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                 .procname       = "auto_flowlabels",
  43                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  44                 .maxlen         = sizeof(int),
  45                 .mode           = 0644,
  46                 .proc_handler   = proc_dointvec
  47         },
  48         {
  49                 .procname       = "fwmark_reflect",
  50                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  51                 .maxlen         = sizeof(int),
  52                 .mode           = 0644,
  53                 .proc_handler   = proc_dointvec
  54         },
  55         { }
  56 };
  57
  58 static struct ctl_table ipv6_rotable[] = {
  59         {
  60                 .procname       = "mld_max_msf",
  61                 .data           = &sysctl_mld_max_msf,
  62                 .maxlen         = sizeof(int),
  63                 .mode           = 0644,
  64                 .proc_handler   = proc_dointvec
  65         },
  66         { }
  67 };
  68
  69 static int __net_init ipv6_sysctl_net_init(struct net *net)
  70 {
  71         struct ctl_table *ipv6_table;
  72         struct ctl_table *ipv6_route_table;
  73         struct ctl_table *ipv6_icmp_table;
  74         int err;
  75
  76         err = -ENOMEM;
  77         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  78                              GFP_KERNEL);
  79         if (!ipv6_table)
  80                 goto out;
  81         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
  82         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
  83         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
  84         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
  85
  86         ipv6_route_table = ipv6_route_sysctl_init(net);
  87         if (!ipv6_route_table)
  88                 goto out_ipv6_table;
  89
  90         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  91         if (!ipv6_icmp_table)
  92                 goto out_ipv6_route_table;
  93
  94         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
  95         if (!net->ipv6.sysctl.hdr)
  96                 goto out_ipv6_icmp_table;
  97
  98         net->ipv6.sysctl.route_hdr =
  99                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 100         if (!net->ipv6.sysctl.route_hdr)
 101                 goto out_unregister_ipv6_table;
 102
 103         net->ipv6.sysctl.icmp_hdr =
 104                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 105         if (!net->ipv6.sysctl.icmp_hdr)
 106                 goto out_unregister_route_table;
 107
 108         err = 0;
 109 out:
 110         return err;
 111 out_unregister_route_table:
 112         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 113 out_unregister_ipv6_table:
 114         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 115 out_ipv6_icmp_table:
 116         kfree(ipv6_icmp_table);
 117 out_ipv6_route_table:
 118         kfree(ipv6_route_table);
 119 out_ipv6_table:
 120         kfree(ipv6_table);
 121         goto out;
 122 }
 123
 124 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 125 {
 126         struct ctl_table *ipv6_table;
 127         struct ctl_table *ipv6_route_table;
 128         struct ctl_table *ipv6_icmp_table;
 129
 130         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 131         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 132         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 133
 134         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 135         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 136         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 137
 138         kfree(ipv6_table);
 139         kfree(ipv6_route_table);
 140         kfree(ipv6_icmp_table);
 141 }
 142
 143 static struct pernet_operations ipv6_sysctl_net_ops = {
 144         .init = ipv6_sysctl_net_init,
 145         .exit = ipv6_sysctl_net_exit,
 146 };
 147
 148 static struct ctl_table_header *ip6_header;
 149
 150 int ipv6_sysctl_register(void)
 151 {
 152         int err = -ENOMEM;
 153
 154         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 155         if (ip6_header == NULL)
 156                 goto out;
 157
 158         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 159         if (err)
 160                 goto err_pernet;
 161 out:
 162         return err;
 163
 164 err_pernet:
 165         unregister_net_sysctl_table(ip6_header);
 166         goto out;
 167 }
 168
 169 void ipv6_sysctl_unregister(void)
 170 {
 171         unregister_net_sysctl_table(ip6_header);
 172         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 173 }