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