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 126a662719SCong Wang #include <net/flow.h> 138efa6e93SPavel Emelyanov #include <net/netns/core.h> 14852566f5SPavel Emelyanov #include <net/netns/mib.h> 15a0a53c8bSDenis V. Lunev #include <net/netns/unix.h> 162aaef4e4SDenis V. Lunev #include <net/netns/packet.h> 178afd351cSPavel Emelyanov #include <net/netns/ipv4.h> 18b0f159dbSDaniel Lezcano #include <net/netns/ipv6.h> 19633fc86fSAlexander Aring #include <net/netns/ieee802154_6lowpan.h> 204db67e80SEric W. Biederman #include <net/netns/sctp.h> 2167019cc9SPavel Emelyanov #include <net/netns/dccp.h> 22f3c1a44aSGao feng #include <net/netns/netfilter.h> 238d870052SAlexey Dobriyan #include <net/netns/x_tables.h> 24dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 25dfdb8d79SAlexey Dobriyan #include <net/netns/conntrack.h> 26dfdb8d79SAlexey Dobriyan #endif 2799633ab2SPablo Neira Ayuso #include <net/netns/nftables.h> 28d62ddc21SAlexey Dobriyan #include <net/netns/xfrm.h> 290189197fSEric W. Biederman #include <net/netns/mpls.h> 30435d5f4bSAl Viro #include <linux/ns_common.h> 31a0a53c8bSDenis V. Lunev 32038e7332SEric W. Biederman struct user_namespace; 33457c4cbcSEric W. Biederman struct proc_dir_entry; 342774c7abSEric W. Biederman struct net_device; 3597c53cacSDenis V. Lunev struct sock; 361597fbc0SPavel Emelyanov struct ctl_table_header; 37dec827d1SPavel Emelyanov struct net_generic; 38134e6375SJohannes Berg struct sock; 392553d064SJulian Anastasov struct netns_ipvs; 401597fbc0SPavel Emelyanov 417c28bd0bSEric Dumazet 427c28bd0bSEric Dumazet #define NETDEV_HASHBITS 8 437c28bd0bSEric Dumazet #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 447c28bd0bSEric Dumazet 455f256becSEric W. Biederman struct net { 46a685e089SAl Viro atomic_t passive; /* To decided when the network 475f256becSEric W. Biederman * namespace should be freed. 485f256becSEric W. Biederman */ 49a685e089SAl Viro atomic_t count; /* To decided when the network 50a685e089SAl Viro * namespace should be shut down. 51a685e089SAl Viro */ 528e602ce2SEric Dumazet spinlock_t rules_mod_lock; 538e602ce2SEric Dumazet 5433cf7c90SEric Dumazet atomic64_t cookie_gen; 5533cf7c90SEric Dumazet 565f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 572b035b39SEric W. Biederman struct list_head cleanup_list; /* namespaces on death row */ 5872ad937aSEric W. Biederman struct list_head exit_list; /* Use only net_mutex */ 59457c4cbcSEric W. Biederman 60038e7332SEric W. Biederman struct user_namespace *user_ns; /* Owning user namespace */ 61de133464SWANG Cong spinlock_t nsid_lock; 620c7aecd4SNicolas Dichtel struct idr netns_ids; 63038e7332SEric W. Biederman 64435d5f4bSAl Viro struct ns_common ns; 6598f842e6SEric W. Biederman 66457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 67457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 68881d966bSEric W. Biederman 6973455092SAl Viro #ifdef CONFIG_SYSCTL 7073455092SAl Viro struct ctl_table_set sysctls; 7173455092SAl Viro #endif 7295bdfccbSEric W. Biederman 738e602ce2SEric Dumazet struct sock *rtnl; /* rtnetlink socket */ 748e602ce2SEric Dumazet struct sock *genl_sock; 752774c7abSEric W. Biederman 76881d966bSEric W. Biederman struct list_head dev_base_head; 77881d966bSEric W. Biederman struct hlist_head *dev_name_head; 78881d966bSEric W. Biederman struct hlist_head *dev_index_head; 794e985adaSThomas Graf unsigned int dev_base_seq; /* protected by rtnl_mutex */ 80aa79e66eSPavel Emelyanov int ifindex; 8150624c93SEric W. Biederman unsigned int dev_unreg_count; 8297c53cacSDenis V. Lunev 835fd30ee7SDenis V. Lunev /* core fib_rules */ 845fd30ee7SDenis V. Lunev struct list_head rules_ops; 