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> 26dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 27dfdb8d79SAlexey Dobriyan #include <net/netns/conntrack.h> 28dfdb8d79SAlexey Dobriyan #endif 29*b0381776SVlad Buslov #if IS_ENABLED(CONFIG_NF_FLOW_TABLE) 30*b0381776SVlad Buslov #include <net/netns/flow_table.h> 31*b0381776SVlad Buslov #endif 3299633ab2SPablo Neira Ayuso #include <net/netns/nftables.h> 33d62ddc21SAlexey Dobriyan #include <net/netns/xfrm.h> 340189197fSEric W. Biederman #include <net/netns/mpls.h> 358e8cda6dSMario Kicherer #include <net/netns/can.h> 361d0dc069SBjörn Töpel #include <net/netns/xdp.h> 37194730a9SGuvenc Gulce #include <net/netns/smc.h> 38a3fd7ceeSJakub Sitnicki #include <net/netns/bpf.h> 39889b7da2SJeremy Kerr #include <net/netns/mctp.h> 409ba74e6cSEric Dumazet #include <net/net_trackers.h> 41435d5f4bSAl Viro #include <linux/ns_common.h> 4204c52decSPablo Neira Ayuso #include <linux/idr.h> 4304c52decSPablo Neira Ayuso #include <linux/skbuff.h> 44a30c7b42SJiri Pirko #include <linux/notifier.h> 45a0a53c8bSDenis V. Lunev 46038e7332SEric W. Biederman struct user_namespace; 47457c4cbcSEric W. Biederman struct proc_dir_entry; 482774c7abSEric W. Biederman struct net_device; 4997c53cacSDenis V. Lunev struct sock; 501597fbc0SPavel Emelyanov struct ctl_table_header; 51dec827d1SPavel Emelyanov struct net_generic; 5294e5e308SChristian Brauner struct uevent_sock; 532553d064SJulian Anastasov struct netns_ipvs; 54d58e468bSPetar Penkov struct bpf_prog; 551597fbc0SPavel Emelyanov 567c28bd0bSEric Dumazet 577c28bd0bSEric Dumazet #define NETDEV_HASHBITS 8 587c28bd0bSEric Dumazet #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 597c28bd0bSEric Dumazet 605f256becSEric W. Biederman struct net { 612a06b898SEric Dumazet /* First cache line can be often dirtied. 622a06b898SEric Dumazet * Do not place here read-mostly fields. 632a06b898SEric Dumazet */ 64aad12c23SMike Rapoport refcount_t passive; /* To decide when the network 655f256becSEric W. Biederman * namespace should be freed. 665f256becSEric W. Biederman */ 678e602ce2SEric Dumazet spinlock_t rules_mod_lock; 688e602ce2SEric Dumazet 69ede6c39cSEric Dumazet atomic_t dev_unreg_count; 702a06b898SEric Dumazet 712a06b898SEric Dumazet unsigned int dev_base_seq; /* protected by rtnl_mutex */ 722a06b898SEric Dumazet int ifindex; 732a06b898SEric Dumazet 742a06b898SEric Dumazet spinlock_t nsid_lock; 752a06b898SEric Dumazet atomic_t fnhe_genid; 7633cf7c90SEric Dumazet 775f256becSEric W. Biederman struct list_head list; /* list of network namespaces */ 7819efbd93SKirill Tkhai struct list_head exit_list; /* To linked to call pernet exit 794420bf21SKirill Tkhai * methods on dead net ( 804420bf21SKirill Tkhai * pernet_ops_rwsem read locked), 814420bf21SKirill Tkhai * or to unregister pernet ops 824420bf21SKirill Tkhai * (pernet_ops_rwsem write locked). 