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       = "bindv6only",
  22                 .data           = &init_net.ipv6.sysctl.bindv6only,
  23                 .maxlen         = sizeof(int),
  24                 .mode           = 0644,
  25                 .proc_handler   = proc_dointvec
  26         },
  27         { }
  28 };
  29
  30 static ctl_table ipv6_rotable[] = {
  31         {
  32                 .procname       = "mld_max_msf",
  33                 .data           = &sysctl_mld_max_msf,
  34                 .maxlen         = sizeof(int),
  35                 .mode           = 0644,
  36                 .proc_handler   = proc_dointvec
  37         },
  38         { }
  39 };
  40
  41 struct ctl_path net_ipv6_ctl_path[] = {
  42         { .procname = "net", },
  43         { .procname = "ipv6", },
  44         { },
  45 };
  46 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
  47
  48 static int __net_init ipv6_sysctl_net_init(struct net *net)
  49 {
  50         struct ctl_table *ipv6_table;
  51         struct ctl_table *ipv6_route_table;
  52         struct ctl_table *ipv6_icmp_table;
  53         int err;
  54
  55         err = -ENOMEM;
  56         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  57                              GFP_KERNEL);
  58         if (!ipv6_table)
  59                 goto out;
  60         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
  61
  62         ipv6_route_table = ipv6_route_sysctl_init(net);
  63         if (!ipv6_route_table)
  64                 goto out_ipv6_table;
  65
  66         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  67         if (!ipv6_icmp_table)
  68                 goto out_ipv6_route_table;
  69
  70         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
  71         if (!net->ipv6.sysctl.hdr)
  72                 goto out_ipv6_icmp_table;
  73
  74         net->ipv6.sysctl.route_hdr =
  75                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
  76         if (!net->ipv6.sysctl.route_hdr)
  77                 goto out_unregister_ipv6_table;
  78
  79         net->ipv6.sysctl.icmp_hdr =
  80                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
  81         if (!net->ipv6.sysctl.icmp_hdr)
  82                 goto out_unregister_route_table;
  83
  84         err = 0;
  85 out:
  86         return err;
  87 out_unregister_route_table:
  88         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
  89 out_unregister_ipv6_table:
  90         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
  91 out_ipv6_icmp_table:
  92         kfree(ipv6_icmp_table);
  93 out_ipv6_route_table:
  94         kfree(ipv6_route_table);
  95 out_ipv6_table:
  96         kfree(ipv6_table);
  97         goto out;
  98 }
  99
 100 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 101 {
 102         struct ctl_table *ipv6_table;
 103         struct ctl_table *ipv6_route_table;
 104         struct ctl_table *ipv6_icmp_table;
 105
 106         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 107         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 108         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 109
 110         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 111         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 112         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 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(&init_net, "net/ipv6", 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 }