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 #else /* CONFIG_NET_NS */ 162 #include <linux/sched.h> 163 #include <linux/nsproxy.h> 164 static inline struct net *copy_net_ns(unsigned long flags, 165 struct user_namespace *user_ns, struct net *old_net) 166 { 167 if (flags & CLONE_NEWNET) 168 return ERR_PTR(-EINVAL); 169 return old_net; 170 } 171 #endif /* CONFIG_NET_NS */ 172 173 174 extern struct list_head net_namespace_list; 175 176 struct net *get_net_ns_by_pid(pid_t pid); 177 struct net *get_net_ns_by_fd(int fd); 178 179 #ifdef CONFIG_SYSCTL 180 void ipx_register_sysctl(void); 181 void ipx_unregister_sysctl(void); 182 #else 183 #define ipx_register_sysctl() 184 #define ipx_unregister_sysctl() 185 #endif 186 187 #ifdef CONFIG_NET_NS 188 void __put_net(struct net *net); 189 190 static inline struct net *get_net(struct net *net) 191 { 192 atomic_inc(&net->count); 193 return net; 194 } 195 196 static inline struct net *maybe_get_net(struct net *net) 197 { 198 /* Used when we know struct net exists but we 199 * aren't guaranteed a previous reference count 200 * exists. If the reference count is zero this 201 * function fails and returns NULL. 202 */ 203 if (!atomic_inc_not_zero(&net->count)) 204 net = NULL; 205 return net; 206 } 207 208 static inline void put_net(struct net *net) 209 { 210 if (atomic_dec_and_test(&net->count)) 211 __put_net(net); 212 } 213 214 static inline 215 int net_eq(const struct net *net1, const struct net *net2) 216 { 217 return net1 == net2; 218 } 219 220 void net_drop_ns(void *); 221 222 #else 223 224 static inline struct net *get_net(struct net *net) 225 { 226 return net; 227 } 228 229 static inline void put_net(struct net *net) 230 { 231 } 232 233 static inline struct net *maybe_get_net(struct net *net) 234 { 235 return net; 236 } 237 238 static inline 239 int net_eq(const struct net *net1, const struct net *net2) 240 { 241 return 1; 242 } 243 244 #define net_drop_ns NULL 245 #endif 246 247 248 typedef struct { 249 #ifdef CONFIG_NET_NS 250 struct net *net; 251 #endif 252 } possible_net_t; 253 254 static inline void write_pnet(possible_net_t *pnet, struct net *net) 255 { 256 #ifdef CONFIG_NET_NS 257 pnet->net = net; 258 #endif 259 } 260 261 static inline struct net *read_pnet(const possible_net_t *pnet) 262 { 263 #ifdef CONFIG_NET_NS 264 return pnet->net; 265 #else 266 return &init_net; 267 #endif 268 } 269 270 #define for_each_net(VAR) \ 271 list_for_each_entry(VAR, &net_namespace_list, list) 272 273 #define for_each_net_rcu(VAR) \ 274 list_for_each_entry_rcu(VAR, &net_namespace_list, list) 275 276 #ifdef CONFIG_NET_NS 277 #define __net_init 278 #define __net_exit 279 #define __net_initdata 280 #define __net_initconst 281 #else 282 #define __net_init __init 283 #define __net_exit __ref 284 #define __net_initdata __initdata 285 #define __net_initconst __initconst 286 #endif 287 288 int peernet2id_alloc(struct net *net, struct net *peer); 289 int peernet2id(struct net *net, struct net *peer); 290 bool peernet_has_id(struct net *net, struct net *peer); 291 struct net *get_net_ns_by_id(struct net *net, int id); 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 unsigned 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