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 struct 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 struct 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 static int __net_init ipv6_sysctl_net_init(struct net *net)
  42 {
  43         struct ctl_table *ipv6_table;
  44         struct ctl_table *ipv6_route_table;
  45         struct ctl_table *ipv6_icmp_table;
  46         int err;
  47
  48         err = -ENOMEM;
  49         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  50                              GFP_KERNEL);
  51         if (!ipv6_table)
  52                 goto out;
  53         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
  54
  55         ipv6_route_table = ipv6_route_sysctl_init(net);
  56         if (!ipv6_route_table)
  57                 goto out_ipv6_table;
  58
  59         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  60         if (!ipv6_icmp_table)
  61                 goto out_ipv6_route_table;
  62
  63         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
  64         if (!net->ipv6.sysctl.hdr)
  65                 goto out_ipv6_icmp_table;
  66
  67         net->ipv6.sysctl.route_hdr =
  68                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
  69         if (!net->ipv6.sysctl.route_hdr)
  70                 goto out_unregister_ipv6_table;
  71
  72         net->ipv6.sysctl.icmp_hdr =
  73                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
  74         if (!net->ipv6.sysctl.icmp_hdr)
  75                 goto out_unregister_route_table;
  76
  77         err = 0;
  78 out:
  79         return err;
  80 out_unregister_route_table:
  81         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
  82 out_unregister_ipv6_table:
  83         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
  84 out_ipv6_icmp_table:
  85         kfree(ipv6_icmp_table);
  86 out_ipv6_route_table:
  87         kfree(ipv6_route_table);
  88 out_ipv6_table:
  89         kfree(ipv6_table);
  90         goto out;
  91 }
  92
  93 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
  94 {
  95         struct ctl_table *ipv6_table;
  96         struct ctl_table *ipv6_route_table;
  97         struct ctl_table *ipv6_icmp_table;
  98
  99         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 100         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 101         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 102
 103         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 104         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 105         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 106
 107         kfree(ipv6_table);
 108         kfree(ipv6_route_table);
 109         kfree(ipv6_icmp_table);
 110 }
 111
 112 static struct pernet_operations ipv6_sysctl_net_ops = {
 113         .init = ipv6_sysctl_net_init,
 114         .exit = ipv6_sysctl_net_exit,
 115 };
 116
 117 static struct ctl_table_header *ip6_header;
 118
 119 int ipv6_sysctl_register(void)
 120 {
 121         int err = -ENOMEM;
 122
 123         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 124         if (ip6_header == NULL)
 125                 goto out;
 126
 127         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 128         if (err)
 129                 goto err_pernet;
 130 out:
 131         return err;
 132
 133 err_pernet:
 134         unregister_net_sysctl_table(ip6_header);
 135         goto out;
 136 }
 137
 138 void ipv6_sysctl_unregister(void)
 139 {
 140         unregister_net_sysctl_table(ip6_header);
 141         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 142 }