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 int one = 1;
  20
  21 static struct ctl_table ipv6_table_template[] = {
  22         {
  23                 .procname       = "bindv6only",
  24                 .data           = &init_net.ipv6.sysctl.bindv6only,
  25                 .maxlen         = sizeof(int),
  26                 .mode           = 0644,
  27                 .proc_handler   = proc_dointvec
  28         },
  29         {
  30                 .procname       = "anycast_src_echo_reply",
  31                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  32                 .maxlen         = sizeof(int),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_dointvec
  35         },
  36         {
  37                 .procname       = "flowlabel_consistency",
  38                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  39                 .maxlen         = sizeof(int),
  40                 .mode           = 0644,
  41                 .proc_handler   = proc_dointvec
  42         },
  43         {
  44                 .procname       = "auto_flowlabels",
  45                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  46                 .maxlen         = sizeof(int),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec
  49         },
  50         {
  51                 .procname       = "fwmark_reflect",
  52                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  53                 .maxlen         = sizeof(int),
  54                 .mode           = 0644,
  55                 .proc_handler   = proc_dointvec
  56         },
  57         {
  58                 .procname       = "idgen_retries",
  59                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  60                 .maxlen         = sizeof(int),
  61                 .mode           = 0644,
  62                 .proc_handler   = proc_dointvec,
  63         },
  64         {
  65                 .procname       = "idgen_delay",
  66                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  67                 .maxlen         = sizeof(int),
  68                 .mode           = 0644,
  69                 .proc_handler   = proc_dointvec_jiffies,
  70         },
  71         {
  72                 .procname       = "flowlabel_state_ranges",
  73                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
  74                 .maxlen         = sizeof(int),
  75                 .mode           = 0644,
  76                 .proc_handler   = proc_dointvec
  77         },
  78         { }
  79 };
  80
  81 static struct ctl_table ipv6_rotable[] = {
  82         {
  83                 .procname       = "mld_max_msf",
  84                 .data           = &sysctl_mld_max_msf,
  85                 .maxlen         = sizeof(int),
  86                 .mode           = 0644,
  87                 .proc_handler   = proc_dointvec
  88         },
  89         {
  90                 .procname       = "mld_qrv",
  91                 .data           = &sysctl_mld_qrv,
  92                 .maxlen         = sizeof(int),
  93                 .mode           = 0644,
  94                 .proc_handler   = proc_dointvec_minmax,
  95                 .extra1         = &one
  96         },
  97         { }
  98 };
  99
 100 static int __net_init ipv6_sysctl_net_init(struct net *net)
 101 {
 102         struct ctl_table *ipv6_table;
 103         struct ctl_table *ipv6_route_table;
 104         struct ctl_table *ipv6_icmp_table;
 105         int err;
 106
 107         err = -ENOMEM;
 108         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 109                              GFP_KERNEL);
 110         if (!ipv6_table)
 111                 goto out;
 112         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
 113         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
 114         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
 115         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
 116         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
 117         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
 118         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
 119         ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
 120
 121         ipv6_route_table = ipv6_route_sysctl_init(net);
 122         if (!ipv6_route_table)
 123                 goto out_ipv6_table;
 124
 125         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 126         if (!ipv6_icmp_table)
 127                 goto out_ipv6_route_table;
 128
 129         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 130         if (!net->ipv6.sysctl.hdr)
 131                 goto out_ipv6_icmp_table;
 132
 133         net->ipv6.sysctl.route_hdr =
 134                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 135         if (!net->ipv6.sysctl.route_hdr)
 136                 goto out_unregister_ipv6_table;
 137
 138         net->ipv6.sysctl.icmp_hdr =
 139                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 140         if (!net->ipv6.sysctl.icmp_hdr)
 141                 goto out_unregister_route_table;
 142
 143         err = 0;
 144 out:
 145         return err;
 146 out_unregister_route_table:
 147         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 148 out_unregister_ipv6_table:
 149         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 150 out_ipv6_icmp_table:
 151         kfree(ipv6_icmp_table);
 152 out_ipv6_route_table:
 153         kfree(ipv6_route_table);
 154 out_ipv6_table:
 155         kfree(ipv6_table);
 156         goto out;
 157 }
 158
 159 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 160 {
 161         struct ctl_table *ipv6_table;
 162         struct ctl_table *ipv6_route_table;
 163         struct ctl_table *ipv6_icmp_table;
 164
 165         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 166         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 167         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 168
 169         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 170         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 171         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 172
 173         kfree(ipv6_table);
 174         kfree(ipv6_route_table);
 175         kfree(ipv6_icmp_table);
 176 }
 177
 178 static struct pernet_operations ipv6_sysctl_net_ops = {
 179         .init = ipv6_sysctl_net_init,
 180         .exit = ipv6_sysctl_net_exit,
 181 };
 182
 183 static struct ctl_table_header *ip6_header;
 184
 185 int ipv6_sysctl_register(void)
 186 {
 187         int err = -ENOMEM;
 188
 189         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 190         if (!ip6_header)
 191                 goto out;
 192
 193         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 194         if (err)
 195                 goto err_pernet;
 196 out:
 197         return err;
 198
 199 err_pernet:
 200         unregister_net_sysctl_table(ip6_header);
 201         goto out;
 202 }
 203
 204 void ipv6_sysctl_unregister(void)
 205 {
 206         unregister_net_sysctl_table(ip6_header);
 207         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 208 }