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 <linux/export.h>
  14 #include <net/ndisc.h>
  15 #include <net/ipv6.h>
  16 #include <net/addrconf.h>
  17 #include <net/inet_frag.h>
  18
  19 static struct ctl_table empty[1];
  20
  21 static ctl_table ipv6_static_skeleton[] = {
  22         {
  23                 .procname       = "neigh",
  24                 .maxlen         = 0,
  25                 .mode           = 0555,
  26                 .child          = empty,
  27         },
  28         { }
  29 };
  30
  31 static ctl_table ipv6_table_template[] = {
  32         {
  33                 .procname       = "route",
  34                 .maxlen         = 0,
  35                 .mode           = 0555,
  36                 .child          = ipv6_route_table_template
  37         },
  38         {
  39                 .procname       = "icmp",
  40                 .maxlen         = 0,
  41                 .mode           = 0555,
  42                 .child          = ipv6_icmp_table_template
  43         },
  44         {
  45                 .procname       = "bindv6only",
  46                 .data           = &init_net.ipv6.sysctl.bindv6only,
  47                 .maxlen         = sizeof(int),
  48                 .mode           = 0644,
  49                 .proc_handler   = proc_dointvec
  50         },
  51         { }
  52 };
  53
  54 static ctl_table ipv6_rotable[] = {
  55         {
  56                 .procname       = "mld_max_msf",
  57                 .data           = &sysctl_mld_max_msf,
  58                 .maxlen         = sizeof(int),
  59                 .mode           = 0644,
  60                 .proc_handler   = proc_dointvec
  61         },
  62         { }
  63 };
  64
  65 struct ctl_path net_ipv6_ctl_path[] = {
  66         { .procname = "net", },
  67         { .procname = "ipv6", },
  68         { },
  69 };
  70 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
  71
  72 static int __net_init ipv6_sysctl_net_init(struct net *net)
  73 {
  74         struct ctl_table *ipv6_table;
  75         struct ctl_table *ipv6_route_table;
  76         struct ctl_table *ipv6_icmp_table;
  77         int err;
  78
  79         err = -ENOMEM;
  80         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  81                              GFP_KERNEL);
  82         if (!ipv6_table)
  83                 goto out;
  84
  85         ipv6_route_table = ipv6_route_sysctl_init(net);
  86         if (!ipv6_route_table)
  87                 goto out_ipv6_table;
  88         ipv6_table[0].child = ipv6_route_table;
  89
  90         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  91         if (!ipv6_icmp_table)
  92                 goto out_ipv6_route_table;
  93         ipv6_table[1].child = ipv6_icmp_table;
  94
  95         ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
  96
  97         net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
  98                                                            ipv6_table);
  99         if (!net->ipv6.sysctl.table)
 100                 goto out_ipv6_icmp_table;
 101
 102         err = 0;
 103 out:
 104         return err;
 105
 106 out_ipv6_icmp_table:
 107         kfree(ipv6_icmp_table);
 108 out_ipv6_route_table:
 109         kfree(ipv6_route_table);
 110 out_ipv6_table:
 111         kfree(ipv6_table);
 112         goto out;
 113 }
 114
 115 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 116 {
 117         struct ctl_table *ipv6_table;
 118         struct ctl_table *ipv6_route_table;
 119         struct ctl_table *ipv6_icmp_table;
 120
 121         ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
 122         ipv6_route_table = ipv6_table[0].child;
 123         ipv6_icmp_table = ipv6_table[1].child;
 124
 125         unregister_net_sysctl_table(net->ipv6.sysctl.table);
 126
 127         kfree(ipv6_table);
 128         kfree(ipv6_route_table);
 129         kfree(ipv6_icmp_table);
 130 }
 131
 132 static struct pernet_operations ipv6_sysctl_net_ops = {
 133         .init = ipv6_sysctl_net_init,
 134         .exit = ipv6_sysctl_net_exit,
 135 };
 136
 137 static struct ctl_table_header *ip6_header;
 138
 139 int ipv6_sysctl_register(void)
 140 {
 141         int err = -ENOMEM;
 142
 143         ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_rotable);
 144         if (ip6_header == NULL)
 145                 goto out;
 146
 147         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 148         if (err)
 149                 goto err_pernet;
 150 out:
 151         return err;
 152
 153 err_pernet:
 154         unregister_net_sysctl_table(ip6_header);
 155         goto out;
 156 }
 157
 158 void ipv6_sysctl_unregister(void)
 159 {
 160         unregister_net_sysctl_table(ip6_header);
 161         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 162 }
 163
 164 static struct ctl_table_header *ip6_base;
 165
 166 int ipv6_static_sysctl_register(void)
 167 {
 168         ip6_base = register_sysctl_paths(net_ipv6_ctl_path, ipv6_static_skeleton);
 169         if (ip6_base == NULL)
 170                 return -ENOMEM;
 171         return 0;
 172 }
 173
 174 void ipv6_static_sysctl_unregister(void)
 175 {
 176         unregister_net_sysctl_table(ip6_base);
 177 }