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/sctp.h>
  19#include <net/netns/dccp.h>
  20#include <net/netns/x_tables.h>
  21#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  22#include <net/netns/conntrack.h>
  23#endif
  24#include <net/netns/xfrm.h>
  25
  26struct proc_dir_entry;
  27struct net_device;
  28struct sock;
  29struct ctl_table_header;
  30struct net_generic;
  31struct sock;
  32struct netns_ipvs;
  33
  34
  35#define NETDEV_HASHBITS    8
  36#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
  37
  38struct net {
  39        atomic_t                passive;        /* To decided when the network
  40                                                 * namespace should be freed.
  41                                                 */
  42        atomic_t                count;          /* To decided when the network
  43                                                 *  namespace should be shut down.
  44                                                 */
  45#ifdef NETNS_REFCNT_DEBUG
  46        atomic_t                use_count;      /* To track references we
  47                                                 * destroy on demand
  48                                                 */
  49#endif
  50        spinlock_t              rules_mod_lock;
  51
  52        struct list_head        list;           /* list of network namespaces */
  53        struct list_head        cleanup_list;   /* namespaces on death row */
  54        struct list_head        exit_list;      /* Use only net_mutex */
  55
  56        struct proc_dir_entry   *proc_net;
  57        struct proc_dir_entry   *proc_net_stat;
  58
  59#ifdef CONFIG_SYSCTL
  60        struct ctl_table_set    sysctls;
  61#endif
  62
  63        struct sock             *rtnl;                  /* rtnetlink socket */
  64        struct sock             *genl_sock;
  65
  66        struct list_head        dev_base_head;
  67        struct hlist_head       *dev_name_head;
  68        struct hlist_head       *dev_index_head;
  69        unsigned int            dev_base_seq;   /* protected by rtnl_mutex */
  70        int                     ifindex;
  71
  72        /* core fib_rules */
  73        struct list_head        rules_ops;
  74
  75
  76        struct net_device       *loopback_dev;          /* The loopback */
  77        struct netns_core       core;
  78        struct netns_mib        mib;
  79        struct netns_packet     packet;
  80        struct netns_unix       unx;
  81        struct netns_ipv4       ipv4;
  82#if IS_ENABLED(CONFIG_IPV6)
  83        struct netns_ipv6       ipv6;
  84#endif
  85#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
  86        struct netns_sctp       sctp;
  87#endif
  88#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
  89        struct netns_dccp       dccp;
  90#endif
  91#ifdef CONFIG_NETFILTER
  92        struct netns_xt         xt;
  93#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  94        struct netns_ct         ct;
  95#endif
  96#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
  97        struct netns_nf_frag    nf_frag;
  98#endif
  99        struct sock             *nfnl;
 100        struct sock             *nfnl_stash;
 101#endif
 102#ifdef CONFIG_WEXT_CORE
 103        struct sk_buff_head     wext_nlevents;
 104#endif
 105        struct net_generic __rcu        *gen;
 106
 107        /* Note : following structs are cache line aligned */
 108#ifdef CONFIG_XFRM
 109        struct netns_xfrm       xfrm;
 110#endif
 111        struct netns_ipvs       *ipvs;
 112        struct sock             *diag_nlsk;
 113        atomic_t                rt_genid;
 114};
 115
 116/*
 117 * ifindex generation is per-net namespace, and loopback is
 118 * always the 1st device in ns (see net_dev_init), thus any
 119 * loopback device should get ifindex 1
 120 */
 121
 122#define LOOPBACK_IFINDEX        1
 123
 124#include <linux/seq_file_net.h>
 125
 126/* Init's network namespace */
 127extern struct net init_net;
 128
 129#ifdef CONFIG_NET
 130extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
 131
 132#else /* CONFIG_NET */
 133static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
 134{
 135        /* There is nothing to copy so this is a noop */
 136        return net_ns;
 137}
 138#endif /* CONFIG_NET */
 139
 140
 141extern struct list_head net_namespace_list;
 142
 143extern struct net *get_net_ns_by_pid(pid_t pid);
 144extern struct net *get_net_ns_by_fd(int pid);
 145
 146#ifdef CONFIG_NET_NS
 147extern void __put_net(struct net *net);
 148
 149static inline struct net *get_net(struct net *net)
 150{
 151        atomic_inc(&net->count);
 152        return net;
 153}
 154
 155static inline struct net *maybe_get_net(struct net *net)
 156{
 157        /* Used when we know struct net exists but we
 158         * aren't guaranteed a previous reference count
 159         * exists.  If the reference count is zero this
 160         * function fails and returns NULL.
