net/ipv6/sysctl_net_ipv6.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
   4  *
   5  * Changes:
   6  * YOSHIFUJI Hideaki @USAGI:    added icmp sysctl table.
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/in6.h>
  12 #include <linux/ipv6.h>
  13 #include <linux/slab.h>
  14 #include <linux/export.h>
  15 #include <net/ndisc.h>
  16 #include <net/ipv6.h>
  17 #include <net/addrconf.h>
  18 #include <net/inet_frag.h>
  19 #ifdef CONFIG_NETLABEL
  20 #include <net/calipso.h>
  21 #endif
  22
  23 static int one = 1;
  24 static int auto_flowlabels_min;
  25 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
  26
  27
  28 static struct ctl_table ipv6_table_template[] = {
  29         {
  30                 .procname       = "bindv6only",
  31                 .data           = &init_net.ipv6.sysctl.bindv6only,
  32                 .maxlen         = sizeof(int),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_dointvec
  35         },
  36         {
  37                 .procname       = "anycast_src_echo_reply",
  38                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  39                 .maxlen         = sizeof(int),
  40                 .mode           = 0644,
  41                 .proc_handler   = proc_dointvec
  42         },
  43         {
  44                 .procname       = "flowlabel_consistency",
  45                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  46                 .maxlen         = sizeof(int),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec
  49         },
  50         {
  51                 .procname       = "auto_flowlabels",
  52                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  53                 .maxlen         = sizeof(int),
  54                 .mode           = 0644,
  55                 .proc_handler   = proc_dointvec_minmax,
  56                 .extra1         = &auto_flowlabels_min,
  57                 .extra2         = &auto_flowlabels_max
  58         },
  59         {
  60                 .procname       = "fwmark_reflect",
  61                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  62                 .maxlen         = sizeof(int),
  63                 .mode           = 0644,
  64                 .proc_handler   = proc_dointvec
  65         },
  66         {
  67                 .procname       = "idgen_retries",
  68                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  69                 .maxlen         = sizeof(int),
  70                 .mode           = 0644,
  71                 .proc_handler   = proc_dointvec,
  72         },
  73         {
  74                 .procname       = "idgen_delay",
  75                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  76                 .maxlen         = sizeof(int),
  77                 .mode           = 0644,
  78                 .proc_handler   = proc_dointvec_jiffies,
  79         },
  80         {
  81                 .procname       = "flowlabel_state_ranges",
  82                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
  83                 .maxlen         = sizeof(int),
  84                 .mode           = 0644,
  85                 .proc_handler   = proc_dointvec
  86         },
  87         {
  88                 .procname       = "ip_nonlocal_bind",
  89                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
  90                 .maxlen         = sizeof(int),
  91                 .mode           = 0644,
  92                 .proc_handler   = proc_dointvec
  93         },
  94         {
  95                 .procname       = "flowlabel_reflect",
  96                 .data           = &init_net.ipv6.sysctl.flowlabel_reflect,
  97                 .maxlen         = sizeof(int),
  98                 .mode           = 0644,
  99                 .proc_handler   = proc_dointvec,
 100         },
 101         {
 102                 .procname       = "max_dst_opts_number",
 103                 .data           = &init_net.ipv6.sysctl.max_dst_opts_cnt,
 104                 .maxlen         = sizeof(int),
 105                 .mode           = 0644,
 106                 .proc_handler   = proc_dointvec
 107         },
 108         {
 109                 .procname       = "max_hbh_opts_number",
 110                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
 111                 .maxlen         = sizeof(int),
 112                 .mode           = 0644,
 113                 .proc_handler   = proc_dointvec
 114         },
 115         {
 116                 .procname       = "max_dst_opts_length",
 117                 .data           = &init_net.ipv6.sysctl.max_dst_opts_len,
 118                 .maxlen         = sizeof(int),
 119                 .mode           = 0644,
 120                 .proc_handler   = proc_dointvec
 121         },
 122         {
 123                 .procname       = "max_hbh_length",
 124                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_len,
 125                 .maxlen         = sizeof(int),
 126                 .mode           = 0644,
 127                 .proc_handler   = proc_dointvec
 128         },
 129         { }
 130 };
 131
 132 static struct ctl_table ipv6_rotable[] = {
 133         {
 134                 .procname       = "mld_max_msf",
 135                 .data           = &sysctl_mld_max_msf,
 136                 .maxlen         = sizeof(int),
 137                 .mode           = 0644,