8319efbd93SKirill Tkhai */ 8465b7b5b9SKirill Tkhai struct llist_node cleanup_list; /* namespaces on death row */ 8565b7b5b9SKirill Tkhai 869b242610SDavid Howells #ifdef CONFIG_KEYS 879b242610SDavid Howells struct key_tag *key_domain; /* Key domain of operation tag */ 889b242610SDavid Howells #endif 89038e7332SEric W. Biederman struct user_namespace *user_ns; /* Owning user namespace */ 9070328660SEric W. Biederman struct ucounts *ucounts; 910c7aecd4SNicolas Dichtel struct idr netns_ids; 92038e7332SEric W. Biederman 93435d5f4bSAl Viro struct ns_common ns; 949ba74e6cSEric Dumazet struct ref_tracker_dir refcnt_tracker; 9598f842e6SEric W. Biederman 962a06b898SEric Dumazet struct list_head dev_base_head; 97457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net; 98457c4cbcSEric W. Biederman struct proc_dir_entry *proc_net_stat; 99881d966bSEric W. Biederman 10073455092SAl Viro #ifdef CONFIG_SYSCTL 10173455092SAl Viro struct ctl_table_set sysctls; 10273455092SAl Viro #endif 10395bdfccbSEric W. Biederman 1048e602ce2SEric Dumazet struct sock *rtnl; /* rtnetlink socket */ 1058e602ce2SEric Dumazet struct sock *genl_sock; 1062774c7abSEric W. Biederman 10794e5e308SChristian Brauner struct uevent_sock *uevent_sock; /* uevent socket */ 10894e5e308SChristian Brauner 109881d966bSEric W. Biederman struct hlist_head *dev_name_head; 110881d966bSEric W. Biederman struct hlist_head *dev_index_head; 111a30c7b42SJiri Pirko struct raw_notifier_head netdev_chain; 112a30c7b42SJiri Pirko 1132a06b898SEric Dumazet /* Note that @hash_mix can be read millions times per second, 1142a06b898SEric Dumazet * it is critical that it is on a read_mostly cache line. 1152a06b898SEric Dumazet */ 1162a06b898SEric Dumazet u32 hash_mix; 1172a06b898SEric Dumazet 1182a06b898SEric Dumazet struct net_device *loopback_dev; /* The loopback */ 11997c53cacSDenis V. Lunev 1205fd30ee7SDenis V. Lunev /* core fib_rules */ 1215fd30ee7SDenis V. Lunev struct list_head rules_ops; 1225fd30ee7SDenis V. Lunev 1238efa6e93SPavel Emelyanov struct netns_core core; 124852566f5SPavel Emelyanov struct netns_mib mib; 1252aaef4e4SDenis V. Lunev struct netns_packet packet; 126b6e81138SKuniyuki Iwashima #if IS_ENABLED(CONFIG_UNIX) 127a0a53c8bSDenis V. Lunev struct netns_unix unx; 128b6e81138SKuniyuki Iwashima #endif 129ab84be7eSDavid Ahern struct netns_nexthop nexthop; 1308afd351cSPavel Emelyanov struct netns_ipv4 ipv4; 131dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 132b0f159dbSDaniel Lezcano struct netns_ipv6 ipv6; 133b0f159dbSDaniel Lezcano #endif 134633fc86fSAlexander Aring #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 135633fc86fSAlexander Aring struct netns_ieee802154_lowpan ieee802154_lowpan; 136633fc86fSAlexander Aring #endif 1374db67e80SEric W. Biederman #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 1384db67e80SEric W. Biederman struct netns_sctp sctp; 1394db67e80SEric W. Biederman #endif 1408d870052SAlexey Dobriyan #ifdef CONFIG_NETFILTER 141f3c1a44aSGao feng struct netns_nf nf; 142dfdb8d79SAlexey Dobriyan #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 143dfdb8d79SAlexey Dobriyan struct netns_ct ct; 144dfdb8d79SAlexey Dobriyan #endif 14599633ab2SPablo Neira Ayuso #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 14699633ab2SPablo Neira Ayuso struct netns_nftables nft; 14799633ab2SPablo Neira Ayuso #endif 148*b0381776SVlad Buslov #if IS_ENABLED(CONFIG_NF_FLOW_TABLE) 149*b0381776SVlad Buslov struct netns_ft ft; 150*b0381776SVlad Buslov #endif 1518d870052SAlexey Dobriyan #endif 