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