDaniel Lezcano #define INIT_NET_NS(net_ns) .net_ns = &init_net, 944fabcd71SDaniel Lezcano 959dd776b6SEric W. Biederman extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 96225c0a01SDenis V. Lunev 97225c0a01SDenis V. Lunev #else /* CONFIG_NET */ 98225c0a01SDenis V. Lunev 99225c0a01SDenis V. Lunev #define INIT_NET_NS(net_ns) 100225c0a01SDenis V. Lunev 1019dd776b6SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 1029dd776b6SEric W. Biederman { 1039dd776b6SEric W. Biederman /* There is nothing to copy so this is a noop */ 1049dd776b6SEric W. Biederman return net_ns; 1059dd776b6SEric W. Biederman } 106225c0a01SDenis V. Lunev #endif /* CONFIG_NET */ 107225c0a01SDenis V. Lunev 108225c0a01SDenis V. Lunev 109225c0a01SDenis V. Lunev extern struct list_head net_namespace_list; 1109dd776b6SEric W. Biederman 11130ffee84SJohannes Berg extern struct net *get_net_ns_by_pid(pid_t pid); 11230ffee84SJohannes Berg 113d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 1145f256becSEric W. Biederman extern void __put_net(struct net *net); 1155f256becSEric W. Biederman 1165f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 1175f256becSEric W. Biederman { 1185f256becSEric W. Biederman atomic_inc(&net->count); 1195f256becSEric W. Biederman return net; 1205f256becSEric W. Biederman } 1215f256becSEric W. Biederman 122077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 123077130c0SEric W. Biederman { 124077130c0SEric W. Biederman /* Used when we know struct net exists but we 125077130c0SEric W. Biederman * aren't guaranteed a previous reference count 126077130c0SEric W. Biederman * exists. If the reference count is zero this 127077130c0SEric W. Biederman * function fails and returns NULL. 128077130c0SEric W. Biederman */ 129077130c0SEric W. Biederman if (!atomic_inc_not_zero(&net->count)) 130077130c0SEric W. Biederman net = NULL; 131077130c0SEric W. Biederman return net; 132077130c0SEric W. Biederman } 133077130c0SEric W. Biederman 1345f256becSEric W. Biederman static inline void put_net(struct net *net) 1355f256becSEric W. Biederman { 1365f256becSEric W. Biederman if (atomic_dec_and_test(&net->count)) 1375f256becSEric W. Biederman __put_net(net); 1385f256becSEric W. Biederman } 1395f256becSEric W. Biederman 140878628fbSYOSHIFUJI Hideaki static inline 141878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 142878628fbSYOSHIFUJI Hideaki { 143878628fbSYOSHIFUJI Hideaki return net1 == net2; 144878628fbSYOSHIFUJI Hideaki } 145d4655795SPavel Emelyanov #else 146b9f75f45SEric W. Biederman 147d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 148d4655795SPavel Emelyanov { 149d4655795SPavel Emelyanov return net; 150d4655795SPavel Emelyanov } 151d4655795SPavel Emelyanov 152d4655795SPavel Emelyanov static inline void put_net(struct net *net) 153d4655795SPavel Emelyanov { 154d4655795SPavel Emelyanov } 155d4655795SPavel Emelyanov 156d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 157d4655795SPavel Emelyanov { 158d4655795SPavel Emelyanov return net; 159d4655795SPavel Emelyanov } 160878628fbSYOSHIFUJI Hideaki 161878628fbSYOSHIFUJI Hideaki static inline 162878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 163878628fbSYOSHIFUJI Hideaki { 164878628fbSYOSHIFUJI Hideaki return 1; 165878628fbSYOSHIFUJI Hideaki } 166d4655795SPavel Emelyanov #endif 1675f256becSEric W. Biederman 1685d1e4468SDenis V. Lunev 1695d1e4468SDenis V. Lunev #ifdef NETNS_REFCNT_DEBUG 1705d1e4468SDenis V. Lunev static inline struct net *hold_net(struct net *net) 1715d1e4468SDenis V. Lunev { 1725d1e4468SDenis V. Lunev if (net) 1735d1e4468SDenis V. Lunev atomic_inc(&net->use_count); 1745d1e4468SDenis V. Lunev return net; 1755d1e4468SDenis V. Lunev } 1765d1e4468SDenis V. Lunev 1775d1e4468SDenis V. Lunev static inline void release_net(struct net *net) 1785d1e4468SDenis V. Lunev { 1795d1e4468SDenis V. Lunev if (net) 1805d1e4468SDenis V. Lunev atomic_dec(&net->use_count); 1815d1e4468SDenis V. Lunev } 1825d1e4468SDenis V. Lunev #else 1835d1e4468SDenis V. Lunev static inline struct net *hold_net(struct net *net) 1845d1e4468SDenis V. Lunev { 1855d1e4468SDenis V. Lunev return net; 1865d1e4468SDenis V. Lunev } 1875d1e4468SDenis V. Lunev 1885d1e4468SDenis V. Lunev static inline void release_net(struct net *net) 1895d1e4468SDenis V. Lunev { 1905d1e4468SDenis V. Lunev } 1915d1e4468SDenis V. Lunev #endif 1925d1e4468SDenis V. Lunev 1938f424b5fSEric Dumazet #ifdef CONFIG_NET_NS 1948f424b5fSEric Dumazet 1958f424b5fSEric Dumazet static inline void write_pnet(struct net **pnet, struct net *net) 1968f424b5fSEric Dumazet { 