1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 25f256becSEric W. Biederman /* 35f256becSEric W. Biederman * Operations on the network namespace 45f256becSEric W. Biederman */ 55f256becSEric W. Biederman #ifndef __NET_NET_NAMESPACE_H 65f256becSEric W. Biederman #define __NET_NET_NAMESPACE_H 75f256becSEric W. Biederman 860063497SArun Sharma #include <linux/atomic.h> 9c122e14dSReshetova, Elena #include <linux/refcount.h> 105f256becSEric W. Biederman #include <linux/workqueue.h> 115f256becSEric W. Biederman #include <linux/list.h> 12bee95250SDavid S. Miller #include <linux/sysctl.h> 13fbdeaed4STyler Hicks #include <linux/uidgid.h> 145f256becSEric W. Biederman 156a662719SCong Wang #include <net/flow.h> 168efa6e93SPavel Emelyanov #include <net/netns/core.h> 17852566f5SPavel Emelyanov #include <net/netns/mib.h> 18a0a53c8bSDenis V. Lunev #include <net/netns/unix.h> 192aaef4e4SDenis V. Lunev #include <net/netns/packet.h> 208afd351cSPavel Emelyanov #include <net/netns/ipv4.h> 21b0f159dbSDaniel Lezcano #include <net/netns/ipv6.h> 22ab84be7eSDavid Ahern #include <net/netns/nexthop.h> 23633fc86fSAlexander Aring #include <net/netns/ieee802154_6lowpan.h> 244db67e80SEric W. Biederman #include <net/netns/sctp.h> 2567019cc9SPavel Emelyanov #include <net/netns/dccp.h> 26f3c1a44aSGao feng #include <net/netns/netfilter.h> 278d870052SAlexey Dobriyan #include <net/netns/x_tables.h> 28dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 29dfdb8d79SAlexey Dobriyan #include <net/netns/conntrack.h> 30dfdb8d79SAlexey Dobriyan #endif 3199633ab2SPablo Neira Ayuso #include <net/netns/nftables.h> 32d62ddc21SAlexey Dobriyan #include <net/netns/xfrm.h> 330189197fSEric W. Biederman #include <net/netns/mpls.h> 348e8cda6dSMario Kicherer #include <net/netns/can.h> 351d0dc069SBjörn Töpel #include <net/netns/xdp.h> 36435d5f4bSAl Viro #include <linux/ns_common.h> 3704c52decSPablo Neira Ayuso #include <linux/idr.h> 3804c52decSPablo Neira Ayuso #include <linux/skbuff.h> 39a30c7b42SJiri Pirko #include <linux/notifier.h> 40a0a53c8bSDenis V. Lunev 41038e7332SEric W. Biederman struct user_namespace; 42457c4cbcSEric W. Biederman struct proc_dir_entry; 432774c7abSEric W. Biederman struct net_device; 4497c53cacSDenis V. Lunev struct sock; 451597fbc0SPavel Emelyanov struct ctl_table_header; 46dec827d1SPavel Emelyanov struct net_generic; 4794e5e308SChristian Brauner struct uevent_sock; 482553d064SJulian Anastasov struct netns_ipvs; 49d58e468bSPetar Penkov struct bpf_prog; 501597fbc0SPavel Emelyanov 517c28bd0bSEric Dumazet 527c28bd0bSEric Dumazet #define NETDEV_HASHBITS 8 537c28bd0bSEric Dumazet #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 547c28bd0bSEric Dumazet 555f256becSEric W. Biederman struct net { 562a06b898SEric Dumazet /* First cache line can be often dirtied. 572a06b898SEric Dumazet * Do not place here read-mostly fields. 582a06b898SEric Dumazet */ 59aad12c23SMike Rapoport refcount_t passive; /* To decide when the network 605f256becSEric W. Biederman * namespace should be freed. 615f256becSEric W. Biederman */ 62273c28bcSKirill Tkhai refcount_t count; /* To decided when the network 63a685e089SAl Viro * namespace should be shut down. 64a685e089SAl Viro */ 658e602ce2SEric Dumazet spinlock_t rules_mod_lock; 668e602ce2SEric Dumazet 672a06b898SEric Dumazet unsigned int dev_unreg_count; 682a06b898SEric Dumazet 692a06b898SEric Dumazet unsigned int dev_base_seq; /* protected by rtnl_mutex */ 702a06b898SEric Dumazet int ifindex; 712a06b898SEric Dumazet 722a06b898SEric Dumazet spinlock_t nsid_lock; 732a06b898SEric Dumazet atomic_t fnhe_genid; 7433cf7c90SEric Dumazet 755f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 7619efbd93SKirill Tkhai struct list_head exit_list; /* To linked to call pernet exit 774420bf21SKirill Tkhai * methods on dead net ( 784420bf21SKirill Tkhai * pernet_ops_rwsem read locked), 794420bf21SKirill Tkhai * or to unregister pernet ops 804420bf21SKirill Tkhai * (pernet_ops_rwsem write locked). 