1 /* 2 * Operations on the network namespace 3 */ 4 #ifndef __NET_NET_NAMESPACE_H 5 #define __NET_NET_NAMESPACE_H 6 7 #include <linux/atomic.h> 8 #include <linux/workqueue.h> 9 #include <linux/list.h> 10 #include <linux/sysctl.h> 11 12 #include <net/flow.h> 13 #include <net/netns/core.h> 14 #include <net/netns/mib.h> 15 #include <net/netns/unix.h> 16 #include <net/netns/packet.h> 17 #include <net/netns/ipv4.h> 18 #include <net/netns/ipv6.h> 19 #include <net/netns/ieee802154_6lowpan.h> 20 #include <net/netns/sctp.h> 21 #include <net/netns/dccp.h> 22 #include <net/netns/netfilter.h> 23 #include <net/netns/x_tables.h> 24 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 25 #include <net/netns/conntrack.h> 26 #endif 27 #include <net/netns/nftables.h> 28 #include <net/netns/xfrm.h> 29 #include <net/netns/mpls.h> 30 #include <linux/ns_common.h> 31 32 struct user_namespace; 33 struct proc_dir_entry; 34 struct net_device; 35 struct sock; 36 struct ctl_table_header; 37 struct net_generic; 38 struct sock; 39 struct netns_ipvs; 40 41 42 #define NETDEV_HASHBITS 8 43 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 44 45 struct net { 46 atomic_t passive; /* To decided when the network 47 * namespace should be freed. 48 */ 49 atomic_t count; /* To decided when the network 50 * namespace should be shut down. 51 */ 52 #ifdef NETNS_REFCNT_DEBUG 53 atomic_t use_count; /* To track references we 54 * destroy on demand 55 */ 56 #endif 57 spinlock_t rules_mod_lock; 58 59 struct list_head list; /* list of network namespaces */ 60 struct list_head cleanup_list; /* namespaces on death row */ 61 struct list_head exit_list; /* Use only net_mutex */ 62 63 struct user_namespace *user_ns; /* Owning user namespace */ 64 struct idr netns_ids; 65 66 struct ns_common ns; 67 68 struct proc_dir_entry *proc_net; 69 struct proc_dir_entry *proc_net_stat; 70 71 #ifdef CONFIG_SYSCTL 72 struct ctl_table_set sysctls; 73 #endif 74 75 struct sock *rtnl; /* rtnetlink socket */ 76 struct sock *genl_sock; 77 78 struct list_head dev_base_head; 79 struct hlist_head *dev_name_head; 80 struct hlist_head *dev_index_head; 81 unsigned int dev_base_seq; /* protected by rtnl_mutex */ 82 int ifindex; 83 unsigned int dev_unreg_count; 84 85 /* core fib_rules */ 86 struct list_head rules_ops; 87 88 89 struct net_device *loopback_dev; /* The loopback */ 90 struct netns_core core; 91 struct netns_mib mib; 92 struct netns_packet packet; 93 struct netns_unix unx; 94 struct netns_ipv4 ipv4; 95 #if IS_ENABLED(CONFIG_IPV6) 96 struct netns_ipv6 ipv6; 97 #endif 98 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 99 struct netns_ieee802154_lowpan ieee802154_lowpan; 100 #endif 101 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 102 struct netns_sctp sctp; 103 #endif 104 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 105 struct netns_dccp dccp; 106 #endif 107 #ifdef CONFIG_NETFILTER 108 struct netns_nf nf; 109 struct netns_xt xt; 110 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 111 struct netns_ct ct; 112 #endif 113 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 114 struct netns_nftables nft; 115 #endif 116 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 117 struct netns_nf_frag nf_frag; 118 #endif 119 struct sock *nfnl; 120 struct sock *nfnl_stash; 121 #endif 122 #ifdef CONFIG_WEXT_CORE 123 struct sk_buff_head wext_nlevents; 124 #endif 125 struct net_generic __rcu *gen; 126 127 /* Note : following structs are cache line aligned */ 128 #ifdef CONFIG_XFRM 