 138                 .proc_handler   = proc_dointvec
 139         },
 140         {
 141                 .procname       = "mld_qrv",
 142                 .data           = &sysctl_mld_qrv,
 143                 .maxlen         = sizeof(int),
 144                 .mode           = 0644,
 145                 .proc_handler   = proc_dointvec_minmax,
 146                 .extra1         = &one
 147         },
 148 #ifdef CONFIG_NETLABEL
 149         {
 150                 .procname       = "calipso_cache_enable",
 151                 .data           = &calipso_cache_enabled,
 152                 .maxlen         = sizeof(int),
 153                 .mode           = 0644,
 154                 .proc_handler   = proc_dointvec,
 155         },
 156         {
 157                 .procname       = "calipso_cache_bucket_size",
 158                 .data           = &calipso_cache_bucketsize,
 159                 .maxlen         = sizeof(int),
 160                 .mode           = 0644,
 161                 .proc_handler   = proc_dointvec,
 162         },
 163 #endif /* CONFIG_NETLABEL */
 164         { }
 165 };
 166
 167 static int __net_init ipv6_sysctl_net_init(struct net *net)
 168 {
 169         struct ctl_table *ipv6_table;
 170         struct ctl_table *ipv6_route_table;
 171         struct ctl_table *ipv6_icmp_table;
 172         int err;
 173
 174         err = -ENOMEM;
 175         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 176                              GFP_KERNEL);
 177         if (!ipv6_table)
 178                 goto out;
 179         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
 180         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
 181         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
 182         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
 183         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
 184         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
 185         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
 186         ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
 187         ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
 188         ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
 189         ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
 190         ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
 191         ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
 192         ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
 193
 194         ipv6_route_table = ipv6_route_sysctl_init(net);
 195         if (!ipv6_route_table)
 196                 goto out_ipv6_table;
 197
 198         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 199         if (!ipv6_icmp_table)
 200                 goto out_ipv6_route_table;
 201
 202         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 203         if (!net->ipv6.sysctl.hdr)
 204                 goto out_ipv6_icmp_table;
 205
 206         net->ipv6.sysctl.route_hdr =
 207                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 208         if (!net->ipv6.sysctl.route_hdr)
 209                 goto out_unregister_ipv6_table;
 210
 211         net->ipv6.sysctl.icmp_hdr =
 212                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 213         if (!net->ipv6.sysctl.icmp_hdr)
 214                 goto out_unregister_route_table;
 215
 216         err = 0;
 217 out:
 218         return err;
 219 out_unregister_route_table:
 220         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 221 out_unregister_ipv6_table:
 222         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 223 out_ipv6_icmp_table:
 224         kfree(ipv6_icmp_table);
 225 out_ipv6_route_table:
 226         kfree(ipv6_route_table);
 227 out_ipv6_table:
 228         kfree(ipv6_table);
 229         goto out;
 230 }
 231
 232 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 233 {
 234         struct ctl_table *ipv6_table;
 235         struct ctl_table *ipv6_route_table;
 236         struct ctl_table *ipv6_icmp_table;
 237
 238         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 239         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 240         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 241
 242         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 243         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 244         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 245
 246         kfree(ipv6_table);
 247         kfree(ipv6_route_table);
 248         kfree(ipv6_icmp_table);
 249 }
 250
 251 static struct pernet_operations ipv6_sysctl_net_ops = {
 252         .init = ipv6_sysctl_net_init,
 253         .exit = ipv6_sysctl_net_exit,
 254 };
 255
 256 static struct ctl_table_header *ip6_header;
 257
 258 int ipv6_sysctl_register(void)
 259 {
 260         int err = -ENOMEM;
 261
 262         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 263         if (!ip6_header)
 264                 goto out;
 265
 266         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 267         if (err)
 268                 goto err_pernet;
 269 out:
 270         return err;
 271
 272 err_pernet:
 273         unregister_net_sysctl_table(ip6_header);
 274         goto out;
 275 }
 276
 277 void ipv6_sysctl_unregister(void)
 278 {
 279         unregister_net_sysctl_table(ip6_header);
 280         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 281 }