8119efbd93SKirill Tkhai */ 8265b7b5b9SKirill Tkhai struct llist_node cleanup_list; /* namespaces on death row */ 8365b7b5b9SKirill Tkhai 849b242610SDavid Howells #ifdef CONFIG_KEYS 859b242610SDavid Howells struct key_tag *key_domain; /* Key domain of operation tag */ 869b242610SDavid Howells #endif 87038e7332SEric W. Biederman struct user_namespace *user_ns; /* Owning user namespace */ 8870328660SEric W. Biederman struct ucounts *ucounts; 890c7aecd4SNicolas Dichtel struct idr netns_ids; 90038e7332SEric W. Biederman 91435d5f4bSAl Viro struct ns_common ns; 9298f842e6SEric W. Biederman 932a06b898SEric Dumazet struct list_head dev_base_head; 94457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 95457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 96881d966bSEric W. Biederman 9773455092SAl Viro #ifdef CONFIG_SYSCTL 9873455092SAl Viro struct ctl_table_set sysctls; 9973455092SAl Viro #endif 10095bdfccbSEric W. Biederman 1018e602ce2SEric Dumazet struct sock *rtnl; /* rtnetlink socket */ 1028e602ce2SEric Dumazet struct sock *genl_sock; 1032774c7abSEric W. Biederman 10494e5e308SChristian Brauner struct uevent_sock *uevent_sock; /* uevent socket */ 10594e5e308SChristian Brauner 106881d966bSEric W. Biederman struct hlist_head *dev_name_head; 107881d966bSEric W. Biederman struct hlist_head *dev_index_head; 108a30c7b42SJiri Pirko struct raw_notifier_head netdev_chain; 109a30c7b42SJiri Pirko 1102a06b898SEric Dumazet /* Note that @hash_mix can be read millions times per second, 1112a06b898SEric Dumazet * it is critical that it is on a read_mostly cache line. 1122a06b898SEric Dumazet */ 1132a06b898SEric Dumazet u32 hash_mix; 1142a06b898SEric Dumazet 1152a06b898SEric Dumazet struct net_device *loopback_dev; /* The loopback */ 11697c53cacSDenis V. Lunev 1175fd30ee7SDenis V. Lunev /* core fib_rules */ 1185fd30ee7SDenis V. Lunev struct list_head rules_ops; 1195fd30ee7SDenis V. Lunev 1208efa6e93SPavel Emelyanov struct netns_core core; 121852566f5SPavel Emelyanov struct netns_mib mib; 1222aaef4e4SDenis V. Lunev struct netns_packet packet; 123a0a53c8bSDenis V. Lunev struct netns_unix unx; 124ab84be7eSDavid Ahern struct netns_nexthop nexthop; 1258afd351cSPavel Emelyanov struct netns_ipv4 ipv4; 126dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 127b0f159dbSDaniel Lezcano struct netns_ipv6 ipv6; 128b0f159dbSDaniel Lezcano #endif 129633fc86fSAlexander Aring #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 130633fc86fSAlexander Aring struct netns_ieee802154_lowpan ieee802154_lowpan; 131633fc86fSAlexander Aring #endif 1324db67e80SEric W. Biederman #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 1334db67e80SEric W. Biederman struct netns_sctp sctp; 1344db67e80SEric W. Biederman #endif 13567019cc9SPavel Emelyanov #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 13667019cc9SPavel Emelyanov struct netns_dccp dccp; 13767019cc9SPavel Emelyanov #endif 1388d870052SAlexey Dobriyan #ifdef CONFIG_NETFILTER 139f3c1a44aSGao feng struct netns_nf nf; 1408d870052SAlexey Dobriyan struct netns_xt