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> 25f3c1a44aSGao feng #include <net/netns/netfilter.h> 268d870052SAlexey Dobriyan #include <net/netns/x_tables.h> 27dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 28dfdb8d79SAlexey Dobriyan #include <net/netns/conntrack.h> 29dfdb8d79SAlexey Dobriyan #endif 3099633ab2SPablo Neira Ayuso #include <net/netns/nftables.h> 31d62ddc21SAlexey Dobriyan #include <net/netns/xfrm.h> 320189197fSEric W. Biederman #include <net/netns/mpls.h> 338e8cda6dSMario Kicherer #include <net/netns/can.h> 341d0dc069SBjörn Töpel #include <net/netns/xdp.h> 35*194730a9SGuvenc Gulce #include <net/netns/smc.h> 36a3fd7ceeSJakub Sitnicki #include <net/netns/bpf.h> 37435d5f4bSAl Viro #include <linux/ns_common.h> 3804c52decSPablo Neira Ayuso #include <linux/idr.h> 3904c52decSPablo Neira Ayuso #include <linux/skbuff.h> 40a30c7b42SJiri Pirko #include <linux/notifier.h> 41a0a53c8bSDenis V. Lunev 42038e7332SEric W. Biederman struct user_namespace; 43457c4cbcSEric W. Biederman struct proc_dir_entry; 442774c7abSEric W. Biederman struct net_device; 4597c53cacSDenis V. Lunev struct sock; 461597fbc0SPavel Emelyanov struct ctl_table_header; 47dec827d1SPavel Emelyanov struct net_generic; 4894e5e308SChristian Brauner struct uevent_sock; 492553d064SJulian Anastasov struct netns_ipvs; 50d58e468bSPetar Penkov struct bpf_prog; 511597fbc0SPavel Emelyanov 527c28bd0bSEric Dumazet 537c28bd0bSEric Dumazet #define NETDEV_HASHBITS 8 547c28bd0bSEric Dumazet #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 557c28bd0bSEric Dumazet 565f256becSEric W. Biederman struct net { 572a06b898SEric Dumazet /* First cache line can be often dirtied. 582a06b898SEric Dumazet * Do not place here read-mostly fields. 592a06b898SEric Dumazet */ 60aad12c23SMike Rapoport refcount_t passive; /* To decide when the network 615f256becSEric W. Biederman * namespace should be freed. 625f256becSEric W. Biederman */ 638e602ce2SEric Dumazet spinlock_t rules_mod_lock; 648e602ce2SEric Dumazet 652a06b898SEric Dumazet unsigned int dev_unreg_count; 662a06b898SEric Dumazet 672a06b898SEric Dumazet unsigned int dev_base_seq; /* protected by rtnl_mutex */ 682a06b898SEric Dumazet int ifindex; 692a06b898SEric Dumazet 702a06b898SEric Dumazet spinlock_t nsid_lock; 712a06b898SEric Dumazet atomic_t fnhe_genid; 7233cf7c90SEric Dumazet 735f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 7419efbd93SKirill Tkhai struct list_head exit_list; /* To linked to call pernet exit 754420bf21SKirill Tkhai * methods on dead net ( 764420bf21SKirill Tkhai * pernet_ops_rwsem read locked), 774420bf21SKirill Tkhai * or to unregister pernet ops 784420bf21SKirill Tkhai * (pernet_ops_rwsem write locked). 7919efbd93SKirill Tkhai */ 8065b7b5b9SKirill Tkhai struct llist_node cleanup_list; /* namespaces on death row */ 8165b7b5b9SKirill Tkhai 829b242610SDavid Howells #ifdef CONFIG_KEYS 839b242610SDavid Howells struct key_tag *key_domain; /* Key domain of operation tag */ 849b242610SDavid Howells #endif 85038e7332SEric W. Biederman struct user_namespace *user_ns; /* Owning user namespace */ 8670328660SEric W. Biederman struct ucounts *ucounts; 870c7aecd4SNicolas Dichtel struct idr netns_ids; 88038e7332SEric W. Biederman 