855fd30ee7SDenis V. Lunev 86d12d01d6SDenis V. Lunev 878e602ce2SEric Dumazet struct net_device *loopback_dev; /* The loopback */ 888efa6e93SPavel Emelyanov struct netns_core core; 89852566f5SPavel Emelyanov struct netns_mib mib; 902aaef4e4SDenis V. Lunev struct netns_packet packet; 91a0a53c8bSDenis V. Lunev struct netns_unix unx; 928afd351cSPavel Emelyanov struct netns_ipv4 ipv4; 93dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 94b0f159dbSDaniel Lezcano struct netns_ipv6 ipv6; 95b0f159dbSDaniel Lezcano #endif 96633fc86fSAlexander Aring #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 97633fc86fSAlexander Aring struct netns_ieee802154_lowpan ieee802154_lowpan; 98633fc86fSAlexander Aring #endif 994db67e80SEric W. Biederman #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 1004db67e80SEric W. Biederman struct netns_sctp sctp; 1014db67e80SEric W. Biederman #endif 10267019cc9SPavel Emelyanov #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 10367019cc9SPavel Emelyanov struct netns_dccp dccp; 10467019cc9SPavel Emelyanov #endif 1058d870052SAlexey Dobriyan #ifdef CONFIG_NETFILTER 106f3c1a44aSGao feng struct netns_nf nf; 1078d870052SAlexey Dobriyan struct netns_xt xt; 108dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 109dfdb8d79SAlexey Dobriyan struct netns_ct ct; 110dfdb8d79SAlexey Dobriyan #endif 11199633ab2SPablo Neira Ayuso #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 11299633ab2SPablo Neira Ayuso struct netns_nftables nft; 11399633ab2SPablo Neira Ayuso #endif 114c038a767SAmerigo Wang #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 115c038a767SAmerigo Wang struct netns_nf_frag nf_frag; 116c038a767SAmerigo Wang #endif 117cd8c20b6SAlexey Dobriyan struct sock *nfnl; 118cd8c20b6SAlexey Dobriyan struct sock *nfnl_stash; 1198d870052SAlexey Dobriyan #endif 1203d23e349SJohannes Berg #ifdef CONFIG_WEXT_CORE 121b333b3d2SJohannes Berg struct sk_buff_head wext_nlevents; 122b333b3d2SJohannes Berg #endif 1231c87733dSEric Dumazet struct net_generic __rcu *gen; 1248e602ce2SEric Dumazet 1258e602ce2SEric Dumazet /* Note : following structs are cache line aligned */ 1268e602ce2SEric Dumazet #ifdef CONFIG_XFRM 1278e602ce2SEric Dumazet struct netns_xfrm xfrm; 1288e602ce2SEric Dumazet #endif 1298b4d14d8SJunweiZhang #if IS_ENABLED(CONFIG_IP_VS) 13061b1ab45SHans Schillstrom struct netns_ipvs *ipvs; 1318b4d14d8SJunweiZhang #endif 1320189197fSEric W. Biederman #if IS_ENABLED(CONFIG_MPLS) 1330189197fSEric W. Biederman struct netns_mpls mpls; 1340189197fSEric W. Biederman #endif 13551d7cccfSAndrey Vagin struct sock *diag_nlsk; 1365aad1de5STimo Teräs atomic_t fnhe_genid; 1375f256becSEric W. Biederman }; 1385f256becSEric W. Biederman 139c0f39322SDenis V. Lunev #include <linux/seq_file_net.h> 140c0f39322SDenis V. Lunev 1414fabcd71SDaniel Lezcano /* Init's network namespace */ 1425f256becSEric W. Biederman extern struct net init_net; 143a4aa834aSDenis V. Lunev 144d727abcbSEric W. Biederman #ifdef CONFIG_NET_NS 145e67e16eaSJoe Perches struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 146e67e16eaSJoe Perches struct net *old_net); 147225c0a01SDenis V. Lunev 148d727abcbSEric W. Biederman #else /* CONFIG_NET_NS */ 149d727abcbSEric W. Biederman #include <linux/sched.h> 150d727abcbSEric W. Biederman #include <linux/nsproxy.h> 151038e7332SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, 152038e7332SEric W. Biederman struct user_namespace *user_ns, struct net *old_net) 1539dd776b6SEric W. Biederman { 154d727abcbSEric W. Biederman if (flags & CLONE_NEWNET) 155d727abcbSEric W. Biederman return ERR_PTR(-EINVAL); 156d727abcbSEric W. Biederman return old_net; 1579dd776b6SEric