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 #include <net/netns/xfrm.h>
  23
  24 struct proc_dir_entry;
  25 struct net_device;
  26 struct sock;
  27 struct ctl_table_header;
  28 struct net_generic;
  29
  30 struct net {
  31         atomic_t                count;          /* To decided when the network
  32                                                  *  namespace should be freed.
  33                                                  */
  34 #ifdef NETNS_REFCNT_DEBUG
  35         atomic_t                use_count;      /* To track references we
  36                                                  * destroy on demand
  37                                                  */
  38 #endif
  39         struct list_head        list;           /* list of network namespaces */
  40         struct work_struct      work;           /* work struct for freeing */
  41
  42         struct proc_dir_entry   *proc_net;
  43         struct proc_dir_entry   *proc_net_stat;
  44
  45 #ifdef CONFIG_SYSCTL
  46         struct ctl_table_set    sysctls;
  47 #endif
  48
  49         struct net_device       *loopback_dev;          /* The loopback */
  50
  51         struct list_head        dev_base_head;
  52         struct hlist_head       *dev_name_head;
  53         struct hlist_head       *dev_index_head;
  54
  55         /* core fib_rules */
  56         struct list_head        rules_ops;
  57         spinlock_t              rules_mod_lock;
  58
  59         struct sock             *rtnl;                  /* rtnetlink socket */
  60
  61         struct netns_core       core;
  62         struct netns_mib        mib;
  63         struct netns_packet     packet;
  64         struct netns_unix       unx;
  65         struct netns_ipv4       ipv4;
  66 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  67         struct netns_ipv6       ipv6;
  68 #endif
  69 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
  70         struct netns_dccp       dccp;
  71 #endif
  72 #ifdef CONFIG_NETFILTER
  73         struct netns_xt         xt;
  74 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  75         struct netns_ct         ct;
  76 #endif
  77 #endif
  78 #ifdef CONFIG_XFRM
  79         struct netns_xfrm       xfrm;
  80 #endif
  81         struct net_generic      *gen;
  82 };
  83
  84
  85 #include <linux/seq_file_net.h>
  86
  87 /* Init's network namespace */
  88 extern struct net init_net;
  89
  90 #ifdef CONFIG_NET
  91 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
  92
  93 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
  94
  95 #else /* CONFIG_NET */
  96
  97 #define INIT_NET_NS(net_ns)
  98
  99 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
 100 {
 101         /* There is nothing to copy so this is a noop */
 102         return net_ns;
 103 }
 104 #endif /* CONFIG_NET */
 105
 106
 107 extern struct list_head net_namespace_list;
 108
 109 #ifdef CONFIG_NET_NS
 110 extern void __put_net(struct net *net);
 111
 112 static inline int net_alive(struct net *net)
 113 {
 114         return net && atomic_read(&net->count);
 115 }
 116
 117 static inline struct net *get_net(struct net *net)
 118 {
 119         atomic_inc(&net->count);
 120         return net;
 121 }
 122
 123 static inline struct net *maybe_get_net(struct net *net)
 124 {
 125         /* Used when we know struct net exists but we
 126          * aren't guaranteed a previous reference count
 127          * exists.  If the reference count is zero this
 128          * function fails and returns NULL.
 129          */
 130         if (!atomic_inc_not_zero(&net->count))
 131                 net = NULL;
 132         return net;
 133 }
 134
 135 static inline void put_net(struct net *net)
 136 {
 137         if (atomic_dec_and_test(&net->count))
 138                 __put_net(net);
 139 }
 140
 141 static inline
 142 int net_eq(const struct net *net1, const struct net *net2)
 143 {
 144         return net1 == net2;
 145 }
 146 #else
 147
 148 static inline int net_alive(struct net *net)
 149 {
 150         return 1;
 151 }
 152
 153 static inline struct net *get_net(struct net *net)
 154 {
 155         return net;
 156 }
 157
 158 static inline void put_net(struct net *net)
 159 {
 160 }
 161
 162 static inline struct net *maybe_get_net(struct net *net)
 163 {
 164         return net;
 165 }
 166
 167 static inline
 168 int net_eq(const struct net *net1, const struct net *net2)
 169 {
 170         return 1;
 171 }
 172 #endif
 173
 174
 175 #ifdef NETNS_REFCNT_DEBUG
 176 static inline struct net *hold_net(struct net *net)
 177 {
 178         if (net)
 179                 atomic_inc(&net->use_count);
 180         return net;
 181 }
 182
 183 static inline void release_net(struct net *net)
 184 {
 185         if (net)
 186                 atomic_dec(&net->use_count);
 187 }
 188 #else
 189 static inline struct net *hold_net(struct net *net)
 190 {
 191         return net;
 192 }
 193
 194 static inline void release_net(struct net *net)
 195 {
 196 }
 197 #endif
 198
 199 #ifdef CONFIG_NET_NS
 200
 201 static inline void write_pnet(struct net **pnet, struct net *net)
 202 {
 203         *pnet = net;
 204 }
 205
 206 static inline struct net *read_pnet(struct net * const *pnet)
 207 {
 208         return *pnet;
 209 }
 210
 211 #else
 212
 213 #define write_pnet(pnet, net)   do { (void)(net);} while (0)
 214 #define read_pnet(pnet)         (&init_net)
 215
 216 #endif
 217
 218 #define for_each_net(VAR)                               \
 219         list_for_each_entry(VAR, &net_namespace_list, list)
 220
 221 #ifdef CONFIG_NET_NS
 222 #define __net_init
 223 #define __net_exit
 224 #define __net_initdata
 225 #else
 226 #define __net_init      __init
 227 #define __net_exit      __exit_refok
 228 #define __net_initdata  __initdata
 229 #endif
 230
 231 struct pernet_operations {
 232         struct list_head list;
 233         int (*init)(struct net *net);
 234         void (*exit)(struct net *net);
 235 };
 236
 237 extern int register_pernet_subsys(struct pernet_operations *);
 238 extern void unregister_pernet_subsys(struct pernet_operations *);
 239 extern int register_pernet_gen_subsys(int *id, struct pernet_operations *);
 240 extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *);
 241 extern int register_pernet_device(struct pernet_operations *);
 242 extern void unregister_pernet_device(struct pernet_operations *);
 243 extern int register_pernet_gen_device(int *id, struct pernet_operations *);
 244 extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
 245
 246 struct ctl_path;
 247 struct ctl_table;
 248 struct ctl_table_header;
 249
 250 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
 251         const struct ctl_path *path, struct ctl_table *table);
 252 extern struct ctl_table_header *register_net_sysctl_rotable(
 253         const struct ctl_path *path, struct ctl_table *table);
 254 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
 255
 256 #endif /* __NET_NET_NAMESPACE_H */