net/sysctl_net.c

   1 /* -*- linux-c -*-
   2  * sysctl_net.c: sysctl interface to net subsystem.
   3  *
   4  * Begun April 1, 1996, Mike Shaver.
   5  * Added /proc/sys/net directories for each protocol family. [MS]
   6  *
   7  * $Log: sysctl_net.c,v $
   8  * Revision 1.2  1996/05/08  20:24:40  shaver
   9  * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
  10  * NET_IPV4_IP_FORWARD.
  11  *
  12  *
  13  */
  14
  15 #include <linux/mm.h>
  16 #include <linux/sysctl.h>
  17 #include <linux/nsproxy.h>
  18
  19 #include <net/sock.h>
  20
  21 #ifdef CONFIG_INET
  22 #include <net/ip.h>
  23 #endif
  24
  25 #ifdef CONFIG_NET
  26 #include <linux/if_ether.h>
  27 #endif
  28
  29 #ifdef CONFIG_TR
  30 #include <linux/if_tr.h>
  31 #endif
  32
  33 struct ctl_table net_table[] = {
  34         {
  35                 .ctl_name       = NET_CORE,
  36                 .procname       = "core",
  37                 .mode           = 0555,
  38                 .child          = core_table,
  39         },
  40 #ifdef CONFIG_INET
  41         {
  42                 .ctl_name       = NET_IPV4,
  43                 .procname       = "ipv4",
  44                 .mode           = 0555,
  45                 .child          = ipv4_table
  46         },
  47 #endif
  48 #ifdef CONFIG_TR
  49         {
  50                 .ctl_name       = NET_TR,
  51                 .procname       = "token-ring",
  52                 .mode           = 0555,
  53                 .child          = tr_table,
  54         },
  55 #endif
  56         { 0 },
  57 };
  58
  59 static struct list_head *
  60 net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
  61 {
  62         return &namespaces->net_ns->sysctl_table_headers;
  63 }
  64
  65 static struct ctl_table_root net_sysctl_root = {
  66         .lookup = net_ctl_header_lookup,
  67 };
  68
  69 static int sysctl_net_init(struct net *net)
  70 {
  71         INIT_LIST_HEAD(&net->sysctl_table_headers);
  72         return 0;
  73 }
  74
  75 static void sysctl_net_exit(struct net *net)
  76 {
  77         WARN_ON(!list_empty(&net->sysctl_table_headers));
  78         return;
  79 }
  80
  81 static struct pernet_operations sysctl_pernet_ops = {
  82         .init = sysctl_net_init,
  83         .exit = sysctl_net_exit,
  84 };
  85
  86 static __init int sysctl_init(void)
  87 {
  88         int ret;
  89         ret = register_pernet_subsys(&sysctl_pernet_ops);
  90         if (ret)
  91                 goto out;
  92         register_sysctl_root(&net_sysctl_root);
  93 out:
  94         return ret;
  95 }
  96 subsys_initcall(sysctl_init);
  97
  98 struct ctl_table_header *register_net_sysctl_table(struct net *net,
  99         const struct ctl_path *path, struct ctl_table *table)
 100 {
 101         struct nsproxy namespaces;
 102         namespaces = *current->nsproxy;
 103         namespaces.net_ns = net;
 104         return __register_sysctl_paths(&net_sysctl_root,
 105                                         &namespaces, path, table);
 106 }
 107 EXPORT_SYMBOL_GPL(register_net_sysctl_table);
 108
 109 void unregister_net_sysctl_table(struct ctl_table_header *header)
 110 {
 111         return unregister_sysctl_table(header);
 112 }
 113 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);