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 #endif 125 #ifdef CONFIG_WEXT_CORE 126 struct sk_buff_head wext_nlevents; 127 #endif 128 struct net_generic __rcu *gen; 129 130 /* Note : following structs are cache line aligned */ 131 #ifdef CONFIG_XFRM 132 struct netns_xfrm xfrm; 133 #endif 134 #if IS_ENABLED(CONFIG_IP_VS) 135 struct netns_ipvs *ipvs; 136 #endif 137 #if IS_ENABLED(CONFIG_MPLS) 138 struct netns_mpls mpls; 139 #endif 140 struct sock *diag_nlsk; 141 atomic_t fnhe_genid; 142 }; 143 144 #include <linux/seq_file_net.h> 145 146 /* Init's network namespace */ 147 extern struct net init_net; 148 149 #ifdef CONFIG_NET_NS 150 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 151 struct net *old_net); 152 153 #else /* CONFIG_NET_NS */ 154 #include <linux/sched.h> 155 #include <linux/nsproxy.h> 156 static inline struct net *copy_net_ns(unsigned long flags, 157 struct user_namespace *user_ns, struct net *old_net) 158 { 159 if (flags & CLONE_NEWNET) 160 return ERR_PTR(-EINVAL); 161 return old_net; 162 } 163 #endif /* CONFIG_NET_NS */ 164 165 166 extern struct list_head net_namespace_list; 167 168 struct net *get_net_ns_by_pid(pid_t pid); 169 struct net *get_net_ns_by_fd(int pid); 170 171 #ifdef CONFIG_SYSCTL 172 void ipx_register_sysctl(void); 173 void ipx_unregister_sysctl(void); 174 #else 175 #define ipx_register_sysctl() 176 #define ipx_unregister_sysctl() 177 #endif 178 179 #ifdef CONFIG_NET_NS 180 void __put_net(struct net *net); 181 182 static inline struct net *get_net(struct net *net) 183 { 184 atomic_inc(&net->count); 185 return net; 186 } 187 188 static inline struct net *maybe_get_net(struct net *net) 189 { 190 /* Used when we know struct net exists but we 191 * aren't guaranteed a previous reference count 192 * exists. If the reference count is zero this 193 * function fails and returns NULL. 194 */ 195 if (!atomic_inc_not_zero(&net->count)) 196 net = NULL; 197 return net; 198 } 199 200 static inline void put_net(struct net *net) 201 { 202 if (atomic_dec_and_test(&net->count)) 203 __put_net(net); 204 } 205 206 static inline 207 int net_eq(const struct net *net1, const struct net *net2) 208 { 209 return net1 == net2; 210 } 211 212 void net_drop_ns(void *); 213 214 #else 215 216 static inline struct net *get_net(struct net *net) 217 { 218 return net; 219 } 220 221 static inline void put_net(struct net *net) 222 { 223 } 224 225 static inline struct net *maybe_get_net(struct net *net) 226 { 227 return net; 228 } 229 230 static inline 231 int net_eq(const struct net *net1, const struct net *net2) 232 { 233 return 1; 234 } 235 236 #define net_drop_ns NULL 237 #endif 238 239 240 typedef struct { 241 #ifdef CONFIG_NET_NS 242 struct net *net; 243 #endif 244 } possible_net_t; 245 246 static inline void write_pnet(possible_net_t *pnet, struct net *net) 247 { 248 #ifdef CONFIG_NET_NS 249 pnet->net = net; 250 #endif 251 } 252 253 static inline struct net *read_pnet(const possible_net_t *pnet) 254 { 255 #ifdef CONFIG_NET_NS 256 return pnet->net; 257 #else 258 return &init_net; 259 #endif 260 } 261 262 #define for_each_net(VAR) \ 263 list_for_each_entry(VAR, &net_namespace_list, list) 264 265 #define for_each_net_rcu(VAR) \ 266 list_for_each_entry_rcu(VAR, &net_namespace_list, list) 267 268 #ifdef CONFIG_NET_NS 269 #define __net_init 270 #define __net_exit 271 #define __net_initdata 272 #define __net_initconst 273 #else 274 #define __net_init __init 275 #define __net_exit __exit_refok 276 #define __net_initdata __initdata 277 #define __net_initconst __initconst 278 #endif 279 280 int peernet2id_alloc(struct net *net, struct net *peer); 281 int peernet2id(struct net *net, struct net *peer); 282 bool peernet_has_id(struct net *net, struct net *peer); 283 struct net *get_net_ns_by_id(struct net *net, int id); 284 285 struct pernet_operations { 286 struct list_head list; 287 int (*init)(struct net *net); 288 void (*exit)(struct net *net); 289 void (*exit_batch)(struct list_head *net_exit_list); 290 int *id; 291 size_t size; 292 }; 293 294 /* 295 * Use these carefully. If you implement a network device and it 296 * needs per network namespace operations use device pernet operations, 297 * otherwise use pernet subsys operations. 298 * 299 * Network interfaces need to be removed from a dying netns _before_ 300 * subsys notifiers can be called, as most of the network code cleanup 301 * (which is done from subsys notifiers) runs with the assumption that 302 * dev_remove_pack has been called so no new packets will arrive during 303 * and after the cleanup functions have been called. dev_remove_pack 304 * is not per namespace so instead the guarantee of no more packets 305 * arriving in a network namespace is provided by ensuring that all 306 * network devices and all sockets have left the network namespace 307 * before the cleanup methods are called. 308 * 309 * For the longest time the ipv4 icmp code was registered as a pernet 310 * device which caused kernel oops, and panics during network 311 * namespace cleanup. So please don't get this wrong. 312 */ 313 int register_pernet_subsys(struct pernet_operations *); 314 void unregister_pernet_subsys(struct pernet_operations *); 315 int register_pernet_device(struct pernet_operations *); 316 void unregister_pernet_device(struct pernet_operations *); 317 318 struct ctl_table; 319 struct ctl_table_header; 320 321 #ifdef CONFIG_SYSCTL 322 int net_sysctl_init(void); 323 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 324 struct ctl_table *table); 325 void unregister_net_sysctl_table(struct ctl_table_header *header); 326 #else 327 static inline int net_sysctl_init(void) { return 0; } 328 static inline struct ctl_table_header *register_net_sysctl(struct net *net, 329 const char *path, struct ctl_table *table) 330 { 331 return NULL; 332 } 333 static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 334 { 335 } 336 #endif 337 338 static inline int rt_genid_ipv4(struct net *net) 339 { 340 return atomic_read(&net->ipv4.rt_genid); 341 } 342 343 static inline void rt_genid_bump_ipv4(struct net *net) 344 { 345 atomic_inc(&net->ipv4.rt_genid); 346 } 347 348 extern void (*__fib6_flush_trees)(struct net *net); 349 static inline void rt_genid_bump_ipv6(struct net *net) 350 { 351 if (__fib6_flush_trees) 352 __fib6_flush_trees(net); 353 } 354 355 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 356 static inline struct netns_ieee802154_lowpan * 357 net_ieee802154_lowpan(struct net *net) 358 { 359 return &net->ieee802154_lowpan; 360 } 361 #endif 362 363 /* For callers who don't really care about whether it's IPv4 or IPv6 */ 364 static inline void rt_genid_bump_all(struct net *net) 365 { 366 rt_genid_bump_ipv4(net); 367 rt_genid_bump_ipv6(net); 368 } 369 370 static inline int fnhe_genid(struct net *net) 371 { 372 return atomic_read(&net->fnhe_genid); 373 } 374 375 static inline void fnhe_genid_bump(struct net *net) 376 { 377 atomic_inc(&net->fnhe_genid); 378 } 379 380 #endif /* __NET_NET_NAMESPACE_H */ 381