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 #endif 122 #ifdef CONFIG_WEXT_CORE 123 struct sk_buff_head wext_nlevents; 124 #endif 125 struct net_generic __rcu *gen; 126 127 /* Note : following structs are cache line aligned */ 128 #ifdef CONFIG_XFRM 129 struct netns_xfrm xfrm; 130 #endif 131 #if IS_ENABLED(CONFIG_IP_VS) 132 struct netns_ipvs *ipvs; 133 #endif 134 #if IS_ENABLED(CONFIG_MPLS) 135 struct netns_mpls mpls; 136 #endif 137 struct sock *diag_nlsk; 138 atomic_t fnhe_genid; 139 }; 140 141 #include <linux/seq_file_net.h> 142 143 /* Init's network namespace */ 144 extern struct net init_net; 145 146 #ifdef CONFIG_NET_NS 147 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 148 struct net *old_net); 149 150 #else /* CONFIG_NET_NS */ 151 #include <linux/sched.h> 152 #include <linux/nsproxy.h> 153 static inline struct net *copy_net_ns(unsigned long flags, 154 struct user_namespace *user_ns, struct net *old_net) 155 { 156 if (flags & CLONE_NEWNET) 157 return ERR_PTR(-EINVAL); 158 return old_net; 159 } 160 #endif /* CONFIG_NET_NS */ 161 162 163 extern struct list_head net_namespace_list; 164 165 struct net *get_net_ns_by_pid(pid_t pid); 166 struct net *get_net_ns_by_fd(int pid); 167 168 #ifdef CONFIG_SYSCTL 169 void ipx_register_sysctl(void); 170 void ipx_unregister_sysctl(void); 171 #else 172 #define ipx_register_sysctl() 173 #define ipx_unregister_sysctl() 174 #endif 175 176 #ifdef CONFIG_NET_NS 177 void __put_net(struct net *net); 178 179 static inline struct net *get_net(struct net *net) 180 { 181 atomic_inc(&net->count); 182 return net; 183 } 184 185 static inline struct net *maybe_get_net(struct net *net) 186 { 187 /* Used when we know struct net exists but we 188 * aren't guaranteed a previous reference count 189 * exists. If the reference count is zero this 190 * function fails and returns NULL. 191 */ 192 if (!atomic_inc_not_zero(&net->count)) 193 net = NULL; 194 return net; 195 } 196 197 static inline void put_net(struct net *net) 198 { 199 if (atomic_dec_and_test(&net->count)) 200 __put_net(net); 201 } 202 203 static inline 204 int net_eq(const struct net *net1, const struct net *net2) 205 { 206 return net1 == net2; 207 } 208 209 void net_drop_ns(void *); 210 211 #else 212 213 static inline struct net *get_net(struct net *net) 214 { 215 return net; 216 } 217 218 static inline void put_net(struct net *net) 219 { 220 } 221 222 static inline struct net *maybe_get_net(struct net *net) 223 { 224 return net; 225 } 226 227 static inline 228 int net_eq(const struct net *net1, const struct net *net2) 229 { 230 return 1; 231 } 232 233 #define net_drop_ns NULL 234 #endif 235 236 237 typedef struct { 238 #ifdef CONFIG_NET_NS 239 struct net *net; 240 #endif 241 } possible_net_t; 242 243 static inline void write_pnet(possible_net_t *pnet, struct net *net) 244 { 245 #ifdef CONFIG_NET_NS 246 pnet->net = net; 247 #endif 248 } 249 250 static inline struct net *read_pnet(const possible_net_t *pnet) 251 { 252 #ifdef CONFIG_NET_NS 253 return pnet->net; 254 #else 255 return &init_net; 256 #endif 257 } 258 259 #define for_each_net(VAR) \ 260 list_for_each_entry(VAR, &net_namespace_list, list) 261 262 #define for_each_net_rcu(VAR) \ 263 list_for_each_entry_rcu(VAR, &net_namespace_list, list) 264 265 #ifdef CONFIG_NET_NS 266 #define __net_init 267 #define __net_exit 268 #define __net_initdata 269 #define __net_initconst 270 #else 271 #define __net_init __init 272 #define __net_exit __exit_refok 273 #define __net_initdata __initdata 274 #define __net_initconst __initconst 275 #endif 276 277 int peernet2id_alloc(struct net *net, struct net *peer); 278 int peernet2id(struct net *net, struct net *peer); 279 bool peernet_has_id(struct net *net, struct net *peer); 280 struct net *get_net_ns_by_id(struct net *net, int id); 281 282 struct pernet_operations { 283 struct list_head list; 284 int (*init)(struct net *net); 285 void (*exit)(struct net *net); 286 void (*exit_batch)(struct list_head *net_exit_list); 287 int *id; 288 size_t size; 289 }; 290 291 /* 292 * Use these carefully. If you implement a network device and it 293 * needs per network namespace operations use device pernet operations, 294 * otherwise use pernet subsys operations. 295 * 296 * Network interfaces need to be removed from a dying netns _before_ 297 * subsys notifiers can be called, as most of the network code cleanup 298 * (which is done from subsys notifiers) runs with the assumption that 299 * dev_remove_pack has been called so no new packets will arrive during 300 * and after the cleanup functions have been called. dev_remove_pack 301 * is not per namespace so instead the guarantee of no more packets 302 * arriving in a network namespace is provided by ensuring that all 303 * network devices and all sockets have left the network namespace 304 * before the cleanup methods are called. 305 * 306 * For the longest time the ipv4 icmp code was registered as a pernet 307 * device which caused kernel oops, and panics during network 308 * namespace cleanup. So please don't get this wrong. 309 */ 310 int register_pernet_subsys(struct pernet_operations *); 311 void unregister_pernet_subsys(struct pernet_operations *); 312 int register_pernet_device(struct pernet_operations *); 313 void unregister_pernet_device(struct pernet_operations *); 314 315 struct ctl_table; 316 struct ctl_table_header; 317 318 #ifdef CONFIG_SYSCTL 319 int net_sysctl_init(void); 320 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 321 struct ctl_table *table); 322 void unregister_net_sysctl_table(struct ctl_table_header *header); 323 #else 324 static inline int net_sysctl_init(void) { return 0; } 325 static inline struct ctl_table_header *register_net_sysctl(struct net *net, 326 const char *path, struct ctl_table *table) 327 { 328 return NULL; 329 } 330 static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 331 { 332 } 333 #endif 334 335 static inline int rt_genid_ipv4(struct net *net) 336 { 337 return atomic_read(&net->ipv4.rt_genid); 338 } 339 340 static inline void rt_genid_bump_ipv4(struct net *net) 341 { 342 atomic_inc(&net->ipv4.rt_genid); 343 } 344 345 extern void (*__fib6_flush_trees)(struct net *net); 346 static inline void rt_genid_bump_ipv6(struct net *net) 347 { 348 if (__fib6_flush_trees) 349 __fib6_flush_trees(net); 350 } 351 352 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 353 static inline struct netns_ieee802154_lowpan * 354 net_ieee802154_lowpan(struct net *net) 355 { 356 return &net->ieee802154_lowpan; 357 } 358 #endif 359 360 /* For callers who don't really care about whether it's IPv4 or IPv6 */ 361 static inline void rt_genid_bump_all(struct net *net) 362 { 363 rt_genid_bump_ipv4(net); 364 rt_genid_bump_ipv6(net); 365 } 366 367 static inline int fnhe_genid(struct net *net) 368 { 369 return atomic_read(&net->fnhe_genid); 370 } 371 372 static inline void fnhe_genid_bump(struct net *net) 373 { 374 atomic_inc(&net->fnhe_genid); 375 } 376 377 #endif /* __NET_NET_NAMESPACE_H */ 378