129 struct netns_xfrm xfrm; 130 #endif 131 #if IS_ENABLED(CONFIG_IP_VS) 132 struct netns_ipvs *ipvs; 133 #endif 134 #if IS_ENABLED(CONFIG_MPLS) 135 struct netns_mpls mpls; 136 #endif 137 struct sock *diag_nlsk; 138 atomic_t fnhe_genid; 139 }; 140 141 #include <linux/seq_file_net.h> 142 143 /* Init's network namespace */ 144 extern struct net init_net; 145 146 #ifdef CONFIG_NET_NS 147 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 148 struct net *old_net); 149 150 #else /* CONFIG_NET_NS */ 151 #include <linux/sched.h> 152 #include <linux/nsproxy.h> 153 static inline struct net *copy_net_ns(unsigned long flags, 154 struct user_namespace *user_ns, struct net *old_net) 155 { 156 if (flags & CLONE_NEWNET) 157 return ERR_PTR(-EINVAL); 158 return old_net; 159 } 160 #endif /* CONFIG_NET_NS */ 161 162 163 extern struct list_head net_namespace_list; 164 165 struct net *get_net_ns_by_pid(pid_t pid); 166 struct net *get_net_ns_by_fd(int pid); 167 168 #ifdef CONFIG_SYSCTL 169 void ipx_register_sysctl(void); 170 void ipx_unregister_sysctl(void); 171 #else 172 #define ipx_register_sysctl() 173 #define ipx_unregister_sysctl() 174 #endif 175 176 #ifdef CONFIG_NET_NS 177 void __put_net(struct net *net); 178 179 static inline struct net *get_net(struct net *net) 180 { 181 atomic_inc(&net->count); 182 return net; 183 } 184 185 static inline struct net *maybe_get_net(struct net *net) 186 { 187 /* Used when we know struct net exists but we 188 * aren't guaranteed a previous reference count 189 * exists. If the reference count is zero this 190 * function fails and returns NULL. 191 */ 192 if (!atomic_inc_not_zero(&net->count)) 193 net = NULL; 194 return net; 195 } 196 197 static inline void put_net(struct net *net) 198 { 199 if (atomic_dec_and_test(&net->count)) 200 __put_net(net); 201 } 202 203 static inline 204 int net_eq(const struct net *net1, const struct net *net2) 205 { 206 return net1 == net2; 207 } 208 209 void net_drop_ns(void *); 210 211 #else 212 213 static inline struct net *get_net(struct net *net) 214 { 215 return net; 216 } 217 218 static inline void put_net(struct net *net) 219 { 220 } 221 222 static inline struct net *maybe_get_net(struct net *net) 223 { 224 return net; 225 } 226 227 static inline 228 int net_eq(const struct net *net1, const struct net *net2) 229 { 230 return 1; 231 } 232 233 #define net_drop_ns NULL 234 #endif 235 236 237 #ifdef NETNS_REFCNT_DEBUG 238 static inline struct net *hold_net(struct net *net) 239 { 240 if (net) 241 atomic_inc(&net->use_count); 242 return net; 243 } 244 245 static inline void release_net(struct net *net) 246 { 247 if (net) 248 atomic_dec(&net->use_count); 249 } 250 #else 251 static inline struct net *hold_net(struct net *net) 252 { 253 return net; 254 } 255 256 static inline void release_net(struct net *net) 257 { 258 } 259 #endif 260 261 #ifdef CONFIG_NET_NS 262 263 static inline void write_pnet(struct net **pnet, struct net *net) 264 { 265 *pnet = net; 266 } 267 268 static inline struct net *read_pnet(struct net * const *pnet) 269 { 270 return *pnet; 271 } 272 273 #else 274 275 #define write_pnet(pnet, net) do { (void)(net);} while (0) 276 #define read_pnet(pnet) (&init_net) 277 278 #endif 279 280 #define for_each_net(VAR) \ 281 list_for_each_entry(VAR, &net_namespace_list, list) 282 283 #define for_each_net_rcu(VAR) \ 284 list_for_each_entry_rcu(VAR, &net_namespace_list, list) 285 286 #ifdef CONFIG_NET_NS 287 #define __net_init 288 #define __net_exit 289 #define __net_initdata 290 #define __net_initconst 291 #else 292 #define __net_init __init 293 #define __net_exit __exit_refok 294 #define __net_initdata __initdata 295 #define __net_initconst __initconst 296 #endif 297 298 int peernet2id(struct net *net, struct net *peer); 299 struct net *get_net_ns_by_id(struct net *net, int id); 300 301 struct pernet_operations { 302 struct list_head list; 303 int (*init)(struct net *net); 304 void (*exit)(struct net *net); 305 void (*exit_batch)(struct list_head *net_exit_list); 306 int *id; 307 size_t size; 308 }; 309 310 /* 311 * Use these carefully. If you implement a network device and it 312 * needs per network namespace operations use device pernet operations, 313 * otherwise use pernet subsys operations. 314 * 315 * Network interfaces need to be removed from a dying netns _before_ 316 * subsys notifiers can be called, as most of the network code cleanup 317 * (which is done from subsys notifiers) runs with the assumption that 318 * dev_remove_pack has been called so no new packets will arrive during 319 * and after the cleanup functions have been called. dev_remove_pack 320 * is not per namespace so instead the guarantee of no more packets 321 * arriving in a network namespace is provided by ensuring that all 322 * network devices and all sockets have left the network namespace 323 * before the cleanup methods are called. 324 * 325 * For the longest time the ipv4 icmp code was registered as a pernet 326 * device which caused kernel oops, and panics during network 327 * namespace cleanup. So please don't get this wrong. 328 */ 329 int register_pernet_subsys(struct pernet_operations *); 330 void unregister_pernet_subsys(struct pernet_operations *); 331 int register_pernet_device(struct pernet_operations *); 332 void unregister_pernet_device(struct pernet_operations *); 333 334 struct ctl_table; 335 struct ctl_table_header; 336 337 #ifdef CONFIG_SYSCTL 338 int net_sysctl_init(void); 339 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 340 struct ctl_table *table); 341 void unregister_net_sysctl_table(struct ctl_table_header *header); 342 #else 343 static inline int net_sysctl_init(void) { return 0; } 344 static inline struct ctl_table_header *register_net_sysctl(struct net *net, 345 const char *path, struct ctl_table *table) 346 { 347 return NULL; 348 } 349 static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 350 { 351 } 352 #endif 353 354 static inline int rt_genid_ipv4(struct net *net) 355 { 356 return atomic_read(&net->ipv4.rt_genid); 357 } 358 359 static inline void rt_genid_bump_ipv4(struct net *net) 360 { 361 atomic_inc(&net->ipv4.rt_genid); 362 } 363 364 extern void (*__fib6_flush_trees)(struct net *net); 365 static inline void rt_genid_bump_ipv6(struct net *net) 366 { 367 if (__fib6_flush_trees) 368 __fib6_flush_trees(net); 369 } 370 371 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 372 static inline struct netns_ieee802154_lowpan * 373 net_ieee802154_lowpan(struct net *net) 374 { 375 return &net->ieee802154_lowpan; 376 } 377 #endif 378 379 /* For callers who don't really care about whether it's IPv4 or IPv6 */ 380 static inline void rt_genid_bump_all(struct net *net) 381 { 382 rt_genid_bump_ipv4(net); 383 rt_genid_bump_ipv6(net); 384 } 385 386 static inline int fnhe_genid(struct net *net) 387 { 388 return atomic_read(&net->fnhe_genid); 389 } 390 391 static inline void fnhe_genid_bump(struct net *net) 392 { 393 atomic_inc(&net->fnhe_genid); 394 } 395 396 #endif /* __NET_NET_NAMESPACE_H */ 397