89435d5f4bSAl Viro struct ns_common ns; 9098f842e6SEric W. Biederman 912a06b898SEric Dumazet struct list_head dev_base_head; 92457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 93457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 94881d966bSEric W. Biederman 9573455092SAl Viro #ifdef CONFIG_SYSCTL 9673455092SAl Viro struct ctl_table_set sysctls; 9773455092SAl Viro #endif 9895bdfccbSEric W. Biederman 998e602ce2SEric Dumazet struct sock *rtnl; /* rtnetlink socket */ 1008e602ce2SEric Dumazet struct sock *genl_sock; 1012774c7abSEric W. Biederman 10294e5e308SChristian Brauner struct uevent_sock *uevent_sock; /* uevent socket */ 10394e5e308SChristian Brauner 104881d966bSEric W. Biederman struct hlist_head *dev_name_head; 105881d966bSEric W. Biederman struct hlist_head *dev_index_head; 106a30c7b42SJiri Pirko struct raw_notifier_head netdev_chain; 107a30c7b42SJiri Pirko 1082a06b898SEric Dumazet /* Note that @hash_mix can be read millions times per second, 1092a06b898SEric Dumazet * it is critical that it is on a read_mostly cache line. 1102a06b898SEric Dumazet */ 1112a06b898SEric Dumazet u32 hash_mix; 1122a06b898SEric Dumazet 1132a06b898SEric Dumazet struct net_device *loopback_dev; /* The loopback */ 11497c53cacSDenis V. Lunev 1155fd30ee7SDenis V. Lunev /* core fib_rules */ 1165fd30ee7SDenis V. Lunev struct list_head rules_ops; 1175fd30ee7SDenis V. Lunev 1188efa6e93SPavel Emelyanov struct netns_core core; 119852566f5SPavel Emelyanov struct netns_mib mib; 1202aaef4e4SDenis V. Lunev struct netns_packet packet; 121a0a53c8bSDenis V. Lunev struct netns_unix unx; 122ab84be7eSDavid Ahern struct netns_nexthop nexthop; 1238afd351cSPavel Emelyanov struct netns_ipv4 ipv4; 124dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 125b0f159dbSDaniel Lezcano struct netns_ipv6 ipv6; 126b0f159dbSDaniel Lezcano #endif 127633fc86fSAlexander Aring #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 128633fc86fSAlexander Aring struct netns_ieee802154_lowpan ieee802154_lowpan; 129633fc86fSAlexander Aring #endif 1304db67e80SEric W. Biederman #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 1314db67e80SEric W. Biederman struct netns_sctp sctp; 1324db67e80SEric W. Biederman #endif 1338d870052SAlexey Dobriyan #ifdef CONFIG_NETFILTER 134f3c1a44aSGao feng struct netns_nf nf; 1358d870052SAlexey Dobriyan struct netns_xt xt; 136dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 137dfdb8d79SAlexey Dobriyan struct netns_ct ct; 138dfdb8d79SAlexey Dobriyan #endif 13999633ab2SPablo Neira Ayuso #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 14099633ab2SPablo Neira Ayuso struct netns_nftables nft; 14199633ab2SPablo Neira Ayuso #endif 1428d870052SAlexey Dobriyan #endif 1433d23e349SJohannes Berg #ifdef CONFIG_WEXT_CORE 144b333b3d2SJohannes Berg struct sk_buff_head wext_nlevents; 145b333b3d2SJohannes Berg #endif 1461c87733dSEric Dumazet struct net_generic __rcu *gen; 1478e602ce2SEric Dumazet 148a3fd7ceeSJakub Sitnicki /* Used to store attached BPF programs */ 149a3fd7ceeSJakub Sitnicki struct netns_bpf bpf; 150d58e468bSPetar Penkov 1518e602ce2SEric Dumazet /* Note : following structs are cache line aligned */ 1528e602ce2SEric Dumazet #ifdef CONFIG_XFRM 1538e602ce2SEric Dumazet