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 <net/netns/mpls.h> 30 #include <net/netns/can.h> 31 #include <linux/ns_common.h> 32 #include <linux/idr.h> 33 #include <linux/skbuff.h> 34 35 struct user_namespace; 36 struct proc_dir_entry; 37 struct net_device; 38 struct sock; 39 struct ctl_table_header; 40 struct net_generic; 41 struct sock; 42 struct netns_ipvs; 43 44 45 #define NETDEV_HASHBITS 8 46 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 47 48 struct net { 49 atomic_t passive; /* To decided when the network 50 * namespace should be freed. 51 */ 52 atomic_t count; /* To decided when the network 53 * namespace should be shut down. 54 */ 55 spinlock_t rules_mod_lock; 56 57 atomic64_t cookie_gen; 58 59 struct list_head list; /* list of network namespaces */ 60 struct list_head cleanup_list; /* namespaces on death row */ 61 struct list_head exit_list; /* Use only net_mutex */ 62 63 struct user_namespace *user_ns; /* Owning user namespace */ 64 struct ucounts *ucounts; 65 spinlock_t nsid_lock; 66 struct idr netns_ids; 67 68 struct ns_common ns; 69 70 struct proc_dir_entry *proc_net; 71 struct proc_dir_entry *proc_net_stat; 72 73 #ifdef CONFIG_SYSCTL 74 struct ctl_table_set sysctls; 75 #endif 76 77 struct sock *rtnl; /* rtnetlink socket */ 78 struct sock *genl_sock; 79 80 struct list_head dev_base_head; 81 struct hlist_head *dev_name_head; 82 struct hlist_head *dev_index_head; 83 unsigned int dev_base_seq; /* protected by rtnl_mutex */ 84 int ifindex; 85 unsigned int dev_unreg_count; 86 87 /* core fib_rules */ 88 struct list_head rules_ops; 89 90 91 struct net_device *loopback_dev; /* The loopback */ 92 struct netns_core core; 93 struct netns_mib mib; 94 struct netns_packet packet; 95 struct netns_unix unx; 96 struct netns_ipv4 ipv4; 97 #if IS_ENABLED(CONFIG_IPV6) 98 struct netns_ipv6 ipv6; 99 #endif 100 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 101 struct netns_ieee802154_lowpan ieee802154_lowpan; 102 #endif 103 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 104 struct netns_sctp sctp; 105 #endif 106 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 107 struct netns_dccp dccp; 108 #endif 109 #ifdef CONFIG_NETFILTER 110 struct netns_nf nf; 111 struct netns_xt xt; 112 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 113 struct netns_ct ct; 114 #endif 115 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 116 struct netns_nftables nft; 117 #endif 118 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 119 struct netns_nf_frag nf_frag; 120 #endif 121 struct sock *nfnl; 122 struct sock *nfnl_stash; 123 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT) 124 struct list_head nfnl_acct_list; 125 #endif 126 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) 127 struct list_head nfct_timeout_list; 128 #endif 129 #endif 130 #ifdef CONFIG_WEXT_CORE 131 struct sk_buff_head wext_nlevents; 132 #endif 133 struct net_generic __rcu *gen; 134 135 /* Note : following structs are cache line aligned */ 136 #ifdef CONFIG_XFRM 137 struct netns_xfrm xfrm; 138 #endif 139 #if IS_ENABLED(CONFIG_IP_VS) 140 struct netns_ipvs *ipvs; 141 #endif 142 #if IS_ENABLED(CONFIG_MPLS) 143 struct netns_mpls mpls; 144 #endif 145 #if IS_ENABLED(CONFIG_CAN) 146 struct netns_can can; 147 #endif 148 struct sock *diag_nlsk; 149 atomic_t fnhe_genid; 150 }; 151 152 #include <linux/seq_file_net.h> 153 154 /* Init's network namespace */ 155 extern struct net init_net; 156 157 #ifdef CONFIG_NET_NS 158 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 159 struct net *old_net); 160 161 void net_ns_barrier(void); 162 #else /* CONFIG_NET_NS */ 163 #include <linux/sched.h> 164 #include <linux/nsproxy.h> 165 static inline struct net *copy_net_ns(unsigned long flags, 166 struct user_namespace *user_ns, struct net *old_net) 167 { 168 if (flags & CLONE_NEWNET) 169 return ERR_PTR(-EINVAL); 170 return old_net; 171 } 172 173 static inline void net_ns_barrier(void) {} 174 #endif /* CONFIG_NET_NS */ 175 176 177 extern struct list_head net_namespace_list; 178 179 struct net *get_net_ns_by_pid(pid_t pid); 180 struct net *get_net_ns_by_fd(int fd); 181 182 #ifdef CONFIG_SYSCTL 183 void ipx_register_sysctl(void); 184 void ipx_unregister_sysctl(void); 185 #else 186 #define ipx_register_sysctl() 187 #define ipx_unregister_sysctl() 188 #endif 189 190 #ifdef CONFIG_NET_NS 191 void __put_net(struct net *net); 192 193 static inline struct net *get_net(struct net *net) 194 { 195 atomic_inc(&net->count); 196 return net; 197 } 198 199 static inline struct net *maybe_get_net(struct net *net) 200 { 201 /* Used when we know struct net exists but we 202 * aren't guaranteed a previous reference count 203 * exists. If the reference count is zero this 204 * function fails and returns NULL. 205 */ 206 if (!atomic_inc_not_zero(&net->count)) 207 net = NULL; 208 return net; 209 } 210 211 static inline void put_net(struct net *net) 212 { 213 if (atomic_dec_and_test(&net->count)) 