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 760063497SArun Sharma #include <linux/atomic.h> 85f256becSEric W. Biederman #include <linux/workqueue.h> 95f256becSEric W. Biederman #include <linux/list.h> 10bee95250SDavid S. Miller #include <linux/sysctl.h> 115f256becSEric W. Biederman 128efa6e93SPavel Emelyanov #include <net/netns/core.h> 13852566f5SPavel Emelyanov #include <net/netns/mib.h> 14a0a53c8bSDenis V. Lunev #include <net/netns/unix.h> 152aaef4e4SDenis V. Lunev #include <net/netns/packet.h> 168afd351cSPavel Emelyanov #include <net/netns/ipv4.h> 17b0f159dbSDaniel Lezcano #include <net/netns/ipv6.h> 184db67e80SEric W. Biederman #include <net/netns/sctp.h> 1967019cc9SPavel Emelyanov #include <net/netns/dccp.h> 208d870052SAlexey Dobriyan #include <net/netns/x_tables.h> 21dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 22dfdb8d79SAlexey Dobriyan #include <net/netns/conntrack.h> 23dfdb8d79SAlexey Dobriyan #endif 24d62ddc21SAlexey Dobriyan #include <net/netns/xfrm.h> 25a0a53c8bSDenis V. Lunev 26038e7332SEric W. Biederman struct user_namespace; 27457c4cbcSEric W. Biederman struct proc_dir_entry; 282774c7abSEric W. Biederman struct net_device; 2997c53cacSDenis V. Lunev struct sock; 301597fbc0SPavel Emelyanov struct ctl_table_header; 31dec827d1SPavel Emelyanov struct net_generic; 32134e6375SJohannes Berg struct sock; 332553d064SJulian Anastasov struct netns_ipvs; 341597fbc0SPavel Emelyanov 357c28bd0bSEric Dumazet 367c28bd0bSEric Dumazet #define NETDEV_HASHBITS 8 377c28bd0bSEric Dumazet #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 387c28bd0bSEric Dumazet 395f256becSEric W. Biederman struct net { 40a685e089SAl Viro atomic_t passive; /* To decided when the network 415f256becSEric W. Biederman * namespace should be freed. 425f256becSEric W. Biederman */ 43a685e089SAl Viro atomic_t count; /* To decided when the network 44a685e089SAl Viro * namespace should be shut down. 45a685e089SAl Viro */ 465d1e4468SDenis V. Lunev #ifdef NETNS_REFCNT_DEBUG 475f256becSEric W. Biederman atomic_t use_count; /* To track references we 485f256becSEric W. Biederman * destroy on demand 495f256becSEric W. Biederman */ 505d1e4468SDenis V. Lunev #endif 518e602ce2SEric Dumazet spinlock_t rules_mod_lock; 528e602ce2SEric Dumazet 535f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 542b035b39SEric W. Biederman struct list_head cleanup_list; /* namespaces on death row */ 5572ad937aSEric W. Biederman struct list_head exit_list; /* Use only net_mutex */ 56457c4cbcSEric W. Biederman 57038e7332SEric W. Biederman struct user_namespace *user_ns; /* Owning user namespace */ 58038e7332SEric W. Biederman 5998f842e6SEric W. Biederman unsigned int proc_inum; 6098f842e6SEric W. Biederman 61457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 62457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 63881d966bSEric W. Biederman 6473455092SAl Viro #ifdef CONFIG_SYSCTL 6573455092SAl Viro struct ctl_table_set sysctls; 6673455092SAl Viro #endif 6795bdfccbSEric W. Biederman 688e602ce2SEric Dumazet struct sock *rtnl; /* rtnetlink socket */ 698e602ce2SEric Dumazet struct sock *genl_sock; 702774c7abSEric W. Biederman 71881d966bSEric W. Biederman struct list_head dev_base_head; 72881d966bSEric W. Biederman struct hlist_head *dev_name_head; 73881d966bSEric W. Biederman struct hlist_head *dev_index_head; 