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/refcount.h> 9 #include <linux/workqueue.h> 10 #include <linux/list.h> 11 #include <linux/sysctl.h> 12 13 #include <net/flow.h> 14 #include <net/netns/core.h> 15 #include <net/netns/mib.h> 16 #include <net/netns/unix.h> 17 #include <net/netns/packet.h> 18 #include <net/netns/ipv4.h> 19 #include <net/netns/ipv6.h> 20 #include <net/netns/ieee802154_6lowpan.h> 21 #include <net/netns/sctp.h> 22 #include <net/netns/dccp.h> 23 #include <net/netns/netfilter.h> 24 #include <net/netns/x_tables.h> 25 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 26 #include <net/netns/conntrack.h> 27 #endif 28 #include <net/netns/nftables.h> 29 #include <net/netns/xfrm.h> 30 #include <net/netns/mpls.h> 31 #include <net/netns/can.h> 32 #include <linux/ns_common.h> 33 #include <linux/idr.h> 34 #include <linux/skbuff.h> 35 36 struct user_namespace; 37 struct proc_dir_entry; 38 struct net_device; 39 struct sock; 40 struct ctl_table_header; 41 struct net_generic; 42 struct sock; 43 struct netns_ipvs; 44 45 46 #define NETDEV_HASHBITS 8 47 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 48 49 struct net { 50 refcount_t passive; /* To decided when the network 51 * namespace should be freed. 52 */ 53 atomic_t count; /* To decided when the network 54 * namespace should be shut down. 55 */ 56 spinlock_t rules_mod_lock; 57 58 atomic64_t cookie_gen; 59 60 struct list_head list; /* list of network namespaces */ 61 struct list_head cleanup_list; /* namespaces on death row */ 62 struct list_head exit_list; /* Use only net_mutex */ 63 64 struct user_namespace *user_ns; /* Owning user namespace */ 65 struct ucounts *ucounts; 66 spinlock_t nsid_lock; 67 struct idr netns_ids; 68 69 struct ns_common ns; 70 71 struct proc_dir_entry *proc_net; 72 struct proc_dir_entry *proc_net_stat; 73 74 #ifdef CONFIG_SYSCTL 75 struct ctl_table_set sysctls; 76 #endif 77 78 struct sock *rtnl; /* rtnetlink socket */ 79 struct sock *genl_sock; 80 81 struct list_head dev_base_head; 82 struct hlist_head *dev_name_head; 83 struct hlist_head *dev_index_head; 84 unsigned int dev_base_seq; /* protected by rtnl_mutex */ 85 int ifindex; 86 unsigned int dev_unreg_count; 87 88 /* core fib_rules */ 89 struct list_head rules_ops; 90 91 92 struct net_device *loopback_dev; /* The loopback */ 93 struct netns_core core; 94 struct netns_mib mib; 95 struct netns_packet packet; 96 struct netns_unix unx; 97 struct netns_ipv4 ipv4; 98 #if IS_ENABLED(CONFIG_IPV6) 99 struct netns_ipv6 ipv6; 100 #endif 101 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 102 struct netns_ieee802154_lowpan ieee802154_lowpan; 103 #endif 104 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 105 struct netns_sctp sctp; 106 #endif 107 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 108 struct netns_dccp dccp; 109 #endif 110 #ifdef CONFIG_NETFILTER 111 struct netns_nf nf; 112 struct netns_xt xt; 113 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 114 struct netns_ct ct; 115 #endif 116 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 117 struct netns_nftables nft; 118 #endif 119 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 120 struct netns_nf_frag nf_frag; 121 #endif 122 struct sock *nfnl; 123 struct sock *nfnl_stash; 124 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT) 125 struct list_head nfnl_acct_list; 126 #endif 127 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) 128 struct list_head nfct_timeout_list; 129 #endif 130 #endif 131 #ifdef CONFIG_WEXT_CORE 132 struct