xt; 141dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 142dfdb8d79SAlexey Dobriyan struct netns_ct ct; 143dfdb8d79SAlexey Dobriyan #endif 14499633ab2SPablo Neira Ayuso #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 14599633ab2SPablo Neira Ayuso struct netns_nftables nft; 14699633ab2SPablo Neira Ayuso #endif 147c038a767SAmerigo Wang #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 148c038a767SAmerigo Wang struct netns_nf_frag nf_frag; 1499ce7bc03SEric Dumazet struct ctl_table_header *nf_frag_frags_hdr; 150c038a767SAmerigo Wang #endif 151cd8c20b6SAlexey Dobriyan struct sock *nfnl; 152cd8c20b6SAlexey Dobriyan struct sock *nfnl_stash; 1533499abb2SAndreas Schultz #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT) 1543499abb2SAndreas Schultz struct list_head nfnl_acct_list; 1553499abb2SAndreas Schultz #endif 15619576c94SPablo Neira #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) 15719576c94SPablo Neira struct list_head nfct_timeout_list; 15819576c94SPablo Neira #endif 1598d870052SAlexey Dobriyan #endif 1603d23e349SJohannes Berg #ifdef CONFIG_WEXT_CORE 161b333b3d2SJohannes Berg struct sk_buff_head wext_nlevents; 162b333b3d2SJohannes Berg #endif 1631c87733dSEric Dumazet struct net_generic __rcu *gen; 1648e602ce2SEric Dumazet 165d58e468bSPetar Penkov struct bpf_prog __rcu *flow_dissector_prog; 166d58e468bSPetar Penkov 1678e602ce2SEric Dumazet /* Note : following structs are cache line aligned */ 1688e602ce2SEric Dumazet #ifdef CONFIG_XFRM 1698e602ce2SEric Dumazet struct netns_xfrm xfrm; 1708e602ce2SEric Dumazet #endif 171f318903cSDaniel Borkmann 172f318903cSDaniel Borkmann atomic64_t net_cookie; /* written once */ 173f318903cSDaniel Borkmann 1748b4d14d8SJunweiZhang #if IS_ENABLED(CONFIG_IP_VS) 17561b1ab45SHans Schillstrom struct netns_ipvs *ipvs; 1768b4d14d8SJunweiZhang #endif 1770189197fSEric W. Biederman #if IS_ENABLED(CONFIG_MPLS) 1780189197fSEric W. Biederman struct netns_mpls mpls; 1790189197fSEric W. Biederman #endif 1808e8cda6dSMario Kicherer #if IS_ENABLED(CONFIG_CAN) 1818e8cda6dSMario Kicherer struct netns_can can; 1828e8cda6dSMario Kicherer #endif 1831d0dc069SBjörn Töpel #ifdef CONFIG_XDP_SOCKETS 1841d0dc069SBjörn Töpel struct netns_xdp xdp; 1851d0dc069SBjörn Töpel #endif 18691b05a7eSOndrej Mosnacek #if IS_ENABLED(CONFIG_CRYPTO_USER) 18791b05a7eSOndrej Mosnacek struct sock *crypto_nlsk; 18891b05a7eSOndrej Mosnacek #endif 18951d7cccfSAndrey Vagin struct sock *diag_nlsk; 1903859a271SKees Cook } __randomize_layout; 1915f256becSEric W. Biederman 192c0f39322SDenis V. Lunev #include <linux/seq_file_net.h> 193c0f39322SDenis V. Lunev 1944fabcd71SDaniel Lezcano /* Init's network namespace */ 1955f256becSEric W. Biederman extern struct net init_net; 196a4aa834aSDenis V. Lunev 197d727abcbSEric W. Biederman #ifdef CONFIG_NET_NS 198e67e16eaSJoe Perches struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 199e67e16eaSJoe Perches struct net *old_net); 200225c0a01SDenis V. Lunev 201fbdeaed4STyler Hicks void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid); 202fbdeaed4STyler Hicks 2037866cc57SFlorian Westphal void net_ns_barrier(void); 204d727abcbSEric W. Biederman #else /* CONFIG_NET_NS */ 205d727abcbSEric W. Biederman #include <linux/sched.h> 206d727abcbSEric W. Biederman #include <linux/nsproxy.h> 207038e7332SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, 208038e7332SEric W. Biederman struct user_namespace *user_ns, struct net *old_net) 2099dd776b6SEric W. Biederman { 210d727abcbSEric W. Biederman