net/ipv6/sysctl_net_ipv6.c

   1 /*
   2  * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
   3  *
   4  * Changes:
   5  * YOSHIFUJI Hideaki @USAGI:    added icmp sysctl table.
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/sysctl.h>
  10 #include <linux/in6.h>
  11 #include <linux/ipv6.h>
  12 #include <net/ndisc.h>
  13 #include <net/ipv6.h>
  14 #include <net/addrconf.h>
  15 #include <net/inet_frag.h>
  16
  17 static ctl_table ipv6_table_template[] = {
  18         {
  19                 .ctl_name       = NET_IPV6_ROUTE,
  20                 .procname       = "route",
  21                 .maxlen         = 0,
  22                 .mode           = 0555,
  23                 .child          = ipv6_route_table_template
  24         },
  25         {
  26                 .ctl_name       = NET_IPV6_ICMP,
  27                 .procname       = "icmp",
  28                 .maxlen         = 0,
  29                 .mode           = 0555,
  30                 .child          = ipv6_icmp_table_template
  31         },
  32         {
  33                 .ctl_name       = NET_IPV6_BINDV6ONLY,
  34                 .procname       = "bindv6only",
  35                 .data           = &init_net.ipv6.sysctl.bindv6only,
  36                 .maxlen         = sizeof(int),
  37                 .mode           = 0644,
  38                 .proc_handler   = proc_dointvec
  39         },
  40         { .ctl_name = 0 }
  41 };
  42
  43 static ctl_table ipv6_table[] = {
  44         {
  45                 .ctl_name       = NET_IPV6_MLD_MAX_MSF,
  46                 .procname       = "mld_max_msf",
  47                 .data           = &sysctl_mld_max_msf,
  48                 .maxlen         = sizeof(int),
  49                 .mode           = 0644,
  50                 .proc_handler   = proc_dointvec
  51         },
  52         { .ctl_name = 0 }
  53 };
  54
  55 struct ctl_path net_ipv6_ctl_path[] = {
  56         { .procname = "net", .ctl_name = CTL_NET, },
  57         { .procname = "ipv6", .ctl_name = NET_IPV6, },
  58         { },
  59 };
  60 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
  61
  62 static int ipv6_sysctl_net_init(struct net *net)
  63 {
  64         struct ctl_table *ipv6_table;
  65         struct ctl_table *ipv6_route_table;
  66         struct ctl_table *ipv6_icmp_table;
  67         int err;
  68
  69         err = -ENOMEM;
  70         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  71                              GFP_KERNEL);
  72         if (!ipv6_table)
  73                 goto out;
  74
  75         ipv6_route_table = ipv6_route_sysctl_init(net);
  76         if (!ipv6_route_table)
  77                 goto out_ipv6_table;
  78         ipv6_table[0].child = ipv6_route_table;
  79
  80         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  81         if (!ipv6_icmp_table)
  82                 goto out_ipv6_route_table;
  83         ipv6_table[1].child = ipv6_icmp_table;
  84
  85         ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
  86
  87         net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
  88                                                            ipv6_table);
  89         if (!net->ipv6.sysctl.table)
  90                 goto out_ipv6_icmp_table;
  91
  92         err = 0;
  93 out:
  94         return err;
  95
  96 out_ipv6_icmp_table:
  97         kfree(ipv6_icmp_table);
  98 out_ipv6_route_table:
  99         kfree(ipv6_route_table);
 100 out_ipv6_table:
 101         kfree(ipv6_table);
 102         goto out;
 103 }
 104
 105 static void ipv6_sysctl_net_exit(struct net *net)
 106 {
 107         struct ctl_table *ipv6_table;
 108         struct ctl_table *ipv6_route_table;
 109         struct ctl_table *ipv6_icmp_table;
 110
 111         ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
 112         ipv6_route_table = ipv6_table[0].child;
 113         ipv6_icmp_table = ipv6_table[1].child;
 114
 115         unregister_net_sysctl_table(net->ipv6.sysctl.table);
 116
 117         kfree(ipv6_table);
 118         kfree(ipv6_route_table);
 119         kfree(ipv6_icmp_table);
 120 }
 121
 122 static struct pernet_operations ipv6_sysctl_net_ops = {
 123         .init = ipv6_sysctl_net_init,
 124         .exit = ipv6_sysctl_net_exit,
 125 };
 126
 127 static struct ctl_table_header *ip6_header;
 128
 129 int ipv6_sysctl_register(void)
 130 {
 131         int err = -ENOMEM;
 132
 133         ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_table);
 134         if (ip6_header == NULL)
 135                 goto out;
 136
 137         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 138         if (err)
 139                 goto err_pernet;
 140 out:
 141         return err;
 142
 143 err_pernet:
 144         unregister_net_sysctl_table(ip6_header);
 145         goto out;
 146 }
 147
 148 void ipv6_sysctl_unregister(void)
 149 {
 150         unregister_net_sysctl_table(ip6_header);
 151         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 152 }
 153
 154 static struct ctl_table_header *ip6_base;
 155
 156 int ipv6_static_sysctl_register(void)
 157 {
 158         static struct ctl_table empty[1];
 159         ip6_base = register_sysctl_paths(net_ipv6_ctl_path, empty);
 160         if (ip6_base == NULL)
 161                 return -ENOMEM;
 162         return 0;
 163 }
 164
 165 void ipv6_static_sysctl_unregister(void)
 166 {
 167         unregister_net_sysctl_table(ip6_base);
 168 }