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 <linux/slab.h>
  13 #include <net/ndisc.h>
  14 #include <net/ipv6.h>
  15 #include <net/addrconf.h>
  16 #include <net/inet_frag.h>
  17
  18 static ctl_table ipv6_table_template[] = {
  19         {
  20                 .procname       = "route",
  21                 .maxlen         = 0,
  22                 .mode           = 0555,
  23                 .child          = ipv6_route_table_template
  24         },
  25         {
  26                 .procname       = "icmp",
  27                 .maxlen         = 0,
  28                 .mode           = 0555,
  29                 .child          = ipv6_icmp_table_template
  30         },
  31         {
  32                 .procname       = "bindv6only",
  33                 .data           = &init_net.ipv6.sysctl.bindv6only,
  34                 .maxlen         = sizeof(int),
  35                 .mode           = 0644,
  36                 .proc_handler   = proc_dointvec
  37         },
  38         { }
  39 };
  40
  41 static ctl_table ipv6_rotable[] = {
  42         {
  43                 .procname       = "mld_max_msf",
  44                 .data           = &sysctl_mld_max_msf,
  45                 .maxlen         = sizeof(int),
  46                 .mode           = 0644,
  47                 .proc_handler   = proc_dointvec
  48         },
  49         { }
  50 };
  51
  52 struct ctl_path net_ipv6_ctl_path[] = {
  53         { .procname = "net", },
  54         { .procname = "ipv6", },
  55         { },
  56 };
  57 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
  58
  59 static int __net_init ipv6_sysctl_net_init(struct net *net)
  60 {
  61         struct ctl_table *ipv6_table;
  62         struct ctl_table *ipv6_route_table;
  63         struct ctl_table *ipv6_icmp_table;
  64         int err;
  65
  66         err = -ENOMEM;
  67         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  68                              GFP_KERNEL);
  69         if (!ipv6_table)
  70                 goto out;
  71
  72         ipv6_route_table = ipv6_route_sysctl_init(net);
  73         if (!ipv6_route_table)
  74                 goto out_ipv6_table;
  75         ipv6_table[0].child = ipv6_route_table;
  76
  77         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  78         if (!ipv6_icmp_table)
  79                 goto out_ipv6_route_table;
  80         ipv6_table[1].child = ipv6_icmp_table;
  81
  82         ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
  83
  84         net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
  85                                                            ipv6_table);
  86         if (!net->ipv6.sysctl.table)
  87                 goto out_ipv6_icmp_table;
  88
  89         err = 0;
  90 out:
  91         return err;
  92
  93 out_ipv6_icmp_table:
  94         kfree(ipv6_icmp_table);
  95 out_ipv6_route_table:
  96         kfree(ipv6_route_table);
  97 out_ipv6_table:
  98         kfree(ipv6_table);
  99         goto out;
 100 }
 101
 102 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 103 {
 104         struct ctl_table *ipv6_table;
 105         struct ctl_table *ipv6_route_table;
 106         struct ctl_table *ipv6_icmp_table;
 107
 108         ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
 109         ipv6_route_table = ipv6_table[0].child;
 110         ipv6_icmp_table = ipv6_table[1].child;
 111
 112         unregister_net_sysctl_table(net->ipv6.sysctl.table);
 113
 114         kfree(ipv6_table);
 115         kfree(ipv6_route_table);
 116         kfree(ipv6_icmp_table);
 117 }
 118
 119 static struct pernet_operations ipv6_sysctl_net_ops = {
 120         .init = ipv6_sysctl_net_init,
 121         .exit = ipv6_sysctl_net_exit,
 122 };
 123
 124 static struct ctl_table_header *ip6_header;
 125
 126 int ipv6_sysctl_register(void)
 127 {
 128         int err = -ENOMEM;
 129
 130         ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_rotable);
 131         if (ip6_header == NULL)
 132                 goto out;
 133
 134         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 135         if (err)
 136                 goto err_pernet;
 137 out:
 138         return err;
 139
 140 err_pernet:
 141         unregister_net_sysctl_table(ip6_header);
 142         goto out;
 143 }
 144
 145 void ipv6_sysctl_unregister(void)
 146 {
 147         unregister_net_sysctl_table(ip6_header);
 148         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 149 }
 150
 151 static struct ctl_table_header *ip6_base;
 152
 153 int ipv6_static_sysctl_register(void)
 154 {
 155         static struct ctl_table empty[1];
 156         ip6_base = register_sysctl_paths(net_ipv6_ctl_path, empty);
 157         if (ip6_base == NULL)
 158                 return -ENOMEM;
 159         return 0;
 160 }
 161
 162 void ipv6_static_sysctl_unregister(void)
 163 {
 164         unregister_net_sysctl_table(ip6_base);
 165 }