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 #include <net/netevent.h>
  20 #ifdef CONFIG_NETLABEL
  21 #include <net/calipso.h>
  22 #endif
  23
  24 static int zero;
  25 static int one = 1;
  26 static int flowlabel_reflect_max = 0x7;
  27 static int auto_flowlabels_min;
  28 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
  29
  30 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
  31                                           void __user *buffer, size_t *lenp,
  32                                           loff_t *ppos)
  33 {
  34         struct net *net;
  35         int ret;
  36
  37         net = container_of(table->data, struct net,
  38                            ipv6.sysctl.multipath_hash_policy);
  39         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
  40         if (write && ret == 0)
  41                 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
  42
  43         return ret;
  44 }
  45
  46 static struct ctl_table ipv6_table_template[] = {
  47         {
  48                 .procname       = "bindv6only",
  49                 .data           = &init_net.ipv6.sysctl.bindv6only,
  50                 .maxlen         = sizeof(int),
  51                 .mode           = 0644,
  52                 .proc_handler   = proc_dointvec
  53         },
  54         {
  55                 .procname       = "anycast_src_echo_reply",
  56                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  57                 .maxlen         = sizeof(int),
  58                 .mode           = 0644,
  59                 .proc_handler   = proc_dointvec
  60         },
  61         {
  62                 .procname       = "flowlabel_consistency",
  63                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  64                 .maxlen         = sizeof(int),
  65                 .mode           = 0644,
  66                 .proc_handler   = proc_dointvec
  67         },
  68         {
  69                 .procname       = "auto_flowlabels",
  70                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  71                 .maxlen         = sizeof(int),
  72                 .mode           = 0644,
  73                 .proc_handler   = proc_dointvec_minmax,
  74                 .extra1         = &auto_flowlabels_min,
  75                 .extra2         = &auto_flowlabels_max
  76         },
  77         {
  78                 .procname       = "fwmark_reflect",
  79                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  80                 .maxlen         = sizeof(int),
  81                 .mode           = 0644,
  82                 .proc_handler   = proc_dointvec
  83         },
  84         {
  85                 .procname       = "idgen_retries",
  86                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  87                 .maxlen         = sizeof(int),
  88                 .mode           = 0644,
  89                 .proc_handler   = proc_dointvec,
  90         },
  91         {
  92                 .procname       = "idgen_delay",
  93                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  94                 .maxlen         = sizeof(int),
  95                 .mode           = 0644,
  96                 .proc_handler   = proc_dointvec_jiffies,
  97         },
  98         {
  99                 .procname       = "flowlabel_state_ranges",
 100                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
 101                 .maxlen         = sizeof(int),
 102                 .mode           = 0644,
 103                 .proc_handler   = proc_dointvec
 104         },
 105         {
 106                 .procname       = "ip_nonlocal_bind",
 107                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
 108                 .maxlen         = sizeof(int),
 109                 .mode           = 0644,
 110                 .proc_handler   = proc_dointvec
 111         },
 112         {
 113                 .procname       = "flowlabel_reflect",
 114                 .data           = &init_net.ipv6.sysctl.flowlabel_reflect,
 115                 .maxlen         = sizeof(int),
 116                 .mode           = 0644,
 117                 .proc_handler   = proc_dointvec_minmax,
 118                 .extra1         = &zero,
 119                 .extra2         = &flowlabel_reflect_max,
 120         },
 121         {
 122                 .procname       = "max_dst_opts_number",
 123                 .data           = &init_net.ipv6.sysctl.max_dst_opts_cnt,
 124                 .maxlen         = sizeof(int),
 125                 .mode           = 0644,
 126                 .proc_handler   = proc_dointvec
 127         },
 128         {
 129                 .procname       = "max_hbh_opts_number",
 130                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
 131                 .maxlen         = sizeof(int),
 132                 .mode           = 0644,
 133                 .proc_handler   = proc_dointvec
 134         },
 135         {
 136                 .procname       = "max_dst_opts_length",
 137                 .data           = &init_net.ipv6.sysctl.max_dst_opts_len,
 138                 .maxlen         = sizeof(int),
 139                 .mode           = 0644,
 140                 .proc_handler   = proc_dointvec
 141         },
 142         {
 143                 .procname       = "max_hbh_length",
 144                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_len,
 145                 .maxlen         = sizeof(int),
 146                 .mode           = 0644,
 147                 .proc_handler   = proc_dointvec
 148         },
 149         {
 150                 .procname       = "fib_multipath_hash_policy",