744e985adaSThomas Graf unsigned int dev_base_seq; /* protected by rtnl_mutex */ 75aa79e66eSPavel Emelyanov int ifindex; 7697c53cacSDenis V. Lunev 775fd30ee7SDenis V. Lunev /* core fib_rules */ 785fd30ee7SDenis V. Lunev struct list_head rules_ops; 795fd30ee7SDenis V. Lunev 80d12d01d6SDenis V. Lunev 818e602ce2SEric Dumazet struct net_device *loopback_dev; /* The loopback */ 828efa6e93SPavel Emelyanov struct netns_core core; 83852566f5SPavel Emelyanov struct netns_mib mib; 842aaef4e4SDenis V. Lunev struct netns_packet packet; 85a0a53c8bSDenis V. Lunev struct netns_unix unx; 868afd351cSPavel Emelyanov struct netns_ipv4 ipv4; 87dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 88b0f159dbSDaniel Lezcano struct netns_ipv6 ipv6; 89b0f159dbSDaniel Lezcano #endif 904db67e80SEric W. Biederman #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 914db67e80SEric W. Biederman struct netns_sctp sctp; 924db67e80SEric W. Biederman #endif 9367019cc9SPavel Emelyanov #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 9467019cc9SPavel Emelyanov struct netns_dccp dccp; 9567019cc9SPavel Emelyanov #endif 968d870052SAlexey Dobriyan #ifdef CONFIG_NETFILTER 978d870052SAlexey Dobriyan struct netns_xt xt; 98dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 99dfdb8d79SAlexey Dobriyan struct netns_ct ct; 100dfdb8d79SAlexey Dobriyan #endif 101c038a767SAmerigo Wang #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 102c038a767SAmerigo Wang struct netns_nf_frag nf_frag; 103c038a767SAmerigo Wang #endif 104cd8c20b6SAlexey Dobriyan struct sock *nfnl; 105cd8c20b6SAlexey Dobriyan struct sock *nfnl_stash; 1068d870052SAlexey Dobriyan #endif 1073d23e349SJohannes Berg #ifdef CONFIG_WEXT_CORE 108b333b3d2SJohannes Berg struct sk_buff_head wext_nlevents; 109b333b3d2SJohannes Berg #endif 1101c87733dSEric Dumazet struct net_generic __rcu *gen; 1118e602ce2SEric Dumazet 1128e602ce2SEric Dumazet /* Note : following structs are cache line aligned */ 1138e602ce2SEric Dumazet #ifdef CONFIG_XFRM 1148e602ce2SEric Dumazet struct netns_xfrm xfrm; 1158e602ce2SEric Dumazet #endif 11661b1ab45SHans Schillstrom struct netns_ipvs *ipvs; 11751d7cccfSAndrey Vagin struct sock *diag_nlsk; 118b42664f8SNicolas Dichtel atomic_t rt_genid; 1195f256becSEric W. Biederman }; 1205f256becSEric W. Biederman 1211fb9489bSPavel Emelyanov /* 1221fb9489bSPavel Emelyanov * ifindex generation is per-net namespace, and loopback is 1231fb9489bSPavel Emelyanov * always the 1st device in ns (see net_dev_init), thus any 1241fb9489bSPavel Emelyanov * loopback device should get ifindex 1 1251fb9489bSPavel Emelyanov */ 1261fb9489bSPavel Emelyanov 1271fb9489bSPavel Emelyanov #define LOOPBACK_IFINDEX 1 128225c0a01SDenis V. Lunev 129c0f39322SDenis V. Lunev #include <linux/seq_file_net.h> 130c0f39322SDenis V. Lunev 1314fabcd71SDaniel Lezcano /* Init's network namespace */ 1325f256becSEric W. Biederman extern struct net init_net; 133a4aa834aSDenis V. Lunev 134d727abcbSEric W. Biederman #ifdef CONFIG_NET_NS 135038e7332SEric W. Biederman extern struct net *copy_net_ns(unsigned long flags, 136038e7332SEric W. Biederman struct user_namespace *user_ns, struct net *old_net); 137225c0a01SDenis V. Lunev 138d727abcbSEric W. Biederman #else /* CONFIG_NET_NS */ 139d727abcbSEric W. Biederman #include <linux/sched.h> 140d727abcbSEric W. Biederman #include <linux/nsproxy.h> 