214 __put_net(net); 215 } 216 217 static inline 218 int net_eq(const struct net *net1, const struct net *net2) 219 { 220 return net1 == net2; 221 } 222 223 void net_drop_ns(void *); 224 225 #else 226 227 static inline struct net *get_net(struct net *net) 228 { 229 return net; 230 } 231 232 static inline void put_net(struct net *net) 233 { 234 } 235 236 static inline struct net *maybe_get_net(struct net *net) 237 { 238 return net; 239 } 240 241 static inline 242 int net_eq(const struct net *net1, const struct net *net2) 243 { 244 return 1; 245 } 246 247 #define net_drop_ns NULL 248 #endif 249 250 251 typedef struct { 252 #ifdef CONFIG_NET_NS 253 struct net *net; 254 #endif 255 } possible_net_t; 256 257 static inline void write_pnet(possible_net_t *pnet, struct net *net) 258 { 259 #ifdef CONFIG_NET_NS 260 pnet->net = net; 261 #endif 262 } 263 264 static inline struct net *read_pnet(const possible_net_t *pnet) 265 { 266 #ifdef CONFIG_NET_NS 267 return pnet->net; 268 #else 269 return &init_net; 270 #endif 271 } 272 273 #define for_each_net(VAR) \ 274 list_for_each_entry(VAR, &net_namespace_list, list) 275 276 #define for_each_net_rcu(VAR) \ 277 list_for_each_entry_rcu(VAR, &net_namespace_list, list) 278 279 #ifdef CONFIG_NET_NS 280 #define __net_init 281 #define __net_exit 282 #define __net_initdata 283 #define __net_initconst 284 #else 285 #define __net_init __init 286 #define __net_exit __ref 287 #define __net_initdata __initdata 288 #define __net_initconst __initconst 289 #endif 290 291 int peernet2id_alloc(struct net *net, struct net *peer); 292 int peernet2id(struct net *net, struct net *peer); 293 bool peernet_has_id(struct net *net, struct net *peer); 294 struct net *get_net_ns_by_id(struct net *net, int id); 295 296 struct pernet_operations { 297 struct list_head list; 298 int (*init)(struct net *net); 299 void (*exit)(struct net *net); 300 void (*exit_batch)(struct list_head *net_exit_list); 301 unsigned int *id; 302 size_t size; 303 }; 304 305 /* 306 * Use these carefully. If you implement a network device and it 307 * needs per network namespace operations use device pernet operations, 308 * otherwise use pernet subsys operations. 309 * 310 * Network interfaces need to be removed from a dying netns _before_ 311 * subsys notifiers can be called, as most of the network code cleanup 312 * (which is done from subsys notifiers) runs with the assumption that 313 * dev_remove_pack has been called so no new packets will arrive during 314 * and after the cleanup functions have been called. dev_remove_pack 315 * is not per namespace so instead the guarantee of no more packets 316 * arriving in a network namespace is provided by ensuring that all 317 * network devices and all sockets have left the network namespace 318 * before the cleanup methods are called. 319 * 320 * For the longest time the ipv4 icmp code was registered as a pernet 321 * device which caused kernel oops, and panics during network 322 * namespace cleanup. So please don't get this wrong. 323 */ 324 int register_pernet_subsys(struct pernet_operations *); 325 void unregister_pernet_subsys(struct pernet_operations *); 326 int register_pernet_device(struct pernet_operations *); 327 void unregister_pernet_device(struct pernet_operations *); 328 329 struct ctl_table; 330 struct ctl_table_header; 331 332 #ifdef CONFIG_SYSCTL 333 int net_sysctl_init(void); 334 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 335 struct ctl_table *table); 336 void unregister_net_sysctl_table(struct ctl_table_header *header); 337 #else 338 static inline int net_sysctl_init(void) { return 0; } 339 static inline struct ctl_table_header *register_net_sysctl(struct net *net, 340 const char *path, struct ctl_table *table) 341 { 342 return NULL; 343 } 344 static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 345 { 346 } 347 #endif 348 349 static inline int rt_genid_ipv4(struct net *net) 350 { 351 return atomic_read(&net->ipv4.rt_genid); 352 } 353 354 static inline void rt_genid_bump_ipv4(struct net *net) 355 { 356 atomic_inc(&net->ipv4.rt_genid); 357 } 358 359 extern void (*__fib6_flush_trees)(struct net *net); 360 static inline void rt_genid_bump_ipv6(struct net *net) 361 { 362 if (__fib6_flush_trees) 363 __fib6_flush_trees(net); 364 } 365 366 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 367 static inline struct netns_ieee802154_lowpan * 368 net_ieee802154_lowpan(struct net *net) 369 { 370 return &net->ieee802154_lowpan; 371 } 372 #endif 373 374 /* For callers who don't really care about whether it's IPv4 or IPv6 */ 375 static inline void rt_genid_bump_all(struct net *net) 376 { 377 rt_genid_bump_ipv4(net); 378 rt_genid_bump_ipv6(net); 379 } 380 381 static inline int fnhe_genid(struct net *net) 382 { 383 return atomic_read(&net->fnhe_genid); 384 } 385 386 static inline void fnhe_genid_bump(struct net *net) 387 { 388 atomic_inc(&net->fnhe_genid); 389 } 390 391 #endif /* __NET_NET_NAMESPACE_H */ 392