include/net/net_namespace.h

   1 /*
   2  * Operations on the network namespace
   3  */
   4 #ifndef __NET_NET_NAMESPACE_H
   5 #define __NET_NET_NAMESPACE_H
   6
   7 #include <asm/atomic.h>
   8 #include <linux/workqueue.h>
   9 #include <linux/list.h>
  10
  11 #include <net/netns/unix.h>
  12 #include <net/netns/packet.h>
  13 #include <net/netns/ipv4.h>
  14 #include <net/netns/ipv6.h>
  15 #include <net/netns/x_tables.h>
  16
  17 struct proc_dir_entry;
  18 struct net_device;
  19 struct sock;
  20 struct ctl_table_header;
  21
  22 struct net {
  23         atomic_t                count;          /* To decided when the network
  24                                                  *  namespace should be freed.
  25                                                  */
  26         atomic_t                use_count;      /* To track references we
  27                                                  * destroy on demand
  28                                                  */
  29         struct list_head        list;           /* list of network namespaces */
  30         struct work_struct      work;           /* work struct for freeing */
  31
  32         struct proc_dir_entry   *proc_net;
  33         struct proc_dir_entry   *proc_net_stat;
  34 <<<<<<< HEAD:include/net/net_namespace.h
  35         struct proc_dir_entry   *proc_net_root;
  36 =======
  37 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:include/net/net_namespace.h
  38
  39         struct list_head        sysctl_table_headers;
  40
  41         struct net_device       *loopback_dev;          /* The loopback */
  42
  43         struct list_head        dev_base_head;
  44         struct hlist_head       *dev_name_head;
  45         struct hlist_head       *dev_index_head;
  46
  47         /* core fib_rules */
  48         struct list_head        rules_ops;
  49         spinlock_t              rules_mod_lock;
  50
  51         struct sock             *rtnl;                  /* rtnetlink socket */
  52
  53         /* core sysctls */
  54         struct ctl_table_header *sysctl_core_hdr;
  55         int                     sysctl_somaxconn;
  56
  57         struct netns_packet     packet;
  58         struct netns_unix       unx;
  59         struct netns_ipv4       ipv4;
  60 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  61         struct netns_ipv6       ipv6;
  62 #endif
  63 #ifdef CONFIG_NETFILTER
  64         struct netns_xt         xt;
  65 #endif
  66 };
  67
  68 #ifdef CONFIG_NET
  69 /* Init's network namespace */
  70 extern struct net init_net;
  71 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
  72 #else
  73 #define INIT_NET_NS(net_ns)
  74 #endif
  75
  76 extern struct list_head net_namespace_list;
  77
  78 #ifdef CONFIG_NET
  79 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
  80 #else
  81 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
  82 {
  83         /* There is nothing to copy so this is a noop */
  84         return net_ns;
  85 }
  86 #endif
  87
  88 #ifdef CONFIG_NET_NS
  89 extern void __put_net(struct net *net);
  90
  91 static inline struct net *get_net(struct net *net)
  92 {
  93         atomic_inc(&net->count);
  94         return net;
  95 }
  96
  97 static inline struct net *maybe_get_net(struct net *net)
  98 {
  99         /* Used when we know struct net exists but we
 100          * aren't guaranteed a previous reference count
 101          * exists.  If the reference count is zero this
 102          * function fails and returns NULL.
 103          */
 104         if (!atomic_inc_not_zero(&net->count))
 105                 net = NULL;
 106         return net;
 107 }
 108
 109 static inline void put_net(struct net *net)
 110 {
 111         if (atomic_dec_and_test(&net->count))
 112                 __put_net(net);
 113 }
 114
 115 static inline struct net *hold_net(struct net *net)
 116 {
 117         atomic_inc(&net->use_count);
 118         return net;
 119 }
 120
 121 static inline void release_net(struct net *net)
 122 {
 123         atomic_dec(&net->use_count);
 124 }
 125 #else
 126 static inline struct net *get_net(struct net *net)
 127 {
 128         return net;
 129 }
 130
 131 static inline void put_net(struct net *net)
 132 {
 133 }
 134
 135 static inline struct net *hold_net(struct net *net)
 136 {
 137         return net;
 138 }
 139
 140 static inline void release_net(struct net *net)
 141 {
 142 }
 143
 144 static inline struct net *maybe_get_net(struct net *net)
 145 {
 146         return net;
 147 }
 148 #endif
 149
 150 #define for_each_net(VAR)                               \
 151         list_for_each_entry(VAR, &net_namespace_list, list)
 152
 153 #ifdef CONFIG_NET_NS
 154 #define __net_init
 155 #define __net_exit
 156 #define __net_initdata
 157 #else
 158 #define __net_init      __init
 159 #define __net_exit      __exit_refok
 160 #define __net_initdata  __initdata
 161 #endif
 162
 163 struct pernet_operations {
 164         struct list_head list;
 165         int (*init)(struct net *net);
 166         void (*exit)(struct net *net);
 167 };
 168
 169 extern int register_pernet_subsys(struct pernet_operations *);
 170 extern void unregister_pernet_subsys(struct pernet_operations *);
 171 extern int register_pernet_device(struct pernet_operations *);
 172 extern void unregister_pernet_device(struct pernet_operations *);
 173
 174 struct ctl_path;
 175 struct ctl_table;
 176 struct ctl_table_header;
 177 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
 178         const struct ctl_path *path, struct ctl_table *table);
 179 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
 180
 181 #endif /* __NET_NET_NAMESPACE_H */