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