if (flags & CLONE_NEWNET) 211d727abcbSEric W. Biederman return ERR_PTR(-EINVAL); 212d727abcbSEric W. Biederman return old_net; 2139dd776b6SEric W. Biederman } 2147866cc57SFlorian Westphal 215fbdeaed4STyler Hicks static inline void net_ns_get_ownership(const struct net *net, 216fbdeaed4STyler Hicks kuid_t *uid, kgid_t *gid) 217fbdeaed4STyler Hicks { 218fbdeaed4STyler Hicks *uid = GLOBAL_ROOT_UID; 219fbdeaed4STyler Hicks *gid = GLOBAL_ROOT_GID; 220fbdeaed4STyler Hicks } 221fbdeaed4STyler Hicks 2227866cc57SFlorian Westphal static inline void net_ns_barrier(void) {} 223d727abcbSEric W. Biederman #endif /* CONFIG_NET_NS */ 224225c0a01SDenis V. Lunev 225225c0a01SDenis V. Lunev 226225c0a01SDenis V. Lunev extern struct list_head net_namespace_list; 2279dd776b6SEric W. Biederman 228e67e16eaSJoe Perches struct net *get_net_ns_by_pid(pid_t pid); 2290f5258cdSStefan Hajnoczi struct net *get_net_ns_by_fd(int fd); 23030ffee84SJohannes Berg 231535d3ae9SRashika Kheria #ifdef CONFIG_SYSCTL 232535d3ae9SRashika Kheria void ipx_register_sysctl(void); 233535d3ae9SRashika Kheria void ipx_unregister_sysctl(void); 234535d3ae9SRashika Kheria #else 235535d3ae9SRashika Kheria #define ipx_register_sysctl() 236535d3ae9SRashika Kheria #define ipx_unregister_sysctl() 237535d3ae9SRashika Kheria #endif 238535d3ae9SRashika Kheria 239d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 240e67e16eaSJoe Perches void __put_net(struct net *net); 2415f256becSEric W. Biederman 2425f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 2435f256becSEric W. Biederman { 244273c28bcSKirill Tkhai refcount_inc(&net->count); 2455f256becSEric W. Biederman return net; 2465f256becSEric W. Biederman } 2475f256becSEric W. Biederman 248077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 249077130c0SEric W. Biederman { 250077130c0SEric W. Biederman /* Used when we know struct net exists but we 251077130c0SEric W. Biederman * aren't guaranteed a previous reference count 252077130c0SEric W. Biederman * exists. If the reference count is zero this 253077130c0SEric W. Biederman * function fails and returns NULL. 254077130c0SEric W. Biederman */ 255273c28bcSKirill Tkhai if (!refcount_inc_not_zero(&net->count)) 256077130c0SEric W. Biederman net = NULL; 257077130c0SEric W. Biederman return net; 258077130c0SEric W. Biederman } 259077130c0SEric W. Biederman 2605f256becSEric W. Biederman static inline void put_net(struct net *net) 2615f256becSEric W. Biederman { 262273c28bcSKirill Tkhai if (refcount_dec_and_test(&net->count)) 2635f256becSEric W. Biederman __put_net(net); 2645f256becSEric W. Biederman } 2655f256becSEric W. Biederman 266878628fbSYOSHIFUJI Hideaki static inline 267878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 268878628fbSYOSHIFUJI Hideaki { 269878628fbSYOSHIFUJI Hideaki return net1 == net2; 270878628fbSYOSHIFUJI Hideaki } 271a685e089SAl Viro 2724ee806d5SDan Streetman static inline int check_net(const struct net *net) 2734ee806d5SDan Streetman { 2743e3ab9ccSDavid S. Miller return refcount_read(&net->count) != 0; 2754ee806d5SDan Streetman } 2764ee806d5SDan Streetman 277e67e16eaSJoe Perches void net_drop_ns(void *); 278a685e089SAl Viro 279f318903cSDaniel Borkmann u64 net_gen_cookie(struct net *net); 280f318903cSDaniel Borkmann 281d4655795SPavel Emelyanov #else 282b9f75f45SEric W. Biederman 283d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 284d4655795SPavel Emelyanov { 285d4655795SPavel Emelyanov return net; 286d4655795SPavel Emelyanov } 287d4655795SPavel Emelyanov 