1523d23e349SJohannes Berg #ifdef CONFIG_WEXT_CORE 153b333b3d2SJohannes Berg struct sk_buff_head wext_nlevents; 154b333b3d2SJohannes Berg #endif 1551c87733dSEric Dumazet struct net_generic __rcu *gen; 1568e602ce2SEric Dumazet 157a3fd7ceeSJakub Sitnicki /* Used to store attached BPF programs */ 158a3fd7ceeSJakub Sitnicki struct netns_bpf bpf; 159d58e468bSPetar Penkov 1608e602ce2SEric Dumazet /* Note : following structs are cache line aligned */ 1618e602ce2SEric Dumazet #ifdef CONFIG_XFRM 1628e602ce2SEric Dumazet struct netns_xfrm xfrm; 1638e602ce2SEric Dumazet #endif 164f318903cSDaniel Borkmann 1653d368ab8SEric Dumazet u64 net_cookie; /* written once */ 166f318903cSDaniel Borkmann 1678b4d14d8SJunweiZhang #if IS_ENABLED(CONFIG_IP_VS) 16861b1ab45SHans Schillstrom struct netns_ipvs *ipvs; 1698b4d14d8SJunweiZhang #endif 1700189197fSEric W. Biederman #if IS_ENABLED(CONFIG_MPLS) 1710189197fSEric W. Biederman struct netns_mpls mpls; 1720189197fSEric W. Biederman #endif 1738e8cda6dSMario Kicherer #if IS_ENABLED(CONFIG_CAN) 1748e8cda6dSMario Kicherer struct netns_can can; 1758e8cda6dSMario Kicherer #endif 1761d0dc069SBjörn Töpel #ifdef CONFIG_XDP_SOCKETS 1771d0dc069SBjörn Töpel struct netns_xdp xdp; 1781d0dc069SBjörn Töpel #endif 179889b7da2SJeremy Kerr #if IS_ENABLED(CONFIG_MCTP) 180889b7da2SJeremy Kerr struct netns_mctp mctp; 181889b7da2SJeremy Kerr #endif 18291b05a7eSOndrej Mosnacek #if IS_ENABLED(CONFIG_CRYPTO_USER) 18391b05a7eSOndrej Mosnacek struct sock *crypto_nlsk; 18491b05a7eSOndrej Mosnacek #endif 18551d7cccfSAndrey Vagin struct sock *diag_nlsk; 186194730a9SGuvenc Gulce #if IS_ENABLED(CONFIG_SMC) 187194730a9SGuvenc Gulce struct netns_smc smc; 188194730a9SGuvenc Gulce #endif 1893859a271SKees Cook } __randomize_layout; 1905f256becSEric W. Biederman 191c0f39322SDenis V. Lunev #include <linux/seq_file_net.h> 192c0f39322SDenis V. Lunev 1934fabcd71SDaniel Lezcano /* Init's network namespace */ 1945f256becSEric W. Biederman extern struct net init_net; 195a4aa834aSDenis V. Lunev 196d727abcbSEric W. Biederman #ifdef CONFIG_NET_NS 197e67e16eaSJoe Perches struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 198e67e16eaSJoe Perches struct net *old_net); 199225c0a01SDenis V. Lunev 200fbdeaed4STyler Hicks void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid); 201fbdeaed4STyler Hicks 2027866cc57SFlorian Westphal void net_ns_barrier(void); 203ea6932d7SChangbin Du 204ea6932d7SChangbin Du struct ns_common *get_net_ns(struct ns_common *ns); 205e34492deSChangbin Du struct net *get_net_ns_by_fd(int fd); 206d727abcbSEric W. Biederman #else /* CONFIG_NET_NS */ 207d727abcbSEric W. Biederman #include <linux/sched.h> 208d727abcbSEric W. Biederman #include <linux/nsproxy.h> 209038e7332SEric W. Biederman static inline struct net *copy_net_ns(unsigned long flags, 210038e7332SEric W. Biederman struct user_namespace *user_ns, struct net *old_net) 2119dd776b6SEric W. Biederman { 212d727abcbSEric W. Biederman if (flags & CLONE_NEWNET) 213d727abcbSEric W. Biederman return ERR_PTR(-EINVAL); 214d727abcbSEric W. Biederman return old_net; 2159dd776b6SEric W. Biederman } 2167866cc57SFlorian Westphal 217fbdeaed4STyler Hicks static inline void net_ns_get_ownership(const struct