W. Biederman } 158d727abcbSEric W. Biederman #endif /* CONFIG_NET_NS */ 159225c0a01SDenis V. Lunev 160225c0a01SDenis V. Lunev 161225c0a01SDenis V. Lunev extern struct list_head net_namespace_list; 1629dd776b6SEric W. Biederman 163e67e16eaSJoe Perches struct net *get_net_ns_by_pid(pid_t pid); 164e67e16eaSJoe Perches struct net *get_net_ns_by_fd(int pid); 16530ffee84SJohannes Berg 166535d3ae9SRashika Kheria #ifdef CONFIG_SYSCTL 167535d3ae9SRashika Kheria void ipx_register_sysctl(void); 168535d3ae9SRashika Kheria void ipx_unregister_sysctl(void); 169535d3ae9SRashika Kheria #else 170535d3ae9SRashika Kheria #define ipx_register_sysctl() 171535d3ae9SRashika Kheria #define ipx_unregister_sysctl() 172535d3ae9SRashika Kheria #endif 173535d3ae9SRashika Kheria 174d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 175e67e16eaSJoe Perches void __put_net(struct net *net); 1765f256becSEric W. Biederman 1775f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 1785f256becSEric W. Biederman { 1795f256becSEric W. Biederman atomic_inc(&net->count); 1805f256becSEric W. Biederman return net; 1815f256becSEric W. Biederman } 1825f256becSEric W. Biederman 183077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 184077130c0SEric W. Biederman { 185077130c0SEric W. Biederman /* Used when we know struct net exists but we 186077130c0SEric W. Biederman * aren't guaranteed a previous reference count 187077130c0SEric W. Biederman * exists. If the reference count is zero this 188077130c0SEric W. Biederman * function fails and returns NULL. 189077130c0SEric W. Biederman */ 190077130c0SEric W. Biederman if (!atomic_inc_not_zero(&net->count)) 191077130c0SEric W. Biederman net = NULL; 192077130c0SEric W. Biederman return net; 193077130c0SEric W. Biederman } 194077130c0SEric W. Biederman 1955f256becSEric W. Biederman static inline void put_net(struct net *net) 1965f256becSEric W. Biederman { 1975f256becSEric W. Biederman if (atomic_dec_and_test(&net->count)) 1985f256becSEric W. Biederman __put_net(net); 1995f256becSEric W. Biederman } 2005f256becSEric W. Biederman 201878628fbSYOSHIFUJI Hideaki static inline 202878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 203878628fbSYOSHIFUJI Hideaki { 204878628fbSYOSHIFUJI Hideaki return net1 == net2; 205878628fbSYOSHIFUJI Hideaki } 206a685e089SAl Viro 207e67e16eaSJoe Perches void net_drop_ns(void *); 208a685e089SAl Viro 209d4655795SPavel Emelyanov #else 210b9f75f45SEric W. Biederman 211d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 212d4655795SPavel Emelyanov { 213d4655795SPavel Emelyanov return net; 214d4655795SPavel Emelyanov } 215d4655795SPavel Emelyanov 216d4655795SPavel Emelyanov static inline void put_net(struct net *net) 217d4655795SPavel Emelyanov { 218d4655795SPavel Emelyanov } 219d4655795SPavel Emelyanov 220d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 221d4655795SPavel Emelyanov { 222d4655795SPavel Emelyanov return net; 223d4655795SPavel Emelyanov } 224878628fbSYOSHIFUJI Hideaki 225878628fbSYOSHIFUJI Hideaki static inline 226878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 227878628fbSYOSHIFUJI Hideaki { 228878628fbSYOSHIFUJI Hideaki return 1; 229878628fbSYOSHIFUJI Hideaki } 230a685e089SAl Viro 231a685e089SAl Viro #define net_drop_ns NULL 232d4655795SPavel Emelyanov #endif 2335f256becSEric W. Biederman 2345d1e4468SDenis V. Lunev 2350c5c9fb5SEric W. Biederman typedef struct { 2368f424b5fSEric Dumazet #ifdef CONFIG_NET_NS 2370c5c9fb5SEric W. Biederman struct net *net; 2388f424b5fSEric Dumazet #endif 2390c5c9fb5SEric W. Biederman } possible_net_t; 2400c5c9fb5SEric W. Biederman 2410c5c9fb5SEric W. Biederman static inline void write_pnet(possible_net_t *pnet, struct net *net) 2420c5c9fb5SEric W. Biederman { 2430c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 2440c5c9fb5SEric W. Biederman pnet->net = net; 2450c5c9fb5SEric W. Biederman #endif 2460c5c9fb5SEric W. Biederman } 2470c5c9fb5SEric W. Biederman 2480c5c9fb5SEric W. Biederman static inline struct net *read_pnet(const possible_net_t *pnet) 2490c5c9fb5SEric W. Biederman { 2500c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 2510c5c9fb5SEric W. Biederman return pnet->net; 2520c5c9fb5SEric W. Biederman #else 2530c5c9fb5SEric W. Biederman return &init_net; 2540c5c9fb5SEric W. Biederman #endif 2550c5c9fb5SEric W. Biederman } 2565d1e4468SDenis V. Lunev 2575f256becSEric W. Biederman #define for_each_net(VAR) \ 2585f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 2595f256becSEric W. Biederman 26011a28d37SJohannes Berg #define for_each_net_rcu(VAR) \ 26111a28d37SJohannes Berg list_for_each_entry_rcu(VAR, &net_namespace_list, list) 26211a28d37SJohannes Berg 2634665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 2644665079cSPavel Emelyanov #define __net_init 2654665079cSPavel Emelyanov #define __net_exit 266022cbae6SDenis V. Lunev #define __net_initdata 26704a6f82cSAndi Kleen #define __net_initconst 2684665079cSPavel Emelyanov #else 2694665079cSPavel Emelyanov #define __net_init __init 2704665079cSPavel Emelyanov #define __net_exit __exit_refok 271022cbae6SDenis V. Lunev #define __net_initdata __initdata 27204a6f82cSAndi Kleen #define __net_initconst __initconst 2734665079cSPavel Emelyanov #endif 2745f256becSEric W. Biederman 2757a0877d4SNicolas Dichtel int peernet2id_alloc(struct net *net, struct net *peer); 27659324cf3SNicolas Dichtel int peernet2id(struct net *net, struct net *peer); 27759324cf3SNicolas Dichtel bool peernet_has_id(struct net *net, struct net *peer); 2780c7aecd4SNicolas Dichtel struct net *get_net_ns_by_id(struct net *net, int id); 2790c7aecd4SNicolas Dichtel 2805f256becSEric W. Biederman struct pernet_operations { 2815f256becSEric W. Biederman struct list_head list; 2825f256becSEric W. Biederman int (*init)(struct net *net); 2835f256becSEric W. Biederman void (*exit)(struct net *net); 28472ad937aSEric W. Biederman void (*exit_batch)(struct list_head *net_exit_list); 285f875bae0SEric W. Biederman int *id; 286f875bae0SEric W. Biederman size_t size; 2875f256becSEric W. Biederman }; 2885f256becSEric W. Biederman 28917edde52SEric W. Biederman /* 29017edde52SEric W. Biederman * Use these carefully. If you implement a network device and it 29117edde52SEric W. Biederman * needs per network namespace operations use device pernet operations, 29217edde52SEric W. Biederman * otherwise use pernet subsys operations. 29317edde52SEric W. Biederman * 2944edf547bSJohannes Berg * Network interfaces need to be removed from a dying netns _before_ 2954edf547bSJohannes Berg * subsys notifiers can be called, as most of the network code cleanup 2964edf547bSJohannes Berg * (which is done from subsys notifiers) runs with the assumption that 2974edf547bSJohannes Berg * dev_remove_pack has been called so no new packets will arrive during 2984edf547bSJohannes Berg * and after the cleanup functions have been called. dev_remove_pack 2994edf547bSJohannes Berg * is not per namespace so instead the guarantee of no more packets 3004edf547bSJohannes Berg * arriving in a network namespace is provided by ensuring that all 3014edf547bSJohannes Berg * network devices and all sockets have left the network namespace 3024edf547bSJohannes Berg * before the cleanup methods are called. 