linux/include/net/net_namespace.h
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   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/netns/core.h>
  13#include <net/netns/mib.h>
  14#include <net/netns/unix.h>
  15#include <net/netns/packet.h>
  16#include <net/netns/ipv4.h>
  17#include <net/netns/ipv6.h>
  18#include <net/netns/dccp.h>
  19#include <net/netns/x_tables.h>
  20#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  21#include <net/netns/conntrack.h>
  22#endif
  23#include <net/netns/xfrm.h>
  24
  25struct proc_dir_entry;
  26struct net_device;
  27struct sock;
  28struct ctl_table_header;
  29struct net_generic;
  30struct sock;
  31struct netns_ipvs;
  32
  33
  34#define NETDEV_HASHBITS    8
  35#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
  36
  37struct net {
  38        atomic_t                passive;        /* To decided when the network
  39                                                 * namespace should be freed.
  40                                                 */
  41        atomic_t                count;          /* To decided when the network
  42                                                 *  namespace should be shut down.
  43                                                 */
  44#ifdef NETNS_REFCNT_DEBUG
  45        atomic_t                use_count;      /* To track references we
  46                                                 * destroy on demand
  47                                                 */
  48#endif
  49        spinlock_t              rules_mod_lock;
  50
  51        struct list_head        list;           /* list of network namespaces */
  52        struct list_head        cleanup_list;   /* namespaces on death row */
  53        struct list_head        exit_list;      /* Use only net_mutex */
  54
  55        struct proc_dir_entry   *proc_net;
  56        struct proc_dir_entry   *proc_net_stat;
  57
  58#ifdef CONFIG_SYSCTL
  59        struct ctl_table_set    sysctls;
  60#endif
  61
  62        struct sock             *rtnl;                  /* rtnetlink socket */
  63        struct sock             *genl_sock;
  64
  65        struct list_head        dev_base_head;
  66        struct hlist_head       *dev_name_head;
  67        struct hlist_head       *dev_index_head;
  68        unsigned int            dev_base_seq;   /* protected by rtnl_mutex */
  69
  70        /* core fib_rules */
  71        struct list_head        rules_ops;
  72
  73
  74        struct net_device       *loopback_dev;          /* The loopback */
  75        struct netns_core       core;
  76        struct netns_mib        mib;
  77        struct netns_packet     packet;
  78        struct netns_unix       unx;
  79        struct netns_ipv4       ipv4;
  80#if IS_ENABLED(CONFIG_IPV6)
  81        struct netns_ipv6       ipv6;
  82#endif
  83#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
  84        struct netns_dccp       dccp;
  85#endif
  86#ifdef CONFIG_NETFILTER
  87        struct netns_xt         xt;
  88#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  89        struct netns_ct         ct;
  90#endif
  91        struct sock             *nfnl;
  92        struct sock             *nfnl_stash;
  93#endif
  94#ifdef CONFIG_WEXT_CORE
  95        struct sk_buff_head     wext_nlevents;
  96#endif
  97        struct net_generic __rcu        *gen;
  98
  99        /* Note : following structs are cache line aligned */
 100#ifdef CONFIG_XFRM
 101        struct netns_xfrm       xfrm;
 102#endif
 103        struct netns_ipvs       *ipvs;
 104        struct sock             *diag_nlsk;
 105        atomic_t                rt_genid;
 106};
 107
 108
 109#include <linux/seq_file_net.h>
 110
 111/* Init's network namespace */
 112extern struct net init_net;
 113
 114#ifdef CONFIG_NET
 115extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
 116
 117#else /* CONFIG_NET */
 118static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
 119{
 120        /* There is nothing to copy so this is a noop */
 121        return net_ns;
 122}
 123#endif /* CONFIG_NET */
 124
 125
 126extern struct list_head net_namespace_list;
 127
 128extern struct net *get_net_ns_by_pid(pid_t pid);
 129extern struct net *get_net_ns_by_fd(int pid);
 130
 131#ifdef CONFIG_NET_NS
 132extern void __put_net(struct net *net);
 133
 134static inline struct net *get_net(struct net *net)
 135{
 136        atomic_inc(&net->count);
 137        return net;
 138}
 139
 140static inline struct net *maybe_get_net(struct net *net)
 141{
 142        /* Used when we know struct net exists but we
 143         * aren't guaranteed a previous reference count
 144         * exists.  If the reference count is zero this
 145         * function fails and returns NULL.