net *net, 218fbdeaed4STyler Hicks kuid_t *uid, kgid_t *gid) 219fbdeaed4STyler Hicks { 220fbdeaed4STyler Hicks *uid = GLOBAL_ROOT_UID; 221fbdeaed4STyler Hicks *gid = GLOBAL_ROOT_GID; 222fbdeaed4STyler Hicks } 223fbdeaed4STyler Hicks 2247866cc57SFlorian Westphal static inline void net_ns_barrier(void) {} 225ea6932d7SChangbin Du 226ea6932d7SChangbin Du static inline struct ns_common *get_net_ns(struct ns_common *ns) 227ea6932d7SChangbin Du { 228ea6932d7SChangbin Du return ERR_PTR(-EINVAL); 229ea6932d7SChangbin Du } 230e34492deSChangbin Du 231e34492deSChangbin Du static inline struct net *get_net_ns_by_fd(int fd) 232e34492deSChangbin Du { 233e34492deSChangbin Du return ERR_PTR(-EINVAL); 234e34492deSChangbin Du } 235d727abcbSEric W. Biederman #endif /* CONFIG_NET_NS */ 236225c0a01SDenis V. Lunev 237225c0a01SDenis V. Lunev 238225c0a01SDenis V. Lunev extern struct list_head net_namespace_list; 2399dd776b6SEric W. Biederman 240e67e16eaSJoe Perches struct net *get_net_ns_by_pid(pid_t pid); 24130ffee84SJohannes Berg 242535d3ae9SRashika Kheria #ifdef CONFIG_SYSCTL 243535d3ae9SRashika Kheria void ipx_register_sysctl(void); 244535d3ae9SRashika Kheria void ipx_unregister_sysctl(void); 245535d3ae9SRashika Kheria #else 246535d3ae9SRashika Kheria #define ipx_register_sysctl() 247535d3ae9SRashika Kheria #define ipx_unregister_sysctl() 248535d3ae9SRashika Kheria #endif 249535d3ae9SRashika Kheria 250d4655795SPavel Emelyanov #ifdef CONFIG_NET_NS 251e67e16eaSJoe Perches void __put_net(struct net *net); 2525f256becSEric W. Biederman 2539ba74e6cSEric Dumazet /* Try using get_net_track() instead */ 2545f256becSEric W. Biederman static inline struct net *get_net(struct net *net) 2555f256becSEric W. Biederman { 2568b8f3e66SChristian Brauner refcount_inc(&net->ns.count); 2575f256becSEric W. Biederman return net; 2585f256becSEric W. Biederman } 2595f256becSEric W. Biederman 260077130c0SEric W. Biederman static inline struct net *maybe_get_net(struct net *net) 261077130c0SEric W. Biederman { 262077130c0SEric W. Biederman /* Used when we know struct net exists but we 263077130c0SEric W. Biederman * aren't guaranteed a previous reference count 264077130c0SEric W. Biederman * exists. If the reference count is zero this 265077130c0SEric W. Biederman * function fails and returns NULL. 266077130c0SEric W. Biederman */ 2678b8f3e66SChristian Brauner if (!refcount_inc_not_zero(&net->ns.count)) 268077130c0SEric W. Biederman net = NULL; 269077130c0SEric W. Biederman return net; 270077130c0SEric W. Biederman } 271077130c0SEric W. Biederman 2729ba74e6cSEric Dumazet /* Try using put_net_track() instead */ 2735f256becSEric W. Biederman static inline void put_net(struct net *net) 2745f256becSEric W. Biederman { 2758b8f3e66SChristian Brauner if (refcount_dec_and_test(&net->ns.count)) 2765f256becSEric W. Biederman __put_net(net); 2775f256becSEric W. Biederman } 2785f256becSEric W. Biederman 279878628fbSYOSHIFUJI Hideaki static inline 280878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 281878628fbSYOSHIFUJI Hideaki { 282878628fbSYOSHIFUJI Hideaki return net1 == net2; 283878628fbSYOSHIFUJI Hideaki } 284a685e089SAl Viro 2854ee806d5SDan Streetman static inline int check_net(const