struct netns_xfrm xfrm; 1548e602ce2SEric Dumazet #endif 155f318903cSDaniel Borkmann 1563d368ab8SEric Dumazet u64 net_cookie; /* written once */ 157f318903cSDaniel Borkmann 1588b4d14d8SJunweiZhang #if IS_ENABLED(CONFIG_IP_VS) 15961b1ab45SHans Schillstrom struct netns_ipvs *ipvs; 1608b4d14d8SJunweiZhang #endif 1610189197fSEric W. Biederman #if IS_ENABLED(CONFIG_MPLS) 1620189197fSEric W. Biederman struct netns_mpls mpls; 1630189197fSEric W. Biederman #endif 1648e8cda6dSMario Kicherer #if IS_ENABLED(CONFIG_CAN) 1658e8cda6dSMario Kicherer struct netns_can can; 1668e8cda6dSMario Kicherer #endif 1671d0dc069SBjörn Töpel #ifdef CONFIG_XDP_SOCKETS 1681d0dc069SBjörn Töpel struct netns_xdp xdp; 1691d0dc069SBjörn Töpel #endif 17091b05a7eSOndrej Mosnacek #if IS_ENABLED(CONFIG_CRYPTO_USER) 17191b05a7eSOndrej Mosnacek struct sock *crypto_nlsk; 17291b05a7eSOndrej Mosnacek #endif 17351d7cccfSAndrey Vagin struct sock *diag_nlsk; 174*194730a9SGuvenc Gulce #if IS_ENABLED(CONFIG_SMC) 175*194730a9SGuvenc Gulce struct netns_smc smc; 176*194730a9SGuvenc Gulce #endif 1773859a271SKees Cook } __randomize_layout; 1785f256becSEric W. Biederman 179c0f39322SDenis V. Lunev #include <linux/seq_file_net.h> 180c0f39322SDenis V. Lunev 1814fabcd71SDaniel Lezcano /* Init's network namespace */ 1825f256becSEric W. Biederman extern struct net init_net; 183a4aa834aSDenis V. Lunev 184d727abcbSEric W. Biederman #ifdef CONFIG_NET_NS 185e67e16eaSJoe Perches struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 186e67e16eaSJoe Perches struct net *old_net); 187225c0a01SDenis V. Lunev 188fbdeaed4STyler Hicks void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid); 189fbdeaed4STyler Hicks 1907866cc57SFlorian Westphal void net_ns_barrier(void); 191d727abcbSEric W. Biederman #else /* CONFIG_NET_NS */ 192d727abcbSEric W. Biederman #include <linux/sched.h> 193d727abcbSEric W. Biederman #include <linux/nsproxy.h> 194038e7332SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, 195038e7332SEric W. Biederman struct user_namespace *user_ns, struct net *old_net) 1969dd776b6SEric W. Biederman { 197d727abcbSEric W. Biederman if (flags & CLONE_NEWNET) 198d727abcbSEric W. Biederman return ERR_PTR(-EINVAL); 199d727abcbSEric W. Biederman return old_net; 2009dd776b6SEric W. Biederman } 2017866cc57SFlorian Westphal 202fbdeaed4STyler Hicks static inline void net_ns_get_ownership(const struct net *net, 203fbdeaed4STyler Hicks kuid_t *uid, kgid_t *gid) 204fbdeaed4STyler Hicks { 205fbdeaed4STyler Hicks *uid = GLOBAL_ROOT_UID; 206fbdeaed4STyler Hicks *gid = GLOBAL_ROOT_GID; 207fbdeaed4STyler Hicks } 208fbdeaed4STyler Hicks 2097866cc57SFlorian Westphal static inline void net_ns_barrier(void) {} 210d727abcbSEric W. Biederman #endif /* CONFIG_NET_NS */ 211225c0a01SDenis V. Lunev 212225c0a01SDenis V. Lunev 213225c0a01SDenis V. Lunev extern struct list_head net_namespace_list; 2149dd776b6SEric W. Biederman 215e67e16eaSJoe Perches struct net *get_net_ns_by_pid(pid_t pid); 2160f5258cdSStefan Hajnoczi struct net *get_net_ns_by_fd(int fd); 21730ffee84SJohannes Berg 218535d3ae9SRashika Kheria #ifdef CONFIG_SYSCTL 219535d3ae9SRashika Kheria void ipx_register_sysctl(void); 220535d3ae9SRashika Kheria void ipx_unregister_sysctl(void); 