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