struct net *net) 2864ee806d5SDan Streetman { 2878b8f3e66SChristian Brauner return refcount_read(&net->ns.count) != 0; 2884ee806d5SDan Streetman } 2894ee806d5SDan Streetman 290e67e16eaSJoe Perches void net_drop_ns(void *); 291a685e089SAl Viro 292d4655795SPavel Emelyanov #else 293b9f75f45SEric W. Biederman 294d4655795SPavel Emelyanov static inline struct net *get_net(struct net *net) 295d4655795SPavel Emelyanov { 296d4655795SPavel Emelyanov return net; 297d4655795SPavel Emelyanov } 298d4655795SPavel Emelyanov 299d4655795SPavel Emelyanov static inline void put_net(struct net *net) 300d4655795SPavel Emelyanov { 301d4655795SPavel Emelyanov } 302d4655795SPavel Emelyanov 303d4655795SPavel Emelyanov static inline struct net *maybe_get_net(struct net *net) 304d4655795SPavel Emelyanov { 305d4655795SPavel Emelyanov return net; 306d4655795SPavel Emelyanov } 307878628fbSYOSHIFUJI Hideaki 308878628fbSYOSHIFUJI Hideaki static inline 309878628fbSYOSHIFUJI Hideaki int net_eq(const struct net *net1, const struct net *net2) 310878628fbSYOSHIFUJI Hideaki { 311878628fbSYOSHIFUJI Hideaki return 1; 312878628fbSYOSHIFUJI Hideaki } 313a685e089SAl Viro 3144ee806d5SDan Streetman static inline int check_net(const struct net *net) 3154ee806d5SDan Streetman { 3164ee806d5SDan Streetman return 1; 3174ee806d5SDan Streetman } 3184ee806d5SDan Streetman 319a685e089SAl Viro #define net_drop_ns NULL 320d4655795SPavel Emelyanov #endif 3215f256becSEric W. Biederman 3225d1e4468SDenis V. Lunev 3239ba74e6cSEric Dumazet static inline void netns_tracker_alloc(struct net *net, 3249ba74e6cSEric Dumazet netns_tracker *tracker, gfp_t gfp) 3259ba74e6cSEric Dumazet { 3269ba74e6cSEric Dumazet #ifdef CONFIG_NET_NS_REFCNT_TRACKER 3279ba74e6cSEric Dumazet ref_tracker_alloc(&net->refcnt_tracker, tracker, gfp); 3289ba74e6cSEric Dumazet #endif 3299ba74e6cSEric Dumazet } 3309ba74e6cSEric Dumazet 3319ba74e6cSEric Dumazet static inline void netns_tracker_free(struct net *net, 3329ba74e6cSEric Dumazet netns_tracker *tracker) 3339ba74e6cSEric Dumazet { 3349ba74e6cSEric Dumazet #ifdef CONFIG_NET_NS_REFCNT_TRACKER 3359ba74e6cSEric Dumazet ref_tracker_free(&net->refcnt_tracker, tracker); 3369ba74e6cSEric Dumazet #endif 3379ba74e6cSEric Dumazet } 3389ba74e6cSEric Dumazet 3399ba74e6cSEric Dumazet static inline struct net *get_net_track(struct net *net, 3409ba74e6cSEric Dumazet netns_tracker *tracker, gfp_t gfp) 3419ba74e6cSEric Dumazet { 3429ba74e6cSEric Dumazet get_net(net); 3439ba74e6cSEric Dumazet netns_tracker_alloc(net, tracker, gfp); 3449ba74e6cSEric Dumazet return net; 3459ba74e6cSEric Dumazet } 3469ba74e6cSEric Dumazet 3479ba74e6cSEric Dumazet static inline void put_net_track(struct net *net, netns_tracker *tracker) 3489ba74e6cSEric Dumazet { 3499ba74e6cSEric Dumazet netns_tracker_free(net, tracker); 3509ba74e6cSEric Dumazet put_net(net); 3519ba74e6cSEric Dumazet } 3529ba74e6cSEric Dumazet 3530c5c9fb5SEric W. Biederman typedef struct { 3548f424b5fSEric Dumazet #ifdef CONFIG_NET_NS 3550c5c9fb5SEric W. Biederman struct net *net; 3568f424b5fSEric Dumazet #endif 3570c5c9fb5SEric W. Biederman } possible_net_t; 3580c5c9fb5SEric W. Biederman 3590c5c9fb5SEric W. Biederman static inline void