 161         */
 162        if (!atomic_inc_not_zero(&net->count))
 163                net = NULL;
 164        return net;
 165}
 166
 167static inline void put_net(struct net *net)
 168{
 169        if (atomic_dec_and_test(&net->count))
 170                __put_net(net);
 171}
 172
 173static inline
 174int net_eq(const struct net *net1, const struct net *net2)
 175{
 176        return net1 == net2;
 177}
 178
 179extern void net_drop_ns(void *);
 180
 181#else
 182
 183static inline struct net *get_net(struct net *net)
 184{
 185        return net;
 186}
 187
 188static inline void put_net(struct net *net)
 189{
 190}
 191
 192static inline struct net *maybe_get_net(struct net *net)
 193{
 194        return net;
 195}
 196
 197static inline
 198int net_eq(const struct net *net1, const struct net *net2)
 199{
 200        return 1;
 201}
 202
 203#define net_drop_ns NULL
 204#endif
 205
 206
 207#ifdef NETNS_REFCNT_DEBUG
 208static inline struct net *hold_net(struct net *net)
 209{
 210        if (net)
 211                atomic_inc(&net->use_count);
 212        return net;
 213}
 214
 215static inline void release_net(struct net *net)
 216{
 217        if (net)
 218                atomic_dec(&net->use_count);
 219}
 220#else
 221static inline struct net *hold_net(struct net *net)
 222{
 223        return net;
 224}
 225
 226static inline void release_net(struct net *net)
 227{
 228}
 229#endif
 230
 231#ifdef CONFIG_NET_NS
 232
 233static inline void write_pnet(struct net **pnet, struct net *net)
 234{
 235        *pnet = net;
 236}
 237
 238static inline struct net *read_pnet(struct net * const *pnet)
 239{
 240        return *pnet;
 241}
 242
 243#else
 244
 245#define write_pnet(pnet, net)   do { (void)(net);} while (0)
 246#define read_pnet(pnet)         (&init_net)
 247
 248#endif
 249
 250#define for_each_net(VAR)                               \
 251        list_for_each_entry(VAR, &net_namespace_list, list)
 252
 253#define for_each_net_rcu(VAR)                           \
 254        list_for_each_entry_rcu(VAR, &net_namespace_list, list)
 255
 256#ifdef CONFIG_NET_NS
 257#define __net_init
 258#define __net_exit
 259#define __net_initdata
 260#define __net_initconst
 261#else
 262#define __net_init      __init
 263#define __net_exit      __exit_refok
 264#define __net_initdata  __initdata
 265#define __net_initconst __initconst
 266#endif
 267
 268struct pernet_operations {
 269        struct list_head list;
 270        int (*init)(struct net *net);
 271        void (*exit)(struct net *net);
 272        void (*exit_batch)(struct list_head *net_exit_list);
 273        int *id;
 274        size_t size;
 275};
 276
 277/*
 278 * Use these carefully.  If you implement a network device and it
 279 * needs per network namespace operations use device pernet operations,
 280 * otherwise use pernet subsys operations.
 281 *
 282 * Network interfaces need to be removed from a dying netns _before_
 283 * subsys notifiers can be called, as most of the network code cleanup
 284 * (which is done from subsys notifiers) runs with the assumption that
 285 * dev_remove_pack has been called so no new packets will arrive during
 286 * and after the cleanup functions have been called.  dev_remove_pack
 287 * is not per namespace so instead the guarantee of no more packets
 288 * arriving in a network namespace is provided by ensuring that all
 289 * network devices and all sockets have left the network namespace
 290 * before the cleanup methods are called.
 291 *
 292 * For the longest time the ipv4 icmp code was registered as a pernet
 293 * device which caused kernel oops, and panics during network
 294 * namespace cleanup.   So please don't get this wrong.
 295 */
 296extern int register_pernet_subsys(struct pernet_operations *);
 297extern void unregister_pernet_subsys(struct pernet_operations *);
 298extern int register_pernet_device(struct pernet_operations *);
 299extern void unregister_pernet_device(struct pernet_operations *);
 300
 301struct ctl_table;
 302struct ctl_table_header;
 303
 304#ifdef CONFIG_SYSCTL
 305extern int net_sysctl_init(void);
 306extern struct ctl_table_header *register_net_sysctl(struct net *net,
 307        const char *path, struct ctl_table *table);
 308extern void unregister_net_sysctl_table(struct ctl_table_header *header);
 309#else
 310static inline int net_sysctl_init(void) { return 0; }
 311static inline struct ctl_table_header *register_net_sysctl(struct net *net,
 312        const char *path, struct ctl_table *table)
 313{
 314        return NULL;
 315}
 316static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
 317{
 318}
 319#endif
 320
 321static inline int rt_genid(struct net *net)
 322{
 323        return atomic_read(&net->rt_genid);
 324}
 325
 326static inline void rt_genid_bump(struct net *net)
 327{
 328        atomic_inc(&net->rt_genid);
 329}
 330
 331#endif /* __NET_NET_NAMESPACE_H */
 332
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