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