288d4655795SPavel Emelyanov static inline void put_net(struct net *net) 289d4655795SPavel Emelyanov { 290d4655795SPavel Emelyanov } 291d4655795SPavel Emelyanov 292d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 293d4655795SPavel Emelyanov { 294d4655795SPavel Emelyanov return net; 295d4655795SPavel Emelyanov } 296878628fbSYOSHIFUJI Hideaki 297878628fbSYOSHIFUJI Hideaki static inline 298878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 299878628fbSYOSHIFUJI Hideaki { 300878628fbSYOSHIFUJI Hideaki return 1; 301878628fbSYOSHIFUJI Hideaki } 302a685e089SAl Viro 3034ee806d5SDan Streetman static inline int check_net(const struct net *net) 3044ee806d5SDan Streetman { 3054ee806d5SDan Streetman return 1; 3064ee806d5SDan Streetman } 3074ee806d5SDan Streetman 308f318903cSDaniel Borkmann static inline u64 net_gen_cookie(struct net *net) 309f318903cSDaniel Borkmann { 310f318903cSDaniel Borkmann return 0; 311f318903cSDaniel Borkmann } 312f318903cSDaniel Borkmann 313a685e089SAl Viro #define net_drop_ns NULL 314d4655795SPavel Emelyanov #endif 3155f256becSEric W. Biederman 3165d1e4468SDenis V. Lunev 3170c5c9fb5SEric W. Biederman typedef struct { 3188f424b5fSEric Dumazet #ifdef CONFIG_NET_NS 3190c5c9fb5SEric W. Biederman struct net *net; 3208f424b5fSEric Dumazet #endif 3210c5c9fb5SEric W. Biederman } possible_net_t; 3220c5c9fb5SEric W. Biederman 3230c5c9fb5SEric W. Biederman static inline void write_pnet(possible_net_t *pnet, struct net *net) 3240c5c9fb5SEric W. Biederman { 3250c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 3260c5c9fb5SEric W. Biederman pnet->net = net; 3270c5c9fb5SEric W. Biederman #endif 3280c5c9fb5SEric W. Biederman } 3290c5c9fb5SEric W. Biederman 3300c5c9fb5SEric W. Biederman static inline struct net *read_pnet(const possible_net_t *pnet) 3310c5c9fb5SEric W. Biederman { 3320c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 3330c5c9fb5SEric W. Biederman return pnet->net; 3340c5c9fb5SEric W. Biederman #else 3350c5c9fb5SEric W. Biederman return &init_net; 3360c5c9fb5SEric W. Biederman #endif 3370c5c9fb5SEric W. Biederman } 3385d1e4468SDenis V. Lunev 339f0b07bb1SKirill Tkhai /* Protected by net_rwsem */ 3405f256becSEric W. Biederman #define for_each_net(VAR) \ 3415f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 342afa0df59SJiri Pirko #define for_each_net_continue_reverse(VAR) \ 343afa0df59SJiri Pirko list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list) 34411a28d37SJohannes Berg #define for_each_net_rcu(VAR) \ 34511a28d37SJohannes Berg list_for_each_entry_rcu(VAR, &net_namespace_list, list) 34611a28d37SJohannes Berg 3474665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 3484665079cSPavel Emelyanov #define __net_init 3494665079cSPavel Emelyanov #define __net_exit 350022cbae6SDenis V. Lunev #define __net_initdata 35104a6f82cSAndi Kleen #define __net_initconst 3524665079cSPavel Emelyanov #else 3534665079cSPavel Emelyanov #define __net_init __init 354bd721ea7SFabian Frederick #define __net_exit __ref 355022cbae6SDenis V. Lunev #define __net_initdata __initdata 35604a6f82cSAndi Kleen #define __net_initconst __initconst 3574665079cSPavel Emelyanov #endif 3585f256becSEric W. Biederman 359d4e4fdf9SGuillaume Nault int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp); 36056f200c7SGuillaume Nault int peernet2id(const struct net *net, struct net *peer); 36156f200c7SGuillaume Nault bool peernet_has_id(const struct net *net, struct net *peer); 36256f200c7SGuillaume Nault struct net *get_net_ns_by_id(const struct net *net, int id); 3630c7aecd4SNicolas Dichtel 3645f256becSEric W. Biederman struct pernet_operations { 3655f256becSEric W. Biederman struct list_head list; 3666056415dSKirill Tkhai /* 3676056415dSKirill Tkhai * Below methods are called without any exclusive locks. 