write_pnet(possible_net_t *pnet, struct net *net) 3600c5c9fb5SEric W. Biederman { 3610c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 3620c5c9fb5SEric W. Biederman pnet->net = net; 3630c5c9fb5SEric W. Biederman #endif 3640c5c9fb5SEric W. Biederman } 3650c5c9fb5SEric W. Biederman 3660c5c9fb5SEric W. Biederman static inline struct net *read_pnet(const possible_net_t *pnet) 3670c5c9fb5SEric W. Biederman { 3680c5c9fb5SEric W. Biederman #ifdef CONFIG_NET_NS 3690c5c9fb5SEric W. Biederman return pnet->net; 3700c5c9fb5SEric W. Biederman #else 3710c5c9fb5SEric W. Biederman return &init_net; 3720c5c9fb5SEric W. Biederman #endif 3730c5c9fb5SEric W. Biederman } 3745d1e4468SDenis V. Lunev 375f0b07bb1SKirill Tkhai /* Protected by net_rwsem */ 3765f256becSEric W. Biederman #define for_each_net(VAR) \ 3775f256becSEric W. Biederman list_for_each_entry(VAR, &net_namespace_list, list) 378afa0df59SJiri Pirko #define for_each_net_continue_reverse(VAR) \ 379afa0df59SJiri Pirko list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list) 38011a28d37SJohannes Berg #define for_each_net_rcu(VAR) \ 38111a28d37SJohannes Berg list_for_each_entry_rcu(VAR, &net_namespace_list, list) 38211a28d37SJohannes Berg 3834665079cSPavel Emelyanov #ifdef CONFIG_NET_NS 3844665079cSPavel Emelyanov #define __net_init 3854665079cSPavel Emelyanov #define __net_exit 386022cbae6SDenis V. Lunev #define __net_initdata 38704a6f82cSAndi Kleen #define __net_initconst 3884665079cSPavel Emelyanov #else 3894665079cSPavel Emelyanov #define __net_init __init 390bd721ea7SFabian Frederick #define __net_exit __ref 391022cbae6SDenis V. Lunev #define __net_initdata __initdata 39204a6f82cSAndi Kleen #define __net_initconst __initconst 3934665079cSPavel Emelyanov #endif 3945f256becSEric W. Biederman 395d4e4fdf9SGuillaume Nault int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp); 39656f200c7SGuillaume Nault int peernet2id(const struct net *net, struct net *peer); 39756f200c7SGuillaume Nault bool peernet_has_id(const struct net *net, struct net *peer); 39856f200c7SGuillaume Nault struct net *get_net_ns_by_id(const struct net *net, int id); 3990c7aecd4SNicolas Dichtel 4005f256becSEric W. Biederman struct pernet_operations { 4015f256becSEric W. Biederman struct list_head list; 4026056415dSKirill Tkhai /* 4036056415dSKirill Tkhai * Below methods are called without any exclusive locks. 4046056415dSKirill Tkhai * More than one net may be constructed and destructed 4056056415dSKirill Tkhai * in parallel on several cpus. Every pernet_operations 4066056415dSKirill Tkhai * have to keep in mind all other pernet_operations and 4076056415dSKirill Tkhai * to introduce a locking, if they share common resources. 4086056415dSKirill Tkhai * 4098518e9bbSKirill Tkhai * The only time they are called with exclusive lock is 4108518e9bbSKirill Tkhai * from register_pernet_subsys(), unregister_pernet_subsys() 4118518e9bbSKirill Tkhai * register_pernet_device() and unregister_pernet_device(). 4128518e9bbSKirill Tkhai * 4136056415dSKirill Tkhai * Exit methods using blocking RCU primitives, such as 4146056415dSKirill Tkhai * synchronize_rcu(), should be implemented via exit_batch. 