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