3686056415dSKirill Tkhai * More than one net may be constructed and destructed 3696056415dSKirill Tkhai * in parallel on several cpus. Every pernet_operations 3706056415dSKirill Tkhai * have to keep in mind all other pernet_operations and 3716056415dSKirill Tkhai * to introduce a locking, if they share common resources. 3726056415dSKirill Tkhai * 3738518e9bbSKirill Tkhai * The only time they are called with exclusive lock is 3748518e9bbSKirill Tkhai * from register_pernet_subsys(), unregister_pernet_subsys() 3758518e9bbSKirill Tkhai * register_pernet_device() and unregister_pernet_device(). 3768518e9bbSKirill Tkhai * 3776056415dSKirill Tkhai * Exit methods using blocking RCU primitives, such as 3786056415dSKirill Tkhai * synchronize_rcu(), should be implemented via exit_batch. 3796056415dSKirill Tkhai * Then, destruction of a group of net requires single 3806056415dSKirill Tkhai * synchronize_rcu() related to these pernet_operations, 3816056415dSKirill Tkhai * instead of separate synchronize_rcu() for every net. 3826056415dSKirill Tkhai * Please, avoid synchronize_rcu() at all, where it's possible. 383d7d99872SEric Dumazet * 384d7d99872SEric Dumazet * Note that a combination of pre_exit() and exit() can 385d7d99872SEric Dumazet * be used, since a synchronize_rcu() is guaranteed between 386d7d99872SEric Dumazet * the calls. 3876056415dSKirill Tkhai */ 3885f256becSEric W. Biederman int (*init)(struct net *net); 389d7d99872SEric Dumazet void (*pre_exit)(struct net *net); 3905f256becSEric W. Biederman void (*exit)(struct net *net); 39172ad937aSEric W. Biederman void (*exit_batch)(struct list_head *net_exit_list); 392c7d03a00SAlexey Dobriyan unsigned int *id; 393f875bae0SEric W. Biederman size_t size; 3945f256becSEric W. Biederman }; 3955f256becSEric W. Biederman 39617edde52SEric W. Biederman /* 39717edde52SEric W. Biederman * Use these carefully. If you implement a network device and it 39817edde52SEric W. Biederman * needs per network namespace operations use device pernet operations, 39917edde52SEric W. Biederman * otherwise use pernet subsys operations. 40017edde52SEric W. Biederman * 4014edf547bSJohannes Berg * Network interfaces need to be removed from a dying netns _before_ 4024edf547bSJohannes Berg * subsys notifiers can be called, as most of the network code cleanup 4034edf547bSJohannes Berg * (which is done from subsys notifiers) runs with the assumption that 4044edf547bSJohannes Berg * dev_remove_pack has been called so no new packets will arrive during 4054edf547bSJohannes Berg * and after the cleanup functions have been called. dev_remove_pack 4064edf547bSJohannes Berg * is not per namespace so instead the guarantee of no more packets 4074edf547bSJohannes Berg * arriving in a network namespace is provided by ensuring that all 4084edf547bSJohannes Berg * network devices and all sockets have left the network namespace 4094edf547bSJohannes Berg * before the cleanup methods are called. 41017edde52SEric W. Biederman * 41117edde52SEric W. Biederman * For the longest time the ipv4 icmp code was registered as a pernet 41217edde52SEric W. Biederman * device which caused kernel oops, and panics during network 41317edde52SEric W. Biederman * namespace cleanup. So please don't get this wrong. 