4156056415dSKirill Tkhai * Then, destruction of a group of net requires single 4166056415dSKirill Tkhai * synchronize_rcu() related to these pernet_operations, 4176056415dSKirill Tkhai * instead of separate synchronize_rcu() for every net. 4186056415dSKirill Tkhai * Please, avoid synchronize_rcu() at all, where it's possible. 419d7d99872SEric Dumazet * 420d7d99872SEric Dumazet * Note that a combination of pre_exit() and exit() can 421d7d99872SEric Dumazet * be used, since a synchronize_rcu() is guaranteed between 422d7d99872SEric Dumazet * the calls. 4236056415dSKirill Tkhai */ 4245f256becSEric W. Biederman int (*init)(struct net *net); 425d7d99872SEric Dumazet void (*pre_exit)(struct net *net); 4265f256becSEric W. Biederman void (*exit)(struct net *net); 42772ad937aSEric W. Biederman void (*exit_batch)(struct list_head *net_exit_list); 428c7d03a00SAlexey Dobriyan unsigned int *id; 429f875bae0SEric W. Biederman size_t size; 4305f256becSEric W. Biederman }; 4315f256becSEric W. Biederman 43217edde52SEric W. Biederman /* 43317edde52SEric W. Biederman * Use these carefully. If you implement a network device and it 43417edde52SEric W. Biederman * needs per network namespace operations use device pernet operations, 43517edde52SEric W. Biederman * otherwise use pernet subsys operations. 43617edde52SEric W. Biederman * 4374edf547bSJohannes Berg * Network interfaces need to be removed from a dying netns _before_ 4384edf547bSJohannes Berg * subsys notifiers can be called, as most of the network code cleanup 4394edf547bSJohannes Berg * (which is done from subsys notifiers) runs with the assumption that 4404edf547bSJohannes Berg * dev_remove_pack has been called so no new packets will arrive during 4414edf547bSJohannes Berg * and after the cleanup functions have been called. dev_remove_pack 4424edf547bSJohannes Berg * is not per namespace so instead the guarantee of no more packets 4434edf547bSJohannes Berg * arriving in a network namespace is provided by ensuring that all 4444edf547bSJohannes Berg * network devices and all sockets have left the network namespace 4454edf547bSJohannes Berg * before the cleanup methods are called. 44617edde52SEric W. Biederman * 44717edde52SEric W. Biederman * For the longest time the ipv4 icmp code was registered as a pernet 44817edde52SEric W. Biederman * device which caused kernel oops, and panics during network 44917edde52SEric W. Biederman * namespace cleanup. So please don't get this wrong. 45017edde52SEric W. Biederman */ 451e67e16eaSJoe Perches int register_pernet_subsys(struct pernet_operations *); 452e67e16eaSJoe Perches void unregister_pernet_subsys(struct pernet_operations *); 453e67e16eaSJoe Perches int register_pernet_device(struct pernet_operations *); 454e67e16eaSJoe Perches void unregister_pernet_device(struct pernet_operations *); 455f875bae0SEric W. Biederman 45695bdfccbSEric W. Biederman struct ctl_table; 457d62c612eSPavel Emelyanov 4582ca794e5SEric W. Biederman #ifdef CONFIG_SYSCTL 459e67e16eaSJoe Perches int net_sysctl_init(void); 460e67e16eaSJoe Perches struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 461e67e16eaSJoe Perches struct ctl_table *table); 462e67e16eaSJoe Perches void unregister_net_sysctl_table(struct ctl_table_header *header); 46348c74958SEric W. Biederman #else 46448c74958SEric W. Biederman static inline int net_sysctl_init(void) { return 0; } 46548c74958SEric W. Biederman static inline struct ctl_table_header *register_net_sysctl(struct net *net, 46648c74958SEric W. Biederman const char *path, struct ctl_table *table) 46748c74958SEric W. Biederman { 46848c74958SEric W. Biederman return NULL; 46948c74958SEric W. Biederman } 47048c74958SEric W. Biederman static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 47148c74958SEric W. Biederman { 47248c74958SEric W. Biederman } 47348c74958SEric W. Biederman #endif 47448c74958SEric W. Biederman 47556f200c7SGuillaume Nault static inline int rt_genid_ipv4(const struct net *net) 476b42664f8SNicolas Dichtel { 477ca4c3fc2Sfan.du return atomic_read(&net->ipv4.rt_genid); 478b42664f8SNicolas Dichtel } 479b42664f8SNicolas Dichtel 4808f34e53bSDavid Ahern #if IS_ENABLED(CONFIG_IPV6) 4818f34e53bSDavid Ahern static inline int rt_genid_ipv6(const struct net *net) 4828f34e53bSDavid Ahern { 4838f34e53bSDavid Ahern return atomic_read(&net->ipv6.fib6_sernum); 4848f34e53bSDavid Ahern } 4858f34e53bSDavid Ahern #endif 4868f34e53bSDavid Ahern 487ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv4(struct net *net) 488b42664f8SNicolas Dichtel { 489ca4c3fc2Sfan.du atomic_inc(&net->ipv4.rt_genid); 490ca4c3fc2Sfan.du } 491ca4c3fc2Sfan.du 492705f1c86SHannes Frederic Sowa extern void (*__fib6_flush_trees)(struct net *net); 493ca4c3fc2Sfan.du static inline void rt_genid_bump_ipv6(struct net *net) 494ca4c3fc2Sfan.du { 495705f1c86SHannes Frederic Sowa if (__fib6_flush_trees) 496705f1c86SHannes Frederic Sowa __fib6_flush_trees(net); 497ca4c3fc2Sfan.du } 498ca4c3fc2Sfan.du 499599018a7SLuis R. Rodriguez #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 500599018a7SLuis R. Rodriguez static inline struct netns_ieee802154_lowpan * 501599018a7SLuis R. Rodriguez net_ieee802154_lowpan(struct net *net) 502599018a7SLuis R. Rodriguez { 503599018a7SLuis R. Rodriguez return &net->ieee802154_lowpan; 504599018a7SLuis R. Rodriguez } 505599018a7SLuis R. Rodriguez #endif 506599018a7SLuis R. Rodriguez 507ca4c3fc2Sfan.du /* For callers who don't really care about whether it's IPv4 or IPv6 */ 508ca4c3fc2Sfan.du static inline void rt_genid_bump_all(struct net *net) 509ca4c3fc2Sfan.du { 510ca4c3fc2Sfan.du rt_genid_bump_ipv4(net); 511ca4c3fc2Sfan.du rt_genid_bump_ipv6(net); 512b42664f8SNicolas Dichtel } 51395bdfccbSEric W. Biederman 51456f200c7SGuillaume Nault static inline int fnhe_genid(const struct net *net) 5155aad1de5STimo Teräs { 5165aad1de5STimo Teräs return atomic_read(&net->fnhe_genid); 5175aad1de5STimo Teräs } 5185aad1de5STimo Teräs 5195aad1de5STimo Teräs static inline void fnhe_genid_bump(struct net *net) 5205aad1de5STimo Teräs { 5215aad1de5STimo Teräs atomic_inc(&net->fnhe_genid); 5225aad1de5STimo Teräs } 5235aad1de5STimo Teräs 5249c1be193SEric Dumazet #ifdef CONFIG_NET 5259c1be193SEric Dumazet void net_ns_init(void); 5269c1be193SEric Dumazet #else 5279c1be193SEric Dumazet static inline void net_ns_init(void) {} 5289c1be193SEric Dumazet #endif 5299c1be193SEric Dumazet 5305f256becSEric W. Biederman #endif /* __NET_NET_NAMESPACE_H */ 531