221535d3ae9SRashika Kheria #else 222535d3ae9SRashika Kheria #define ipx_register_sysctl() 223535d3ae9SRashika Kheria #define ipx_unregister_sysctl() 224535d3ae9SRashika Kheria #endif 225535d3ae9SRashika Kheria 226d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 227e67e16eaSJoe Perches void __put_net(struct net *net); 2285f256becSEric W. Biederman 2295f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 2305f256becSEric W. Biederman { 2318b8f3e66SChristian Brauner refcount_inc(&net->ns.count); 2325f256becSEric W. Biederman return net; 2335f256becSEric W. Biederman } 2345f256becSEric W. Biederman 235077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 236077130c0SEric W. Biederman { 237077130c0SEric W. Biederman /* Used when we know struct net exists but we 238077130c0SEric W. Biederman * aren't guaranteed a previous reference count 239077130c0SEric W. Biederman * exists. If the reference count is zero this 240077130c0SEric W. Biederman * function fails and returns NULL. 241077130c0SEric W. Biederman */ 2428b8f3e66SChristian Brauner if (!refcount_inc_not_zero(&net->ns.count)) 243077130c0SEric W. Biederman net = NULL; 244077130c0SEric W. Biederman return net; 245077130c0SEric W. Biederman } 246077130c0SEric W. Biederman 2475f256becSEric W. Biederman static inline void put_net(struct net *net) 2485f256becSEric W. Biederman { 2498b8f3e66SChristian Brauner if (refcount_dec_and_test(&net->ns.count)) 2505f256becSEric W. Biederman __put_net(net); 2515f256becSEric W. Biederman } 2525f256becSEric W. Biederman 253878628fbSYOSHIFUJI Hideaki static inline 254878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 255878628fbSYOSHIFUJI Hideaki { 256878628fbSYOSHIFUJI Hideaki return net1 == net2; 257878628fbSYOSHIFUJI Hideaki } 258a685e089SAl Viro 2594ee806d5SDan Streetman static inline int check_net(const struct net *net) 2604ee806d5SDan Streetman { 2618b8f3e66SChristian Brauner return refcount_read(&net->ns.count) != 0; 2624ee806d5SDan Streetman } 2634ee806d5SDan Streetman 264e67e16eaSJoe Perches void net_drop_ns(void *); 265a685e089SAl Viro 266d4655795SPavel Emelyanov #else 267b9f75f45SEric W. Biederman 268d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 269d4655795SPavel Emelyanov { 270d4655795SPavel Emelyanov return net; 271d4655795SPavel Emelyanov } 272d4655795SPavel Emelyanov 273d4655795SPavel Emelyanov static inline void put_net(struct net *net) 274d4655795SPavel Emelyanov { 275d4655795SPavel Emelyanov } 276d4655795SPavel Emelyanov 277d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 278d4655795SPavel Emelyanov { 279d4655795SPavel Emelyanov return net; 280d4655795SPavel Emelyanov } 281878628fbSYOSHIFUJI Hideaki 282878628fbSYOSHIFUJI Hideaki static inline 283878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 284878628fbSYOSHIFUJI Hideaki { 285878628fbSYOSHIFUJI Hideaki return 1; 286878628fbSYOSHIFUJI Hideaki } 287a685e089SAl Viro 2884ee806d5SDan Streetman static inline int check_net(const struct net *net) 2894ee806d5SDan Streetman { 2904ee806d5SDan Streetman return 1; 2914ee806d5SDan Streetman } 2924ee806d5SDan Streetman 293a685e089SAl Viro #define net_drop_ns NULL 294d4655795SPavel Emelyanov #endif 2955f256becSEric W. Biederman 