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 32 struct user_namespace; 33 struct proc_dir_entry; 34 struct net_device; 35 struct sock; 36 struct ctl_table_header; 37 struct net_generic; 38 struct sock; 39 struct netns_ipvs; 40 41 42 #define NETDEV_HASHBITS 8 43 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 44 45 struct net { 46 atomic_t passive; /* To decided when the network 47 * namespace should be freed. 48 */ 49 atomic_t count; /* To decided when the network 50 * namespace should be shut down. 51 */ 52 spinlock_t rules_mod_lock; 53 54 atomic64_t cookie_gen; 55 56 struct list_head list; /* list of network namespaces */ 57 struct list_head cleanup_list; /* namespaces on death row */ 58 struct list_head exit_list; /* Use only net_mutex */ 59 60 struct user_namespace *user_ns; /* Owning user namespace */ 61 struct idr netns_ids; 62 63 struct ns_common ns; 64 65 struct proc_dir_entry *proc_net; 66 struct proc_dir_entry *proc_net_stat; 67 68 #ifdef CONFIG_SYSCTL 69 struct ctl_table_set sysctls; 70 #endif 71 72 struct sock *rtnl; /* rtnetlink socket */ 73 struct sock *genl_sock; 74 75 struct list_head dev_base_head; 76 struct hlist_head *dev_name_head; 77 struct hlist_head *dev_index_head; 78 unsigned int dev_base_seq; /* protected by rtnl_mutex */ 79 int ifindex; 80 unsigned int dev_unreg_count; 81 82 /* core fib_rules */ 83 struct list_head rules_ops; 84 85 86 struct net_device *loopback_dev; /* The loopback */ 87 struct netns_core core; 88 struct netns_mib mib; 89 struct netns_packet packet; 90 struct netns_unix unx; 91 struct netns_ipv4 ipv4; 92 #if IS_ENABLED(CONFIG_IPV6) 93 struct netns_ipv6 ipv6; 94 #endif 95 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 96 struct netns_ieee802154_lowpan ieee802154_lowpan; 97 #endif 98 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) 99 struct netns_sctp sctp; 100 #endif 101 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 102 struct netns_dccp dccp; 103 #endif 104 #ifdef CONFIG_NETFILTER 105 struct netns_nf nf; 106 struct netns_xt xt; 107 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 108 struct netns_ct ct; 109 #endif 110 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) 111 struct netns_nftables nft; 112 #endif 113 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 114 struct netns_nf_frag nf_frag; 115 #endif 116 struct sock *nfnl; 117 struct sock *nfnl_stash; 118 #endif 119 #ifdef CONFIG_WEXT_CORE 120 struct sk_buff_head wext_nlevents; 121 #endif 122 struct net_generic __rcu *gen; 123 124 /* Note : following structs are cache line aligned */ 125 #ifdef CONFIG_XFRM 126 struct netns_xfrm xfrm; 127 #endif 128 #if IS_ENABLED(CONFIG_IP_VS) 129 struct netns_ipvs *ipvs; 130 #endif 131 #if IS_ENABLED(CONFIG_MPLS) 132 struct netns_mpls mpls; 133 #endif 134 struct sock *diag_nlsk; 135 atomic_t fnhe_genid; 136 }; 137 138 #include <linux/seq_file_net.h> 139 140 /* Init's network namespace */ 141 extern struct net init_net; 142 143 #ifdef CONFIG_NET_NS 144 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, 145 struct net *old_net); 146 147 #else /* CONFIG_NET_NS */ 148 #include <linux/sched.h> 149 #include <linux/nsproxy.h> 150 static inline struct net *copy_net_ns(unsigned long flags, 151 struct user_namespace *user_ns, struct net *old_net) 152 { 153 if (flags & CLONE_NEWNET) 154 return ERR_PTR(-EINVAL); 155 return old_net; 156 } 157 #endif /* CONFIG_NET_NS */ 158 159 160 extern struct list_head net_namespace_list; 161 162 struct net *get_net_ns_by_pid(pid_t pid); 163 struct net *get_net_ns_by_fd(int pid); 164 165 #ifdef CONFIG_SYSCTL 166 void ipx_register_sysctl(void); 167 void ipx_unregister_sysctl(void); 168 #else 169 #define ipx_register_sysctl() 170 #define ipx_unregister_sysctl() 171 #endif 172 173 #ifdef CONFIG_NET_NS 174 void __put_net(struct net *net); 175 176 static inline struct net *get_net(struct net *net) 177 { 178 atomic_inc(&net->count); 179 return net; 180 } 181 182 static inline struct net *maybe_get_net(struct net *net) 183 { 184 /* Used when we know struct net exists but we 185 * aren't guaranteed a previous reference count 186 * exists. If the reference count is zero this 187 * function fails and returns NULL. 188 */ 189 if (!atomic_inc_not_zero(&net->count)) 190 net = NULL; 191 return net; 192 } 193 194 static inline void put_net(struct net *net) 195 { 196 if (atomic_dec_and_test(&net->count)) 197 __put_net(net); 198 } 199 200 static inline 201 int net_eq(const struct net *net1, const struct net *net2) 202 { 203 return net1 == net2; 204 } 205 206 void net_drop_ns(void *); 207 208 #else 209 210 static inline