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