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                 .procname       = "anycast_src_echo_reply",
  29                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  30                 .maxlen         = sizeof(int),
  31                 .mode           = 0644,
  32                 .proc_handler   = proc_dointvec
  33         },
  34         {
  35                 .procname       = "flowlabel_consistency",
  36                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  37                 .maxlen         = sizeof(int),
  38                 .mode           = 0644,
  39                 .proc_handler   = proc_dointvec
  40         },
  41         { }
  42 };
  43
  44 static struct ctl_table ipv6_rotable[] = {
  45         {
  46                 .procname       = "mld_max_msf",
  47                 .data           = &sysctl_mld_max_msf,
  48                 .maxlen         = sizeof(int),
  49                 .mode           = 0644,
  50                 .proc_handler   = proc_dointvec
  51         },
  52         { }
  53 };
  54
  55 static int __net_init ipv6_sysctl_net_init(struct net *net)
  56 {
  57         struct ctl_table *ipv6_table;
  58         struct ctl_table *ipv6_route_table;
  59         struct ctl_table *ipv6_icmp_table;
  60         int err;
  61
  62         err = -ENOMEM;
  63         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  64                              GFP_KERNEL);
  65         if (!ipv6_table)
  66                 goto out;
  67         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
  68         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
  69         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
  70
  71         ipv6_route_table = ipv6_route_sysctl_init(net);
  72         if (!ipv6_route_table)
  73                 goto out_ipv6_table;
  74
  75         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  76         if (!ipv6_icmp_table)
  77                 goto out_ipv6_route_table;
  78
  79         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
  80         if (!net->ipv6.sysctl.hdr)
  81                 goto out_ipv6_icmp_table;
  82
  83         net->ipv6.sysctl.route_hdr =
  84                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
  85         if (!net->ipv6.sysctl.route_hdr)
  86                 goto out_unregister_ipv6_table;
  87
  88         net->ipv6.sysctl.icmp_hdr =
  89                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
  90         if (!net->ipv6.sysctl.icmp_hdr)
  91                 goto out_unregister_route_table;
  92
  93         err = 0;
  94 out:
  95         return err;
  96 out_unregister_route_table:
  97         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
  98 out_unregister_ipv6_table:
  99         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 100 out_ipv6_icmp_table:
 101         kfree(ipv6_icmp_table);
 102 out_ipv6_route_table:
 103         kfree(ipv6_route_table);
 104 out_ipv6_table:
 105         kfree(ipv6_table);
 106         goto out;
 107 }
 108
 109 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 110 {
 111         struct ctl_table *ipv6_table;
 112         struct ctl_table *ipv6_route_table;
 113         struct ctl_table *ipv6_icmp_table;
 114
 115         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 116         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 117         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 118
 119         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 120         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 121         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 122
 123         kfree(ipv6_table);
 124         kfree(ipv6_route_table);
 125         kfree(ipv6_icmp_table);
 126 }
 127
 128 static struct pernet_operations ipv6_sysctl_net_ops = {
 129         .init = ipv6_sysctl_net_init,
 130         .exit = ipv6_sysctl_net_exit,
 131 };
 132
 133 static struct ctl_table_header *ip6_header;
 134
 135 int ipv6_sysctl_register(void)
 136 {
 137         int err = -ENOMEM;
 138
 139         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 140         if (ip6_header == NULL)
 141                 goto out;
 142
 143         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 144         if (err)
 145                 goto err_pernet;
 146 out:
 147         return err;
 148
 149 err_pernet:
 150         unregister_net_sysctl_table(ip6_header);
 151         goto out;
 152 }
 153
 154 void ipv6_sysctl_unregister(void)
 155 {
 156         unregister_net_sysctl_table(ip6_header);
 157         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 158 }