141038e7332SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, 142038e7332SEric W. Biederman struct user_namespace *user_ns, struct net *old_net) 1439dd776b6SEric W. Biederman { 144d727abcbSEric W. Biederman if (flags & CLONE_NEWNET) 145d727abcbSEric W. Biederman return ERR_PTR(-EINVAL); 146d727abcbSEric W. Biederman return old_net; 1479dd776b6SEric W. Biederman } 148d727abcbSEric W. Biederman #endif /* CONFIG_NET_NS */ 149225c0a01SDenis V. Lunev 150225c0a01SDenis V. Lunev 151225c0a01SDenis V. Lunev extern struct list_head net_namespace_list; 1529dd776b6SEric W. Biederman 15330ffee84SJohannes Berg extern struct net *get_net_ns_by_pid(pid_t pid); 154f0630529SEric W. Biederman extern struct net *get_net_ns_by_fd(int pid); 15530ffee84SJohannes Berg 156d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 1575f256becSEric W. Biederman extern void __put_net(struct net *net); 1585f256becSEric W. Biederman 1595f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 1605f256becSEric W. Biederman { 1615f256becSEric W. Biederman atomic_inc(&net->count); 1625f256becSEric W. Biederman return net; 1635f256becSEric W. Biederman } 1645f256becSEric W. Biederman 165077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 166077130c0SEric W. Biederman { 167077130c0SEric W. Biederman /* Used when we know struct net exists but we 168077130c0SEric W. Biederman * aren't guaranteed a previous reference count 169077130c0SEric W. Biederman * exists. If the reference count is zero this 170077130c0SEric W. Biederman * function fails and returns NULL. 171077130c0SEric W. Biederman */ 172077130c0SEric W. Biederman if (!atomic_inc_not_zero(&net->count)) 173077130c0SEric W. Biederman net = NULL; 174077130c0SEric W. Biederman return net; 175077130c0SEric W. Biederman } 176077130c0SEric W. Biederman 1775f256becSEric W. Biederman static inline void put_net(struct net *net) 1785f256becSEric W. Biederman { 1795f256becSEric W. Biederman if (atomic_dec_and_test(&net->count)) 1805f256becSEric W. Biederman __put_net(net); 1815f256becSEric W. Biederman } 1825f256becSEric W. Biederman 183878628fbSYOSHIFUJI Hideaki static inline 184878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 185878628fbSYOSHIFUJI Hideaki { 186878628fbSYOSHIFUJI Hideaki return net1 == net2; 187878628fbSYOSHIFUJI Hideaki } 188a685e089SAl Viro 189a685e089SAl Viro extern void net_drop_ns(void *); 190a685e089SAl Viro 191d4655795SPavel Emelyanov #else 192b9f75f45SEric W. Biederman 193d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 194d4655795SPavel Emelyanov { 195d4655795SPavel Emelyanov return net; 196d4655795SPavel Emelyanov } 197d4655795SPavel Emelyanov 198d4655795SPavel Emelyanov static inline void put_net(struct net *net) 199d4655795SPavel Emelyanov { 200d4655795SPavel Emelyanov } 201d4655795SPavel Emelyanov 202d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 203d4655795SPavel Emelyanov { 204d4655795SPavel Emelyanov return net; 205d4655795SPavel Emelyanov } 206878628fbSYOSHIFUJI Hideaki 207878628fbSYOSHIFUJI Hideaki static inline 208878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 209878628fbSYOSHIFUJI Hideaki { 210878628fbSYOSHIFUJI Hideaki return 1; 211878628fbSYOSHIFUJI Hideaki } 212a685e089SAl Viro 213a685e089SAl Viro #define net_drop_ns NULL 214d4655795SPavel Emelyanov #endif 2155f256becSEric W. Biederman 2165d1e4468SDenis V. Lunev 