1978f424b5fSEric Dumazet *pnet = net; 1988f424b5fSEric Dumazet } 1998f424b5fSEric Dumazet 2008f424b5fSEric Dumazet static inline struct net *read_pnet(struct net * const *pnet) 2018f424b5fSEric Dumazet { 2028f424b5fSEric Dumazet return *pnet; 2038f424b5fSEric Dumazet } 2048f424b5fSEric Dumazet 2058f424b5fSEric Dumazet #else 2068f424b5fSEric Dumazet 2078f424b5fSEric Dumazet #define write_pnet(pnet, net) do { (void)(net);} while (0) 2088f424b5fSEric Dumazet #define read_pnet(pnet) (&init_net) 2098f424b5fSEric Dumazet 2108f424b5fSEric Dumazet #endif 2115d1e4468SDenis V. Lunev 2125f256becSEric W. Biederman #define for_each_net(VAR) \ 2135f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 2145f256becSEric W. Biederman 21511a28d37SJohannes Berg #define for_each_net_rcu(VAR) \ 21611a28d37SJohannes Berg list_for_each_entry_rcu(VAR, &net_namespace_list, list) 21711a28d37SJohannes Berg 2184665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 2194665079cSPavel Emelyanov #define __net_init 2204665079cSPavel Emelyanov #define __net_exit 221022cbae6SDenis V. Lunev #define __net_initdata 2224665079cSPavel Emelyanov #else 2234665079cSPavel Emelyanov #define __net_init __init 2244665079cSPavel Emelyanov #define __net_exit __exit_refok 225022cbae6SDenis V. Lunev #define __net_initdata __initdata 2264665079cSPavel Emelyanov #endif 2275f256becSEric W. Biederman 2285f256becSEric W. Biederman struct pernet_operations { 2295f256becSEric W. Biederman struct list_head list; 2305f256becSEric W. Biederman int (*init)(struct net *net); 2315f256becSEric W. Biederman void (*exit)(struct net *net); 2325f256becSEric W. Biederman }; 2335f256becSEric W. Biederman 23417edde52SEric W. Biederman /* 23517edde52SEric W. Biederman * Use these carefully. If you implement a network device and it 23617edde52SEric W. Biederman * needs per network namespace operations use device pernet operations, 23717edde52SEric W. Biederman * otherwise use pernet subsys operations. 23817edde52SEric W. Biederman * 23917edde52SEric W. Biederman * This is critically important. Most of the network code cleanup 24017edde52SEric W. Biederman * runs with the assumption that dev_remove_pack has been called so no 24117edde52SEric W. Biederman * new packets will arrive during and after the cleanup functions have 24217edde52SEric W. Biederman * been called. dev_remove_pack is not per namespace so instead the 24317edde52SEric W. Biederman * guarantee of no more packets arriving in a network namespace is 24417edde52SEric W. Biederman * provided by ensuring that all network devices and all sockets have 24517edde52SEric W. Biederman * left the network namespace before the cleanup methods are called. 24617edde52SEric W. Biederman * 24717edde52SEric W. Biederman * For the longest time the ipv4 icmp code was registered as a pernet 24817edde52SEric W. Biederman * device which caused kernel oops, and panics during network 24917edde52SEric W. Biederman * namespace cleanup. So please don't get this wrong. 25017edde52SEric W. Biederman */ 2515f256becSEric W. Biederman extern int register_pernet_subsys(struct pernet_operations *); 2525f256becSEric W. Biederman extern void unregister_pernet_subsys(struct pernet_operations *); 253485ac57bSAlexey Dobriyan extern int register_pernet_gen_subsys(int *id, struct pernet_operations *); 254485ac57bSAlexey Dobriyan extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *); 2555f256becSEric W. Biederman extern int register_pernet_device(struct pernet_operations *); 2565f256becSEric W. Biederman extern void unregister_pernet_device(struct pernet_operations *); 257c93cf61fSPavel Emelyanov extern int register_pernet_gen_device(int *id, struct pernet_operations *); 258c93cf61fSPavel Emelyanov extern void unregister_pernet_gen_device(int id, struct pernet_operations *); 2595f256becSEric W. Biederman 26095bdfccbSEric W. Biederman struct ctl_path; 26195bdfccbSEric W. Biederman struct ctl_table; 26295bdfccbSEric W. Biederman struct ctl_table_header; 263d62c612eSPavel Emelyanov 26495bdfccbSEric W. Biederman extern struct ctl_table_header *register_net_sysctl_table(struct net *net, 26595bdfccbSEric W. Biederman const struct ctl_path *path, struct ctl_table *table); 266d62c612eSPavel Emelyanov extern struct ctl_table_header *register_net_sysctl_rotable( 267d62c612eSPavel Emelyanov const struct ctl_path *path, struct ctl_table *table); 26895bdfccbSEric W. Biederman extern void unregister_net_sysctl_table(struct ctl_table_header *header); 26995bdfccbSEric W. Biederman 2705f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 271