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/netns/core.h> 13 #include <net/netns/mib.h> 14 #include <net/netns/unix.h> 15 #include <net/netns/packet.h> 16 #include <net/netns/ipv4.h> 17 #include <net/netns/ipv6.h> 18 #include <net/netns/ieee802154_6lowpan.h> 19 #include <net/netns/sctp.h> 20 #include <net/netns/dccp.h> 21 #include <net/netns/netfilter.h> 22 #include <net/netns/x_tables.h> 23 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 24 #include <net/netns/conntrack.h> 25 #endif 26 #include <net/netns/nftables.h> 27 #include <net/netns/xfrm.h> 28 29 struct user_namespace; 30 struct proc_dir_entry; 31 struct net_device; 32 struct sock; 33 struct ctl_table_header; 34 struct net_generic; 35 struct sock; 36 struct netns_ipvs; 37 38 39 #define NETDEV_HASHBITS 8 40 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 41 42 struct net { 43 atomic_t passive; /* To decided when the network 44 * namespace should be freed. 45 */ 46 atomic_t count; /* To decided when the network 47 * namespace should be shut down. 48 */ 49 #ifdef NETNS_REFCNT_DEBUG 50 atomic_t use_count; /* To track references we 51 * destroy on demand 52 */ 53 #endif 54 spinlock_t rules_mod_lock; 55 56 struct list_head list; /* list of network namespaces */ 57 struct list_head cleanup_list; /* namespaces on death row */ 58 struct list_head exit_list; /* Use only net_mutex */ 59 60 struct user_namespace *user_ns; /* Owning user namespace */ 61 62 unsigned int proc_inum; 63 64 struct proc_dir_entry *proc_net; 65 struct proc_dir_entry *proc_net_stat; 66 67 #ifdef CONFIG_SYSCTL 68 struct ctl_table_set sysctls; 69 #endif 70 71 struct sock *rtnl; /* rtnetlink socket */ 72 struct sock *genl_sock; 73 74 struct list_head dev_base_head; 75 struct hlist_head *dev_name_head; 76 struct hlist_head *dev_index_head; 77 unsigned int dev_base_seq; /* protected by rtnl_mutex */ 78 int ifindex; 79 unsigned int dev_unreg_count; 80 81 /* core fib_rules */ 82 struct list_head rules_ops; 83 84 85 struct net_device *loopback_dev; /* The loopback */ 86 struct netns_core core; 87 struct netns_mib mib; 88 struct netns_packet packet; 89 struct netns_unix unx; 90 struct netns_ipv4 ipv4; 91 #if IS_ENABLED(CONFIG_IPV6) 92 struct netns_ipv6 ipv6; 93 #endif 94 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 95 struct netns_ieee802154_lowpan ieee802154_lowpan; 96 #endif 97 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 98 struct netns_sctp sctp; 99 #endif 100 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 101 struct netns_dccp dccp; 102 #endif 103 #ifdef CONFIG_NETFILTER 104 struct netns_nf nf; 105 struct netns_xt xt; 106 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 107 struct netns_ct ct; 108 #endif 109 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 110 struct netns_nftables nft; 111 #endif 112 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 113 struct netns_nf_frag nf_frag; 114 #endif 115 struct sock *nfnl; 116 struct sock *nfnl_stash; 117 #endif 118 #ifdef CONFIG_WEXT_CORE 119 struct sk_buff_head wext_nlevents; 120 #endif 121 struct net_generic __rcu *gen; 122 123 /* Note : following structs are cache line aligned */ 124 #ifdef CONFIG_XFRM 125 struct netns_xfrm xfrm; 126 #endif 127 #if IS_ENABLED(CONFIG_IP_VS) 128 struct netns_ipvs *ipvs; 129 #endif 130 struct sock *diag_nlsk; 131 atomic_t fnhe_genid; 132 }; 133 134 /* 135 * ifindex generation is per-net namespace, and loopback is 136 * always the 1st device in ns (see net_dev_init), thus any 137 * loopback device should get ifindex 1 138 */ 139 140 #define LOOPBACK_IFINDEX 1 141 142 #include <linux/seq_file_net.h> 143 144 /* Init's network namespace */ 145 extern struct net init_net; 146 147 #ifdef CONFIG_NET_NS 148 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 149 struct net *old_net); 150 151 #else /* CONFIG_NET_NS */ 152 #include <linux/sched.h> 153 #include <linux/nsproxy.h> 154 static inline struct net *copy_net_ns(unsigned long flags, 155 struct user_namespace *user_ns, struct net *old_net) 156 { 157 if (flags & CLONE_NEWNET) 158 return ERR_PTR(-EINVAL); 159 return old_net; 160 } 161 #endif /* CONFIG_NET_NS */ 162 163 164 extern struct list_head net_namespace_list; 165 166 struct net *get_net_ns_by_pid(pid_t pid); 167 struct net *get_net_ns_by_fd(int pid); 168 169 #ifdef CONFIG_SYSCTL 170 void ipx_register_sysctl(void); 171 void ipx_unregister_sysctl(void); 172 #else 173 #define ipx_register_sysctl() 174 #define ipx_unregister_sysctl() 175 #endif 176 177 #ifdef CONFIG_NET_NS 178 void __put_net(struct net *net); 179 180 static inline struct net *get_net(struct net *net) 181 { 182 atomic_inc(&net->count); 183 return net; 184 } 185 186 static inline struct net *maybe_get_net(struct net *net) 187 { 188 /* Used when we know struct net exists but we 189 * aren't guaranteed a previous reference count 190 * exists. If the reference count is zero this 191 * function fails and returns NULL. 192 */ 193 if (!atomic_inc_not_zero(&net->count)) 194 net = NULL; 195 return net; 196 } 197 198 static inline void put_net(struct net *net) 199 { 200 if (atomic_dec_and_test(&net->count)) 201 __put_net(net); 202 } 203 204 static inline 205 int net_eq(const struct net *net1, const struct net *net2) 206 { 207 return net1 == net2; 208 } 209 210 void net_drop_ns(void *); 211 212 #else 213 214 static inline struct net *get_net(struct net *net) 215 { 216 return net; 217 } 218 219 static inline void put_net(struct net *net) 220 { 221 } 222 223 static inline struct net *maybe_get_net(struct net *net) 224 { 225 return net; 226 } 227 228 static inline 229 int net_eq(const struct net *net1, const struct net *net2) 230 { 231 return 1; 232 } 233 234 #define net_drop_ns NULL 235 #endif 236 237 238 #ifdef NETNS_REFCNT_DEBUG 239 static inline struct net *hold_net(struct net *net) 240 { 241 if (net) 242 atomic_inc(&net->use_count); 243 return net; 244 } 245 246 static inline void release_net(struct net *net) 247 { 248 if (net) 249 atomic_dec(&net->use_count); 250 } 251 #else 252 static inline struct net *hold_net(struct net *net) 253 { 254 return net; 255 } 256 257 static inline void release_net(struct net *net) 258 { 259 } 260 #endif 261 262 #ifdef CONFIG_NET_NS 263 264 static inline void write_pnet(struct net **pnet, struct net *net) 265 { 266 *pnet = net; 267 } 268 269 static inline struct net *read_pnet(struct net * const *pnet) 270 { 271 return *pnet; 272 } 273 274 #else 275 276 #define write_pnet(pnet, net) do { (void)(net);} while (0) 277 #define read_pnet(pnet) (&init_net) 278 279 #endif 280 281 #define for_each_net(VAR) \ 282 list_for_each_entry(VAR, &net_namespace_list, list) 283 284 #define for_each_net_rcu(VAR) \ 285 list_for_each_entry_rcu(VAR, &net_namespace_list, list) 286 287 #ifdef CONFIG_NET_NS 288 #define __net_init 289 #define __net_exit 290 #define __net_initdata 291 #define __net_initconst 292 #else 293 #define __net_init __init 294 #define __net_exit __exit_refok 295 #define __net_initdata __initdata 296 #define __net_initconst __initconst 297 #endif 298 299 struct pernet_operations { 300 struct list_head list; 301 int (*init)(struct net *net); 302 void (*exit)(struct net *net); 303 void (*exit_batch)(struct list_head *net_exit_list); 304 int *id; 305 size_t size; 306 }; 307 308 /* 309 * Use these carefully. If you implement a network device and it 310 * needs per network namespace operations use device pernet operations, 311 * otherwise use pernet subsys operations. 312 * 313 * Network interfaces need to be removed from a dying netns _before_ 314 * subsys notifiers can be called, as most of the network code cleanup 315 * (which is done from subsys notifiers) runs with the assumption that 316 * dev_remove_pack has been called so no new packets will arrive during 317 * and after the cleanup functions have been called. dev_remove_pack 318 * is not per namespace so instead the guarantee of no more packets 319 * arriving in a network namespace is provided by ensuring that all 320 * network devices and all sockets have left the network namespace 321 * before the cleanup methods are called. 322 * 323 * For the longest time the ipv4 icmp code was registered as a pernet 324 * device which caused kernel oops, and panics during network 325 * namespace cleanup. So please don't get this wrong. 326 */ 327 int register_pernet_subsys(struct pernet_operations *); 328 void unregister_pernet_subsys(struct pernet_operations *); 329 int register_pernet_device(struct pernet_operations *); 330 void unregister_pernet_device(struct pernet_operations *); 331 332 struct ctl_table; 333 struct ctl_table_header; 334 335 #ifdef CONFIG_SYSCTL 336 int net_sysctl_init(void); 337 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 338 struct ctl_table *table); 339 void unregister_net_sysctl_table(struct ctl_table_header *header); 340 #else 341 static inline int net_sysctl_init(void) { return 0; } 342 static inline struct ctl_table_header *register_net_sysctl(struct net *net, 343 const char *path, struct ctl_table *table) 344 { 345 return NULL; 346 } 347 static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 348 { 349 } 350 #endif 351 352 static inline int rt_genid_ipv4(struct net *net) 353 { 354 return atomic_read(&net->ipv4.rt_genid); 355 } 356 357 static inline void rt_genid_bump_ipv4(struct net *net) 358 { 359 atomic_inc(&net->ipv4.rt_genid); 360 } 361 362 #if IS_ENABLED(CONFIG_IPV6) 363 static inline int rt_genid_ipv6(struct net *net) 364 { 365 return atomic_read(&net->ipv6.rt_genid); 366 } 367 368 static inline void rt_genid_bump_ipv6(struct net *net) 369 { 370 atomic_inc(&net->ipv6.rt_genid); 371 } 372 #else 373 static inline int rt_genid_ipv6(struct net *net) 374 { 375 return 0; 376 } 377 378 static inline void rt_genid_bump_ipv6(struct net *net) 379 { 380 } 381 #endif 382 383 /* For callers who don't really care about whether it's IPv4 or IPv6 */ 384 static inline void rt_genid_bump_all(struct net *net) 385 { 386 rt_genid_bump_ipv4(net); 387 rt_genid_bump_ipv6(net); 388 } 389 390 static inline int fnhe_genid(struct net *net) 391 { 392 return atomic_read(&net->fnhe_genid); 393 } 394 395 static inline void fnhe_genid_bump(struct net *net) 396 { 397 atomic_inc(&net->fnhe_genid); 398 } 399 400 #endif /* __NET_NET_NAMESPACE_H */ 401