2965d1e4468SDenis V. Lunev 2970c5c9fb5SEric W. Biederman typedef struct { 2988f424b5fSEric Dumazet #ifdef CONFIG_NET_NS 2990c5c9fb5SEric W. Biederman struct net *net; 3008f424b5fSEric Dumazet #endif 3010c5c9fb5SEric W. Biederman } possible_net_t; 3020c5c9fb5SEric W. Biederman 3030c5c9fb5SEric W. Biederman static inline void write_pnet(possible_net_t *pnet, struct net *net) 3040c5c9fb5SEric W. Biederman { 3050c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 3060c5c9fb5SEric W. Biederman pnet->net = net; 3070c5c9fb5SEric W. Biederman #endif 3080c5c9fb5SEric W. Biederman } 3090c5c9fb5SEric W. Biederman 3100c5c9fb5SEric W. Biederman static inline struct net *read_pnet(const possible_net_t *pnet) 3110c5c9fb5SEric W. Biederman { 3120c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 3130c5c9fb5SEric W. Biederman return pnet->net; 3140c5c9fb5SEric W. Biederman #else 3150c5c9fb5SEric W. Biederman return &init_net; 3160c5c9fb5SEric W. Biederman #endif 3170c5c9fb5SEric W. Biederman } 3185d1e4468SDenis V. Lunev 319f0b07bb1SKirill Tkhai /* Protected by net_rwsem */ 3205f256becSEric W. Biederman #define for_each_net(VAR) \ 3215f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 322afa0df59SJiri Pirko #define for_each_net_continue_reverse(VAR) \ 323afa0df59SJiri Pirko list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list) 32411a28d37SJohannes Berg #define for_each_net_rcu(VAR) \ 32511a28d37SJohannes Berg list_for_each_entry_rcu(VAR, &net_namespace_list, list) 32611a28d37SJohannes Berg 3274665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 3284665079cSPavel Emelyanov #define __net_init 3294665079cSPavel Emelyanov #define __net_exit 330022cbae6SDenis V. Lunev #define __net_initdata 33104a6f82cSAndi Kleen #define __net_initconst 3324665079cSPavel Emelyanov #else 3334665079cSPavel Emelyanov #define __net_init __init 334bd721ea7SFabian Frederick #define __net_exit __ref 335022cbae6SDenis V. Lunev #define __net_initdata __initdata 33604a6f82cSAndi Kleen #define __net_initconst __initconst 3374665079cSPavel Emelyanov #endif 3385f256becSEric W. Biederman 339d4e4fdf9SGuillaume Nault int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp); 34056f200c7SGuillaume Nault int peernet2id(const struct net *net, struct net *peer); 34156f200c7SGuillaume Nault bool peernet_has_id(const struct net *net, struct net *peer); 34256f200c7SGuillaume Nault struct net *get_net_ns_by_id(const struct net *net, int id); 3430c7aecd4SNicolas Dichtel 3445f256becSEric W. Biederman struct pernet_operations { 3455f256becSEric W. Biederman struct list_head list; 3466056415dSKirill Tkhai /* 3476056415dSKirill Tkhai * Below methods are called without any exclusive locks. 3486056415dSKirill Tkhai * More than one net may be constructed and destructed 3496056415dSKirill Tkhai * in parallel on several cpus. Every pernet_operations 3506056415dSKirill Tkhai * have to keep in mind all other pernet_operations and 3516056415dSKirill Tkhai * to introduce a locking, if they share common resources. 3526056415dSKirill Tkhai * 3538518e9bbSKirill Tkhai * The only time they are called with exclusive lock is 3548518e9bbSKirill Tkhai * from register_pernet_subsys(), unregister_pernet_subsys() 3558518e9bbSKirill Tkhai * register_pernet_device() and unregister_pernet_device(). 