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 static struct list_head *
  34 net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
  35 {
  36         return &namespaces->net_ns->sysctl_table_headers;
  37 }
  38
  39 static struct ctl_table_root net_sysctl_root = {
  40         .lookup = net_ctl_header_lookup,
  41 };
  42
  43 static int sysctl_net_init(struct net *net)
  44 {
  45         INIT_LIST_HEAD(&net->sysctl_table_headers);
  46         return 0;
  47 }
  48
  49 static void sysctl_net_exit(struct net *net)
  50 {
  51         WARN_ON(!list_empty(&net->sysctl_table_headers));
  52         return;
  53 }
  54
  55 static struct pernet_operations sysctl_pernet_ops = {
  56         .init = sysctl_net_init,
  57         .exit = sysctl_net_exit,
  58 };
  59
  60 static __init int sysctl_init(void)
  61 {
  62         int ret;
  63         ret = register_pernet_subsys(&sysctl_pernet_ops);
  64         if (ret)
  65                 goto out;
  66         register_sysctl_root(&net_sysctl_root);
  67 out:
  68         return ret;
  69 }
  70 subsys_initcall(sysctl_init);
  71
  72 struct ctl_table_header *register_net_sysctl_table(struct net *net,
  73         const struct ctl_path *path, struct ctl_table *table)
  74 {
  75         struct nsproxy namespaces;
  76         namespaces = *current->nsproxy;
  77         namespaces.net_ns = net;
  78         return __register_sysctl_paths(&net_sysctl_root,
  79                                         &namespaces, path, table);
  80 }
  81 EXPORT_SYMBOL_GPL(register_net_sysctl_table);
  82
  83 void unregister_net_sysctl_table(struct ctl_table_header *header)
  84 {
  85         return unregister_sysctl_table(header);
  86 }
  87 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);