struct net *get_net(struct net *net) 211 { 212 return net; 213 } 214 215 static inline void put_net(struct net *net) 216 { 217 } 218 219 static inline struct net *maybe_get_net(struct net *net) 220 { 221 return net; 222 } 223 224 static inline 225 int net_eq(const struct net *net1, const struct net *net2) 226 { 227 return 1; 228 } 229 230 #define net_drop_ns NULL 231 #endif 232 233 234 typedef struct { 235 #ifdef CONFIG_NET_NS 236 struct net *net; 237 #endif 238 } possible_net_t; 239 240 static inline void write_pnet(possible_net_t *pnet, struct net *net) 241 { 242 #ifdef CONFIG_NET_NS 243 pnet->net = net; 244 #endif 245 } 246 247 static inline struct net *read_pnet(const possible_net_t *pnet) 248 { 249 #ifdef CONFIG_NET_NS 250 return pnet->net; 251 #else 252 return &init_net; 253 #endif 254 } 255 256 #define for_each_net(VAR) \ 257 list_for_each_entry(VAR, &net_namespace_list, list) 258 259 #define for_each_net_rcu(VAR) \ 260 list_for_each_entry_rcu(VAR, &net_namespace_list, list) 261 262 #ifdef CONFIG_NET_NS 263 #define __net_init 264 #define __net_exit 265 #define __net_initdata 266 #define __net_initconst 267 #else 268 #define __net_init __init 269 #define __net_exit __exit_refok 270 #define __net_initdata __initdata 271 #define __net_initconst __initconst 272 #endif 273 274 int peernet2id(struct net *net, struct net *peer); 275 struct net *get_net_ns_by_id(struct net *net, int id); 276 277 struct pernet_operations { 278 struct list_head list; 279 int (*init)(struct net *net); 280 void (*exit)(struct net *net); 281 void (*exit_batch)(struct list_head *net_exit_list); 282 int *id; 283 size_t size; 284 }; 285 286 /* 287 * Use these carefully. If you implement a network device and it 288 * needs per network namespace operations use device pernet operations, 289 * otherwise use pernet subsys operations. 290 * 291 * Network interfaces need to be removed from a dying netns _before_ 292 * subsys notifiers can be called, as most of the network code cleanup 293 * (which is done from subsys notifiers) runs with the assumption that 294 * dev_remove_pack has been called so no new packets will arrive during 295 * and after the cleanup functions have been called. dev_remove_pack 296 * is not per namespace so instead the guarantee of no more packets 297 * arriving in a network namespace is provided by ensuring that all 298 * network devices and all sockets have left the network namespace 299 * before the cleanup methods are called. 300 * 301 * For the longest time the ipv4 icmp code was registered as a pernet 302 * device which caused kernel oops, and panics during network 303 * namespace cleanup. So please don't get this wrong. 304 */ 305 int register_pernet_subsys(struct pernet_operations *); 306 void unregister_pernet_subsys(struct pernet_operations *); 307 int register_pernet_device(struct pernet_operations *); 308 void unregister_pernet_device(struct pernet_operations *); 309 310 struct ctl_table; 311 struct ctl_table_header; 312 313 #ifdef CONFIG_SYSCTL 314 int net_sysctl_init(void); 315 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 316 struct ctl_table *table); 317 void unregister_net_sysctl_table(struct ctl_table_header *header); 318 #else 319 static inline int net_sysctl_init(void) { return 0; } 320 static inline struct ctl_table_header *register_net_sysctl(struct net *net, 321 const char *path, struct ctl_table *table) 322 { 323 return NULL; 324 } 325 static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 326 { 327 } 328 #endif 329 330 static inline int rt_genid_ipv4(struct net *net) 331 { 332 return atomic_read(&net->ipv4.rt_genid); 333 } 334 335 static inline void rt_genid_bump_ipv4(struct net *net) 336 { 337 atomic_inc(&net->ipv4.rt_genid); 338 } 339 340 extern void (*__fib6_flush_trees)(struct net *net); 341 static inline void rt_genid_bump_ipv6(struct net *net) 342 { 343 if (__fib6_flush_trees) 344 __fib6_flush_trees(net); 345 } 346 347 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 348 static inline struct netns_ieee802154_lowpan * 349 net_ieee802154_lowpan(struct net *net) 350 { 351 return &net->ieee802154_lowpan; 352 } 353 #endif 354 355 /* For callers who don't really care about whether it's IPv4 or IPv6 */ 356 static inline void rt_genid_bump_all(struct net *net) 357 { 358 rt_genid_bump_ipv4(net); 359 rt_genid_bump_ipv6(net); 360 } 361 362 static inline int fnhe_genid(struct net *net) 363 { 364 return atomic_read(&net->fnhe_genid); 365 } 366 367 static inline void fnhe_genid_bump(struct net *net) 368 { 369 atomic_inc(&net->fnhe_genid); 370 } 371 372 #endif /* __NET_NET_NAMESPACE_H */ 373