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