2175d1e4468SDenis V. Lunev #ifdef NETNS_REFCNT_DEBUG 2185d1e4468SDenis V. Lunev static inline struct net *hold_net(struct net *net) 2195d1e4468SDenis V. Lunev { 2205d1e4468SDenis V. Lunev if (net) 2215d1e4468SDenis V. Lunev atomic_inc(&net->use_count); 2225d1e4468SDenis V. Lunev return net; 2235d1e4468SDenis V. Lunev } 2245d1e4468SDenis V. Lunev 2255d1e4468SDenis V. Lunev static inline void release_net(struct net *net) 2265d1e4468SDenis V. Lunev { 2275d1e4468SDenis V. Lunev if (net) 2285d1e4468SDenis V. Lunev atomic_dec(&net->use_count); 2295d1e4468SDenis V. Lunev } 2305d1e4468SDenis V. Lunev #else 2315d1e4468SDenis V. Lunev static inline struct net *hold_net(struct net *net) 2325d1e4468SDenis V. Lunev { 2335d1e4468SDenis V. Lunev return net; 2345d1e4468SDenis V. Lunev } 2355d1e4468SDenis V. Lunev 2365d1e4468SDenis V. Lunev static inline void release_net(struct net *net) 2375d1e4468SDenis V. Lunev { 2385d1e4468SDenis V. Lunev } 2395d1e4468SDenis V. Lunev #endif 2405d1e4468SDenis V. Lunev 2418f424b5fSEric Dumazet #ifdef CONFIG_NET_NS 2428f424b5fSEric Dumazet 2438f424b5fSEric Dumazet static inline void write_pnet(struct net **pnet, struct net *net) 2448f424b5fSEric Dumazet { 2458f424b5fSEric Dumazet *pnet = net; 2468f424b5fSEric Dumazet } 2478f424b5fSEric Dumazet 2488f424b5fSEric Dumazet static inline struct net *read_pnet(struct net * const *pnet) 2498f424b5fSEric Dumazet { 2508f424b5fSEric Dumazet return *pnet; 2518f424b5fSEric Dumazet } 2528f424b5fSEric Dumazet 2538f424b5fSEric Dumazet #else 2548f424b5fSEric Dumazet 2558f424b5fSEric Dumazet #define write_pnet(pnet, net) do { (void)(net);} while (0) 2568f424b5fSEric Dumazet #define read_pnet(pnet) (&init_net) 2578f424b5fSEric Dumazet 2588f424b5fSEric Dumazet #endif 2595d1e4468SDenis V. Lunev 2605f256becSEric W. Biederman #define for_each_net(VAR) \ 2615f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 2625f256becSEric W. Biederman 26311a28d37SJohannes Berg #define for_each_net_rcu(VAR) \ 26411a28d37SJohannes Berg list_for_each_entry_rcu(VAR, &net_namespace_list, list) 26511a28d37SJohannes Berg 2664665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 2674665079cSPavel Emelyanov #define __net_init 2684665079cSPavel Emelyanov #define __net_exit 269022cbae6SDenis V. Lunev #define __net_initdata 27004a6f82cSAndi Kleen #define __net_initconst 2714665079cSPavel Emelyanov #else 2724665079cSPavel Emelyanov #define __net_init __init 2734665079cSPavel Emelyanov #define __net_exit __exit_refok 274022cbae6SDenis V. Lunev #define __net_initdata __initdata 27504a6f82cSAndi Kleen #define __net_initconst __initconst 2764665079cSPavel Emelyanov #endif 2775f256becSEric W. Biederman 2785f256becSEric W. Biederman struct pernet_operations { 2795f256becSEric W. Biederman struct list_head list; 2805f256becSEric W. Biederman int (*init)(struct net *net); 2815f256becSEric W. Biederman void (*exit)(struct net *net); 28272ad937aSEric W. Biederman void (*exit_batch)(struct list_head *net_exit_list); 283f875bae0SEric W. Biederman int *id; 284f875bae0SEric W. Biederman size_t size; 2855f256becSEric W. Biederman }; 2865f256becSEric W. Biederman 28717edde52SEric W. Biederman /* 28817edde52SEric W. Biederman * Use these carefully. If you implement a network device and it 28917edde52SEric W. Biederman * needs per network namespace operations use device pernet operations, 29017edde52SEric W. Biederman * otherwise use pernet subsys operations. 