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/core.h>
  12 #include <net/netns/mib.h>
  13 #include <net/netns/unix.h>
  14 #include <net/netns/packet.h>
  15 #include <net/netns/ipv4.h>
  16 #include <net/netns/ipv6.h>
  17 #include <net/netns/dccp.h>
  18 #include <net/netns/x_tables.h>
  19 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  20 #include <net/netns/conntrack.h>
  21 #endif
  22
  23 struct proc_dir_entry;
  24 struct net_device;
  25 struct sock;
  26 struct ctl_table_header;
  27 struct net_generic;
  28
  29 struct net {
  30         atomic_t                count;          /* To decided when the network
  31                                                  *  namespace should be freed.
  32                                                  */
  33 #ifdef NETNS_REFCNT_DEBUG
  34         atomic_t                use_count;      /* To track references we
  35                                                  * destroy on demand
  36                                                  */
  37 #endif
  38         struct list_head        list;           /* list of network namespaces */
  39         struct work_struct      work;           /* work struct for freeing */
  40
  41         struct proc_dir_entry   *proc_net;
  42         struct proc_dir_entry   *proc_net_stat;
  43
  44 #ifdef CONFIG_SYSCTL
  45         struct ctl_table_set    sysctls;
  46 #endif
  47
  48         struct net_device       *loopback_dev;          /* The loopback */
  49
  50         struct list_head        dev_base_head;
  51         struct hlist_head       *dev_name_head;
  52         struct hlist_head       *dev_index_head;
  53
  54         /* core fib_rules */
  55         struct list_head        rules_ops;
  56         spinlock_t              rules_mod_lock;
  57
  58         struct sock             *rtnl;                  /* rtnetlink socket */
  59
  60         struct netns_core       core;
  61         struct netns_mib        mib;
  62         struct netns_packet     packet;
  63         struct netns_unix       unx;
  64         struct netns_ipv4       ipv4;
  65 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  66         struct netns_ipv6       ipv6;
  67 #endif
  68 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
  69         struct netns_dccp       dccp;
  70 #endif
  71 #ifdef CONFIG_NETFILTER
  72         struct netns_xt         xt;
  73 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  74         struct netns_ct         ct;
  75 #endif
  76 #endif
  77         struct net_generic      *gen;
  78 };
  79
  80
  81 #include <linux/seq_file_net.h>
  82
  83 /* Init's network namespace */
  84 extern struct net init_net;
  85
  86 #ifdef CONFIG_NET
  87 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
  88
  89 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
  90
  91 #else /* CONFIG_NET */
  92
  93 #define INIT_NET_NS(net_ns)
  94
  95 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
  96 {
  97         /* There is nothing to copy so this is a noop */
  98         return net_ns;
  99 }
 100 #endif /* CONFIG_NET */
 101
 102
 103 extern struct list_head net_namespace_list;
 104
 105 #ifdef CONFIG_NET_NS
 106 extern void __put_net(struct net *net);
 107
 108 static inline int net_alive(struct net *net)
 109 {
 110         return net && atomic_read(&net->count);
 111 }
 112
 113 static inline struct net *get_net(struct net *net)
 114 {
 115         atomic_inc(&net->count);
 116         return net;
 117 }
 118
 119 static inline struct net *maybe_get_net(struct net *net)
 120 {
 121         /* Used when we know struct net exists but we
 122          * aren't guaranteed a previous reference count
 123          * exists.  If the reference count is zero this
 124          * function fails and returns NULL.
 125          */
 126         if (!atomic_inc_not_zero(&net->count))
 127                 net = NULL;
 128         return net;
 129 }
 130
 131 static inline void put_net(struct net *net)
 132 {
 133         if (atomic_dec_and_test(&net->count))
 134                 __put_net(net);
 135 }
 136
 137 static inline
 138 int net_eq(const struct net *net1, const struct net *net2)
 139 {
 140         return net1 == net2;
 141 }
 142 #else
 143
 144 static inline int net_alive(struct net *net)
 145 {
 146         return 1;
 147 }
 148
 149 static inline struct net *get_net(struct net *net)
 150 {
 151         return net;
 152 }
 153
 154 static inline void put_net(struct net *net)
 155 {
 156 }
 157
 158 static inline struct net *maybe_get_net(struct net *net)
 159 {
 160         return net;
 161 }
 162
 163 static inline
 164 int net_eq(const struct net *net1, const struct net *net2)
 165 {
 166         return 1;
 167 }
 168 #endif
 169
 170
 171 #ifdef NETNS_REFCNT_DEBUG
 172 static inline struct net *hold_net(struct net *net)
 173 {
 174         if (net)
 175                 atomic_inc(&net->use_count);
 176         return net;
 177 }
 178
 179 static inline void release_net(struct net *net)
 180 {
 181         if (net)
 182                 atomic_dec(&net->use_count);
 183 }
 184 #else
 185 static inline struct net *hold_net(struct net *net)
 186 {
 187         return net;
 188 }
 189
 190 static inline void release_net(struct net *net)
 191 {
 192 }
 193 #endif
 194
 195
 196 #define for_each_net(VAR)                               \
 197         list_for_each_entry(VAR, &net_namespace_list, list)
 198
 199 #ifdef CONFIG_NET_NS
 200 #define __net_init
 201 #define __net_exit
 202 #define __net_initdata
 203 #else
 204 #define __net_init      __init
 205 #define __net_exit      __exit_refok
 206 #define __net_initdata  __initdata
 207 #endif
 208
 209 struct pernet_operations {
 210         struct list_head list;
 211         int (*init)(struct net *net);
 212         void (*exit)(struct net *net);
 213 };
 214
 215 extern int register_pernet_subsys(struct pernet_operations *);
 216 extern void unregister_pernet_subsys(struct pernet_operations *);
 217 extern int register_pernet_gen_subsys(int *id, struct pernet_operations *);
 218 extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *);
 219 extern int register_pernet_device(struct pernet_operations *);
 220 extern void unregister_pernet_device(struct pernet_operations *);
 221 extern int register_pernet_gen_device(int *id, struct pernet_operations *);
 222 extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
 223
 224 struct ctl_path;
 225 struct ctl_table;
 226 struct ctl_table_header;
 227
 228 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
 229         const struct ctl_path *path, struct ctl_table *table);
 230 extern struct ctl_table_header *register_net_sysctl_rotable(
 231         const struct ctl_path *path, struct ctl_table *table);
 232 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
 233
 234 #endif /* __NET_NET_NAMESPACE_H */