41417edde52SEric W. Biederman */ 415e67e16eaSJoe Perches int register_pernet_subsys(struct pernet_operations *); 416e67e16eaSJoe Perches void unregister_pernet_subsys(struct pernet_operations *); 417e67e16eaSJoe Perches int register_pernet_device(struct pernet_operations *); 418e67e16eaSJoe Perches void unregister_pernet_device(struct pernet_operations *); 419f875bae0SEric W. Biederman 42095bdfccbSEric W. Biederman struct ctl_table; 42195bdfccbSEric W. Biederman struct ctl_table_header; 422d62c612eSPavel Emelyanov 4232ca794e5SEric W. Biederman #ifdef CONFIG_SYSCTL 424e67e16eaSJoe Perches int net_sysctl_init(void); 425e67e16eaSJoe Perches struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 426e67e16eaSJoe Perches struct ctl_table *table); 427e67e16eaSJoe Perches void unregister_net_sysctl_table(struct ctl_table_header *header); 42848c74958SEric W. Biederman #else 42948c74958SEric W. Biederman static inline int net_sysctl_init(void) { return 0; } 43048c74958SEric W. Biederman static inline struct ctl_table_header *register_net_sysctl(struct net *net, 43148c74958SEric W. Biederman const char *path, struct ctl_table *table) 43248c74958SEric W. Biederman { 43348c74958SEric W. Biederman return NULL; 43448c74958SEric W. Biederman } 43548c74958SEric W. Biederman static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 43648c74958SEric W. Biederman { 43748c74958SEric W. Biederman } 43848c74958SEric W. Biederman #endif 43948c74958SEric W. Biederman 44056f200c7SGuillaume Nault static inline int rt_genid_ipv4(const struct net *net) 441b42664f8SNicolas Dichtel { 442ca4c3fc2Sfan.du return atomic_read(&net->ipv4.rt_genid); 443b42664f8SNicolas Dichtel } 444b42664f8SNicolas Dichtel 445ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv4(struct net *net) 446b42664f8SNicolas Dichtel { 447ca4c3fc2Sfan.du atomic_inc(&net->ipv4.rt_genid); 448ca4c3fc2Sfan.du } 449ca4c3fc2Sfan.du 450705f1c86SHannes Frederic Sowa extern void (*__fib6_flush_trees)(struct net *net); 451ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv6(struct net *net) 452ca4c3fc2Sfan.du { 453705f1c86SHannes Frederic Sowa if (__fib6_flush_trees) 454705f1c86SHannes Frederic Sowa __fib6_flush_trees(net); 455ca4c3fc2Sfan.du } 456ca4c3fc2Sfan.du 457599018a7SLuis R. Rodriguez #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 458599018a7SLuis R. Rodriguez static inline struct netns_ieee802154_lowpan * 459599018a7SLuis R. Rodriguez net_ieee802154_lowpan(struct net *net) 460599018a7SLuis R. Rodriguez { 461599018a7SLuis R. Rodriguez return &net->ieee802154_lowpan; 462599018a7SLuis R. Rodriguez } 463599018a7SLuis R. Rodriguez #endif 464599018a7SLuis R. Rodriguez 465ca4c3fc2Sfan.du /* For callers who don't really care about whether it's IPv4 or IPv6 */ 466ca4c3fc2Sfan.du static inline void rt_genid_bump_all(struct net *net) 467ca4c3fc2Sfan.du { 468ca4c3fc2Sfan.du rt_genid_bump_ipv4(net); 469ca4c3fc2Sfan.du rt_genid_bump_ipv6(net); 470b42664f8SNicolas Dichtel } 47195bdfccbSEric W. Biederman 47256f200c7SGuillaume Nault static inline int fnhe_genid(const struct net *net) 4735aad1de5STimo Teräs { 4745aad1de5STimo Teräs return atomic_read(&net->fnhe_genid); 4755aad1de5STimo Teräs } 4765aad1de5STimo Teräs 4775aad1de5STimo Teräs static inline void fnhe_genid_bump(struct net *net) 4785aad1de5STimo Teräs { 4795aad1de5STimo Teräs atomic_inc(&net->fnhe_genid); 4805aad1de5STimo Teräs } 4815aad1de5STimo Teräs 4825f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 483