29117edde52SEric W. Biederman * 2924edf547bSJohannes Berg * Network interfaces need to be removed from a dying netns _before_ 2934edf547bSJohannes Berg * subsys notifiers can be called, as most of the network code cleanup 2944edf547bSJohannes Berg * (which is done from subsys notifiers) runs with the assumption that 2954edf547bSJohannes Berg * dev_remove_pack has been called so no new packets will arrive during 2964edf547bSJohannes Berg * and after the cleanup functions have been called. dev_remove_pack 2974edf547bSJohannes Berg * is not per namespace so instead the guarantee of no more packets 2984edf547bSJohannes Berg * arriving in a network namespace is provided by ensuring that all 2994edf547bSJohannes Berg * network devices and all sockets have left the network namespace 3004edf547bSJohannes Berg * before the cleanup methods are called. 30117edde52SEric W. Biederman * 30217edde52SEric W. Biederman * For the longest time the ipv4 icmp code was registered as a pernet 30317edde52SEric W. Biederman * device which caused kernel oops, and panics during network 30417edde52SEric W. Biederman * namespace cleanup. So please don't get this wrong. 30517edde52SEric W. Biederman */ 3065f256becSEric W. Biederman extern int register_pernet_subsys(struct pernet_operations *); 3075f256becSEric W. Biederman extern void unregister_pernet_subsys(struct pernet_operations *); 3085f256becSEric W. Biederman extern int register_pernet_device(struct pernet_operations *); 3095f256becSEric W. Biederman extern void unregister_pernet_device(struct pernet_operations *); 310f875bae0SEric W. Biederman 31195bdfccbSEric W. Biederman struct ctl_table; 31295bdfccbSEric W. Biederman struct ctl_table_header; 313d62c612eSPavel Emelyanov 3142ca794e5SEric W. Biederman #ifdef CONFIG_SYSCTL 3152ca794e5SEric W. Biederman extern int net_sysctl_init(void); 316ab41a2caSEric W. Biederman extern struct ctl_table_header *register_net_sysctl(struct net *net, 317ab41a2caSEric W. Biederman const char *path, struct ctl_table *table); 31895bdfccbSEric W. Biederman extern void unregister_net_sysctl_table(struct ctl_table_header *header); 31948c74958SEric W. Biederman #else 32048c74958SEric W. Biederman static inline int net_sysctl_init(void) { return 0; } 32148c74958SEric W. Biederman static inline struct ctl_table_header *register_net_sysctl(struct net *net, 32248c74958SEric W. Biederman const char *path, struct ctl_table *table) 32348c74958SEric W. Biederman { 32448c74958SEric W. Biederman return NULL; 32548c74958SEric W. Biederman } 32648c74958SEric W. Biederman static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 32748c74958SEric W. Biederman { 32848c74958SEric W. Biederman } 32948c74958SEric W. Biederman #endif 33048c74958SEric W. Biederman 331b42664f8SNicolas Dichtel static inline int rt_genid(struct net *net) 332b42664f8SNicolas Dichtel { 333b42664f8SNicolas Dichtel return atomic_read(&net->rt_genid); 334b42664f8SNicolas Dichtel } 335b42664f8SNicolas Dichtel 336b42664f8SNicolas Dichtel static inline void rt_genid_bump(struct net *net) 337b42664f8SNicolas Dichtel { 338b42664f8SNicolas Dichtel atomic_inc(&net->rt_genid); 339b42664f8SNicolas Dichtel } 34095bdfccbSEric W. Biederman 3415f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 342