30317edde52SEric W. Biederman * 30417edde52SEric W. Biederman * For the longest time the ipv4 icmp code was registered as a pernet 30517edde52SEric W. Biederman * device which caused kernel oops, and panics during network 30617edde52SEric W. Biederman * namespace cleanup. So please don't get this wrong. 30717edde52SEric W. Biederman */ 308e67e16eaSJoe Perches int register_pernet_subsys(struct pernet_operations *); 309e67e16eaSJoe Perches void unregister_pernet_subsys(struct pernet_operations *); 310e67e16eaSJoe Perches int register_pernet_device(struct pernet_operations *); 311e67e16eaSJoe Perches void unregister_pernet_device(struct pernet_operations *); 312f875bae0SEric W. Biederman 31395bdfccbSEric W. Biederman struct ctl_table; 31495bdfccbSEric W. Biederman struct ctl_table_header; 315d62c612eSPavel Emelyanov 3162ca794e5SEric W. Biederman #ifdef CONFIG_SYSCTL 317e67e16eaSJoe Perches int net_sysctl_init(void); 318e67e16eaSJoe Perches struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 319e67e16eaSJoe Perches struct ctl_table *table); 320e67e16eaSJoe Perches void unregister_net_sysctl_table(struct ctl_table_header *header); 32148c74958SEric W. Biederman #else 32248c74958SEric W. Biederman static inline int net_sysctl_init(void) { return 0; } 32348c74958SEric W. Biederman static inline struct ctl_table_header *register_net_sysctl(struct net *net, 32448c74958SEric W. Biederman const char *path, struct ctl_table *table) 32548c74958SEric W. Biederman { 32648c74958SEric W. Biederman return NULL; 32748c74958SEric W. Biederman } 32848c74958SEric W. Biederman static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 32948c74958SEric W. Biederman { 33048c74958SEric W. Biederman } 33148c74958SEric W. Biederman #endif 33248c74958SEric W. Biederman 333ca4c3fc2Sfan.du static inline int rt_genid_ipv4(struct net *net) 334b42664f8SNicolas Dichtel { 335ca4c3fc2Sfan.du return atomic_read(&net->ipv4.rt_genid); 336b42664f8SNicolas Dichtel } 337b42664f8SNicolas Dichtel 338ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv4(struct net *net) 339b42664f8SNicolas Dichtel { 340ca4c3fc2Sfan.du atomic_inc(&net->ipv4.rt_genid); 341ca4c3fc2Sfan.du } 342ca4c3fc2Sfan.du 343705f1c86SHannes Frederic Sowa extern void (*__fib6_flush_trees)(struct net *net); 344ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv6(struct net *net) 345ca4c3fc2Sfan.du { 346705f1c86SHannes Frederic Sowa if (__fib6_flush_trees) 347705f1c86SHannes Frederic Sowa __fib6_flush_trees(net); 348ca4c3fc2Sfan.du } 349ca4c3fc2Sfan.du 350599018a7SLuis R. Rodriguez #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 351599018a7SLuis R. Rodriguez static inline struct netns_ieee802154_lowpan * 352599018a7SLuis R. Rodriguez net_ieee802154_lowpan(struct net *net) 353599018a7SLuis R. Rodriguez { 354599018a7SLuis R. Rodriguez return &net->ieee802154_lowpan; 355599018a7SLuis R. Rodriguez } 356599018a7SLuis R. Rodriguez #endif 357599018a7SLuis R. Rodriguez 358ca4c3fc2Sfan.du /* For callers who don't really care about whether it's IPv4 or IPv6 */ 359ca4c3fc2Sfan.du static inline void rt_genid_bump_all(struct net *net) 360ca4c3fc2Sfan.du { 361ca4c3fc2Sfan.du rt_genid_bump_ipv4(net); 362ca4c3fc2Sfan.du rt_genid_bump_ipv6(net); 363b42664f8SNicolas Dichtel } 36495bdfccbSEric W. Biederman 3655aad1de5STimo Teräs static inline int fnhe_genid(struct net *net) 3665aad1de5STimo Teräs { 3675aad1de5STimo Teräs return atomic_read(&net->fnhe_genid); 3685aad1de5STimo Teräs } 3695aad1de5STimo Teräs 3705aad1de5STimo Teräs static inline void fnhe_genid_bump(struct net *net) 3715aad1de5STimo Teräs { 3725aad1de5STimo Teräs atomic_inc(&net->fnhe_genid); 3735aad1de5STimo Teräs } 3745aad1de5STimo Teräs 3755f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 376