3568518e9bbSKirill Tkhai * 3576056415dSKirill Tkhai * Exit methods using blocking RCU primitives, such as 3586056415dSKirill Tkhai * synchronize_rcu(), should be implemented via exit_batch. 3596056415dSKirill Tkhai * Then, destruction of a group of net requires single 3606056415dSKirill Tkhai * synchronize_rcu() related to these pernet_operations, 3616056415dSKirill Tkhai * instead of separate synchronize_rcu() for every net. 3626056415dSKirill Tkhai * Please, avoid synchronize_rcu() at all, where it's possible. 363d7d99872SEric Dumazet * 364d7d99872SEric Dumazet * Note that a combination of pre_exit() and exit() can 365d7d99872SEric Dumazet * be used, since a synchronize_rcu() is guaranteed between 366d7d99872SEric Dumazet * the calls. 3676056415dSKirill Tkhai */ 3685f256becSEric W. Biederman int (*init)(struct net *net); 369d7d99872SEric Dumazet void (*pre_exit)(struct net *net); 3705f256becSEric W. Biederman void (*exit)(struct net *net); 37172ad937aSEric W. Biederman void (*exit_batch)(struct list_head *net_exit_list); 372c7d03a00SAlexey Dobriyan unsigned int *id; 373f875bae0SEric W. Biederman size_t size; 3745f256becSEric W. Biederman }; 3755f256becSEric W. Biederman 37617edde52SEric W. Biederman /* 37717edde52SEric W. Biederman * Use these carefully. If you implement a network device and it 37817edde52SEric W. Biederman * needs per network namespace operations use device pernet operations, 37917edde52SEric W. Biederman * otherwise use pernet subsys operations. 38017edde52SEric W. Biederman * 3814edf547bSJohannes Berg * Network interfaces need to be removed from a dying netns _before_ 3824edf547bSJohannes Berg * subsys notifiers can be called, as most of the network code cleanup 3834edf547bSJohannes Berg * (which is done from subsys notifiers) runs with the assumption that 3844edf547bSJohannes Berg * dev_remove_pack has been called so no new packets will arrive during 3854edf547bSJohannes Berg * and after the cleanup functions have been called. dev_remove_pack 3864edf547bSJohannes Berg * is not per namespace so instead the guarantee of no more packets 3874edf547bSJohannes Berg * arriving in a network namespace is provided by ensuring that all 3884edf547bSJohannes Berg * network devices and all sockets have left the network namespace 3894edf547bSJohannes Berg * before the cleanup methods are called. 39017edde52SEric W. Biederman * 39117edde52SEric W. Biederman * For the longest time the ipv4 icmp code was registered as a pernet 39217edde52SEric W. Biederman * device which caused kernel oops, and panics during network 39317edde52SEric W. Biederman * namespace cleanup. So please don't get this wrong. 39417edde52SEric W. Biederman */ 395e67e16eaSJoe Perches int register_pernet_subsys(struct pernet_operations *); 396e67e16eaSJoe Perches void unregister_pernet_subsys(struct pernet_operations *); 397e67e16eaSJoe Perches int register_pernet_device(struct pernet_operations *); 398e67e16eaSJoe Perches void unregister_pernet_device(struct pernet_operations *); 399f875bae0SEric W. Biederman 40095bdfccbSEric W. Biederman struct ctl_table; 401d62c612eSPavel Emelyanov 4022ca794e5SEric W. Biederman #ifdef