sk_buff_head wext_nlevents; 133 #endif 134 struct net_generic __rcu *gen; 135 136 /* Note : following structs are cache line aligned */ 137 #ifdef CONFIG_XFRM 138 struct netns_xfrm xfrm; 139 #endif 140 #if IS_ENABLED(CONFIG_IP_VS) 141 struct netns_ipvs *ipvs; 142 #endif 143 #if IS_ENABLED(CONFIG_MPLS) 144 struct netns_mpls mpls; 145 #endif 146 #if IS_ENABLED(CONFIG_CAN) 147 struct netns_can can; 148 #endif 149 struct sock *diag_nlsk; 150 atomic_t fnhe_genid; 151 } __randomize_layout; 152 153 #include <linux/seq_file_net.h> 154 155 /* Init's network namespace */ 156 extern struct net init_net; 157 158 #ifdef CONFIG_NET_NS 159 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 160 struct net *old_net); 161 162 void net_ns_barrier(void); 163 #else /* CONFIG_NET_NS */ 164 #include <linux/sched.h> 165 #include <linux/nsproxy.h> 166 static inline struct net *copy_net_ns(unsigned long flags, 167 struct user_namespace *user_ns, struct net *old_net) 168 { 169 if (flags & CLONE_NEWNET) 170 return ERR_PTR(-EINVAL); 171 return old_net; 172 } 173 174 static inline void net_ns_barrier(void) {} 175 #endif /* CONFIG_NET_NS */ 176 177 178 extern struct list_head net_namespace_list; 179 180 struct net *get_net_ns_by_pid(pid_t pid); 181 struct net *get_net_ns_by_fd(int fd); 182 183 #ifdef CONFIG_SYSCTL 184 void ipx_register_sysctl(void); 185 void ipx_unregister_sysctl(void); 186 #else 187 #define ipx_register_sysctl() 188 #define ipx_unregister_sysctl() 189 #endif 190 191 #ifdef CONFIG_NET_NS 192 void __put_net(struct net *net); 193 194 static inline struct net *get_net(struct net *net) 195 { 196 atomic_inc(&net->count); 197 return net; 198 } 199 200 static inline struct net *maybe_get_net(struct net *net) 201 { 202 /* Used when we know struct net exists but we 203 * aren't guaranteed a previous reference count 204 * exists. If the reference count is zero this 205 * function fails and returns NULL. 206 */ 207 if (!atomic_inc_not_zero(&net->count)) 208 net = NULL; 209 return net; 210 } 211 212 static inline void put_net(struct net *net) 213 { 214 if (atomic_dec_and_test(&net->count)) 215 __put_net(net); 216 } 217 218 static inline 219 int net_eq(const struct net *net1, const struct net *net2) 220 { 221 return net1 == net2; 222 } 223 224 void net_drop_ns(void *); 225 226 #else 227 228 static inline struct net *get_net(struct net *net) 229 { 230 return net; 231 } 232 233 static inline void put_net(struct net *net) 234 { 235 } 236 237 static inline struct net *maybe_get_net(struct net *net) 238 { 239 return net; 240 } 241 242 static inline 243 int net_eq(const struct net *net1, const struct net *net2) 244 { 245 return 1; 246 } 247 248 #define net_drop_ns NULL 249 #endif 250 251 252 typedef struct { 253 #ifdef CONFIG_NET_NS 254 struct net *net; 255 #endif 256 } possible_net_t; 257 258 static inline void write_pnet(possible_net_t *pnet, struct net *net) 259 { 260 #ifdef CONFIG_NET_NS 261 pnet->net = net; 262 #endif 263 } 264 265 static inline struct net *read_pnet(const possible_net_t *pnet) 266 { 267 #ifdef CONFIG_NET_NS 268 return pnet->net; 269 #else 270 return &init_net; 271 #endif 272 } 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 __ref 288 #define __net_initdata __initdata 289 #define __net_initconst __initconst 290 #endif 291 292 int peernet2id_alloc(struct net *net, struct net *peer); 293 int peernet2id(struct net *net, struct net *peer); 294 bool peernet_has_id(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 unsigned 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