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 32struct user_namespace; 33struct proc_dir_entry; 34struct net_device; 35struct sock; 36struct ctl_table_header; 37struct net_generic; 38struct sock; 39struct netns_ipvs; 40 41 42#define NETDEV_HASHBITS 8 43#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) 44 45struct 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 */ 141extern struct net init_net; 142 143#ifdef CONFIG_NET_NS 144struct 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> 150static 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 160extern struct list_head net_namespace_list; 161 162struct net *get_net_ns_by_pid(pid_t pid); 163struct net *get_net_ns_by_fd(int pid); 164 165#ifdef CONFIG_SYSCTL 166void ipx_register_sysctl(void); 167void ipx_unregister_sysctl(void); 168#else 169#define ipx_register_sysctl() 170#define ipx_unregister_sysctl() 171#endif 172 173#ifdef CONFIG_NET_NS 174void __put_net(struct net *net); 175 176static inline struct net *get_net(struct net *net) 177{ 178 atomic_inc(&net->count); 179 return net; 180} 181 182static 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 194static inline void put_net(struct net *net) 195{ 196 if (atomic_dec_and_test(&net->count)) 197 __put_net(net); 198} 199 200static inline 201int net_eq(const struct net *net1, const struct net *net2) 202{ 203 return net1 == net2; 204} 205 206void net_drop_ns(void *); 207 208#else 209 210static inline struct net *get_net(struct net *net) 211{ 212 return net; 213} 214 215static inline void put_net(struct net *net) 216{ 217} 218 219static inline struct net *maybe_get_net(struct net *net) 220{ 221 return net; 222} 223 224static inline 225int 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 234typedef struct { 235#ifdef CONFIG_NET_NS 236 struct net *net; 237#endif 238} possible_net_t; 239 240static 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 247static 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 274int peernet2id(struct net *net, struct net *peer); 275struct net *get_net_ns_by_id(struct net *net, int id); 276 277struct 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 */ 305int register_pernet_subsys(struct pernet_operations *); 306void unregister_pernet_subsys(struct pernet_operations *); 307int register_pernet_device(struct pernet_operations *); 308void unregister_pernet_device(struct pernet_operations *); 309 310struct ctl_table; 311struct ctl_table_header; 312 313#ifdef CONFIG_SYSCTL 314int net_sysctl_init(void); 315struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, 316 struct ctl_table *table); 317void unregister_net_sysctl_table(struct ctl_table_header *header); 318#else 319static inline int net_sysctl_init(void) { return 0; } 320static inline struct ctl_table_header *register_net_sysctl(struct net *net, 321 const char *path, struct ctl_table *table) 322{ 323 return NULL; 324} 325static inline void unregister_net_sysctl_table(struct ctl_table_header *header) 326{ 327} 328#endif 329 330static inline int rt_genid_ipv4(struct net *net) 331{ 332 return atomic_read(&net->ipv4.rt_genid); 333} 334 335static inline void rt_genid_bump_ipv4(struct net *net) 336{ 337 atomic_inc(&net->ipv4.rt_genid); 338} 339 340extern void (*__fib6_flush_trees)(struct net *net); 341static 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) 348static inline struct netns_ieee802154_lowpan * 349net_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 */ 356static inline void rt_genid_bump_all(struct net *net) 357{ 358 rt_genid_bump_ipv4(net); 359 rt_genid_bump_ipv6(net); 360} 361 362static inline int fnhe_genid(struct net *net) 363{ 364 return atomic_read(&net->fnhe_genid); 365} 366 367static inline void fnhe_genid_bump(struct net *net) 368{ 369 atomic_inc(&net->fnhe_genid); 370} 371 372#endif /* __NET_NET_NAMESPACE_H */ 373