 146         */
 147        if (!atomic_inc_not_zero(&net->count))
 148                net = NULL;
 149        return net;
 150}
 151
 152static inline void put_net(struct net *net)
 153{
 154        if (atomic_dec_and_test(&net->count))
 155                __put_net(net);
 156}
 157
 158static inline
 159int net_eq(const struct net *net1, const struct net *net2)
 160{
 161        return net1 == net2;
 162}
 163
 164extern void net_drop_ns(void *);
 165
 166#else
 167
 168static inline struct net *get_net(struct net *net)
 169{
 170        return net;
 171}
 172
 173static inline void put_net(struct net *net)
 174{
 175}
 176
 177static inline struct net *maybe_get_net(struct net *net)
 178{
 179        return net;
 180}
 181
 182static inline
 183int net_eq(const struct net *net1, const struct net *net2)
 184{
 185        return 1;
 186}
 187
 188#define net_drop_ns NULL
 189#endif
 190
 191
 192#ifdef NETNS_REFCNT_DEBUG
 193static inline struct net *hold_net(struct net *net)
 194{
 195        if (net)
 196                atomic_inc(&net->use_count);
 197        return net;
 198}
 199
 200static inline void release_net(struct net *net)
 201{
 202        if (net)
 203                atomic_dec(&net->use_count);
 204}
 205#else
 206static inline struct net *hold_net(struct net *net)
 207{
 208        return net;
 209}
 210
 211static inline void release_net(struct net *net)
 212{
 213}
 214#endif
 215
 216#ifdef CONFIG_NET_NS
 217
 218static inline void write_pnet(struct net **pnet, struct net *net)
 219{
 220        *pnet = net;
 221}
 222
 223static inline struct net *read_pnet(struct net * const *pnet)
 224{
 225        return *pnet;
 226}
 227
 228#else
 229
 230#define write_pnet(pnet, net)   do { (void)(net);} while (0)
 231#define read_pnet(pnet)         (&init_net)
 232
 233#endif
 234
 235#define for_each_net(VAR)                               \
 236        list_for_each_entry(VAR, &net_namespace_list, list)
 237
 238#define for_each_net_rcu(VAR)                           \
 239        list_for_each_entry_rcu(VAR, &net_namespace_list, list)
 240
 241#ifdef CONFIG_NET_NS
 242#define __net_init
 243#define __net_exit
 244#define __net_initdata
 245#else
 246#define __net_init      __init
 247#define __net_exit      __exit_refok
 248#define __net_initdata  __initdata
 249#endif
 250
 251struct pernet_operations {
 252        struct list_head list;
 253        int (*init)(struct net *net);
 254        void (*exit)(struct net *net);
 255        void (*exit_batch)(struct list_head *net_exit_list);
 256        int *id;
 257        size_t size;
 258};
 259
 260/*
 261 * Use these carefully.  If you implement a network device and it
 262 * needs per network namespace operations use device pernet operations,
 263 * otherwise use pernet subsys operations.
 264 *
 265 * Network interfaces need to be removed from a dying netns _before_
 266 * subsys notifiers can be called, as most of the network code cleanup
 267 * (which is done from subsys notifiers) runs with the assumption that
 268 * dev_remove_pack has been called so no new packets will arrive during
 269 * and after the cleanup functions have been called.  dev_remove_pack
 270 * is not per namespace so instead the guarantee of no more packets
 271 * arriving in a network namespace is provided by ensuring that all
 272 * network devices and all sockets have left the network namespace
 273 * before the cleanup methods are called.
 274 *
 275 * For the longest time the ipv4 icmp code was registered as a pernet
 276 * device which caused kernel oops, and panics during network
 277 * namespace cleanup.   So please don't get this wrong.
 278 */
 279extern int register_pernet_subsys(struct pernet_operations *);
 280extern void unregister_pernet_subsys(struct pernet_operations *);
 281extern int register_pernet_device(struct pernet_operations *);
 282extern void unregister_pernet_device(struct pernet_operations *);
 283
 284struct ctl_table;
 285struct ctl_table_header;
 286
 287#ifdef CONFIG_SYSCTL
 288extern int net_sysctl_init(void);
 289extern struct ctl_table_header *register_net_sysctl(struct net *net,
 290        const char *path, struct ctl_table *table);
 291extern void unregister_net_sysctl_table(struct ctl_table_header *header);
 292#else
 293static inline int net_sysctl_init(void) { return 0; }
 294static inline struct ctl_table_header *register_net_sysctl(struct net *net,
 295        const char *path, struct ctl_table *table)
 296{
 297        return NULL;
 298}
 299static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
 300{
 301}
 302#endif
 303
 304static inline int rt_genid(struct net *net)
 305{
 306        return atomic_read(&net->rt_genid);
 307}
 308
 309static inline void rt_genid_bump(struct net *net)
 310{
 311        atomic_inc(&net->rt_genid);
 312}
 313
 314#endif /* __NET_NET_NAMESPACE_H */
 315
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