CONFIG_SYSCTL 403e67e16eaSJoe Perches int net_sysctl_init(void); 404e67e16eaSJoe Perches struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 405e67e16eaSJoe Perches struct ctl_table *table); 406e67e16eaSJoe Perches void unregister_net_sysctl_table(struct ctl_table_header *header); 40748c74958SEric W. Biederman #else 40848c74958SEric W. Biederman static inline int net_sysctl_init(void) { return 0; } 40948c74958SEric W. Biederman static inline struct ctl_table_header *register_net_sysctl(struct net *net, 41048c74958SEric W. Biederman const char *path, struct ctl_table *table) 41148c74958SEric W. Biederman { 41248c74958SEric W. Biederman return NULL; 41348c74958SEric W. Biederman } 41448c74958SEric W. Biederman static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 41548c74958SEric W. Biederman { 41648c74958SEric W. Biederman } 41748c74958SEric W. Biederman #endif 41848c74958SEric W. Biederman 41956f200c7SGuillaume Nault static inline int rt_genid_ipv4(const struct net *net) 420b42664f8SNicolas Dichtel { 421ca4c3fc2Sfan.du return atomic_read(&net->ipv4.rt_genid); 422b42664f8SNicolas Dichtel } 423b42664f8SNicolas Dichtel 4248f34e53bSDavid Ahern #if IS_ENABLED(CONFIG_IPV6) 4258f34e53bSDavid Ahern static inline int rt_genid_ipv6(const struct net *net) 4268f34e53bSDavid Ahern { 4278f34e53bSDavid Ahern return atomic_read(&net->ipv6.fib6_sernum); 4288f34e53bSDavid Ahern } 4298f34e53bSDavid Ahern #endif 4308f34e53bSDavid Ahern 431ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv4(struct net *net) 432b42664f8SNicolas Dichtel { 433ca4c3fc2Sfan.du atomic_inc(&net->ipv4.rt_genid); 434ca4c3fc2Sfan.du } 435ca4c3fc2Sfan.du 436705f1c86SHannes Frederic Sowa extern void (*__fib6_flush_trees)(struct net *net); 437ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv6(struct net *net) 438ca4c3fc2Sfan.du { 439705f1c86SHannes Frederic Sowa if (__fib6_flush_trees) 440705f1c86SHannes Frederic Sowa __fib6_flush_trees(net); 441ca4c3fc2Sfan.du } 442ca4c3fc2Sfan.du 443599018a7SLuis R. Rodriguez #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 444599018a7SLuis R. Rodriguez static inline struct netns_ieee802154_lowpan * 445599018a7SLuis R. Rodriguez net_ieee802154_lowpan(struct net *net) 446599018a7SLuis R. Rodriguez { 447599018a7SLuis R. Rodriguez return &net->ieee802154_lowpan; 448599018a7SLuis R. Rodriguez } 449599018a7SLuis R. Rodriguez #endif 450599018a7SLuis R. Rodriguez 451ca4c3fc2Sfan.du /* For callers who don't really care about whether it's IPv4 or IPv6 */ 452ca4c3fc2Sfan.du static inline void rt_genid_bump_all(struct net *net) 453ca4c3fc2Sfan.du { 454ca4c3fc2Sfan.du rt_genid_bump_ipv4(net); 455ca4c3fc2Sfan.du rt_genid_bump_ipv6(net); 456b42664f8SNicolas Dichtel } 45795bdfccbSEric W. Biederman 45856f200c7SGuillaume Nault static inline int fnhe_genid(const struct net *net) 4595aad1de5STimo Teräs { 4605aad1de5STimo Teräs return atomic_read(&net->fnhe_genid); 4615aad1de5STimo Teräs } 4625aad1de5STimo Teräs 4635aad1de5STimo Teräs static inline void fnhe_genid_bump(struct net *net) 4645aad1de5STimo Teräs { 4655aad1de5STimo Teräs atomic_inc(&net->fnhe_genid); 4665aad1de5STimo Teräs } 4675aad1de5STimo Teräs 4685f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 469