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