 151                 .data           = &init_net.ipv6.sysctl.multipath_hash_policy,
 152                 .maxlen         = sizeof(int),
 153                 .mode           = 0644,
 154                 .proc_handler   = proc_rt6_multipath_hash_policy,
 155                 .extra1         = &zero,
 156                 .extra2         = &one,
 157         },
 158         {
 159                 .procname       = "seg6_flowlabel",
 160                 .data           = &init_net.ipv6.sysctl.seg6_flowlabel,
 161                 .maxlen         = sizeof(int),
 162                 .mode           = 0644,
 163                 .proc_handler   = proc_dointvec
 164         },
 165         { }
 166 };
 167
 168 static struct ctl_table ipv6_rotable[] = {
 169         {
 170                 .procname       = "mld_max_msf",
 171                 .data           = &sysctl_mld_max_msf,
 172                 .maxlen         = sizeof(int),
 173                 .mode           = 0644,
 174                 .proc_handler   = proc_dointvec
 175         },
 176         {
 177                 .procname       = "mld_qrv",
 178                 .data           = &sysctl_mld_qrv,
 179                 .maxlen         = sizeof(int),
 180                 .mode           = 0644,
 181                 .proc_handler   = proc_dointvec_minmax,
 182                 .extra1         = &one
 183         },
 184 #ifdef CONFIG_NETLABEL
 185         {
 186                 .procname       = "calipso_cache_enable",
 187                 .data           = &calipso_cache_enabled,
 188                 .maxlen         = sizeof(int),
 189                 .mode           = 0644,
 190                 .proc_handler   = proc_dointvec,
 191         },
 192         {
 193                 .procname       = "calipso_cache_bucket_size",
 194                 .data           = &calipso_cache_bucketsize,
 195                 .maxlen         = sizeof(int),
 196                 .mode           = 0644,
 197                 .proc_handler   = proc_dointvec,
 198         },
 199 #endif /* CONFIG_NETLABEL */
 200         { }
 201 };
 202
 203 static int __net_init ipv6_sysctl_net_init(struct net *net)
 204 {
 205         struct ctl_table *ipv6_table;
 206         struct ctl_table *ipv6_route_table;
 207         struct ctl_table *ipv6_icmp_table;
 208         int err;
 209
 210         err = -ENOMEM;
 211         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 212                              GFP_KERNEL);
 213         if (!ipv6_table)
 214                 goto out;
 215         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
 216         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
 217         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
 218         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
 219         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
 220         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
 221         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
 222         ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
 223         ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
 224         ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
 225         ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
 226         ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
 227         ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
 228         ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
 229         ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
 230         ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
 231
 232         ipv6_route_table = ipv6_route_sysctl_init(net);
 233         if (!ipv6_route_table)
 234                 goto out_ipv6_table;
 235
 236         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 237         if (!ipv6_icmp_table)
 238                 goto out_ipv6_route_table;
 239
 240         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 241         if (!net->ipv6.sysctl.hdr)
 242                 goto out_ipv6_icmp_table;
 243
 244         net->ipv6.sysctl.route_hdr =
 245                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 246         if (!net->ipv6.sysctl.route_hdr)
 247                 goto out_unregister_ipv6_table;
 248
 249         net->ipv6.sysctl.icmp_hdr =
 250                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 251         if (!net->ipv6.sysctl.icmp_hdr)
 252                 goto out_unregister_route_table;
 253
 254         err = 0;
 255 out:
 256         return err;
 257 out_unregister_route_table:
 258         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 259 out_unregister_ipv6_table:
 260         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 261 out_ipv6_icmp_table:
 262         kfree(ipv6_icmp_table);
 263 out_ipv6_route_table:
 264         kfree(ipv6_route_table);
 265 out_ipv6_table:
 266         kfree(ipv6_table);
 267         goto out;
 268 }
 269
 270 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 271 {
 272         struct ctl_table *ipv6_table;
 273         struct ctl_table *ipv6_route_table;
 274         struct ctl_table *ipv6_icmp_table;
 275
 276         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 277         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 278         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 279
 280         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 281         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 282         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 283
 284         kfree(ipv6_table);
 285         kfree(ipv6_route_table);
 286         kfree(ipv6_icmp_table);
 287 }
 288
 289 static struct pernet_operations ipv6_sysctl_net_ops = {
 290         .init = ipv6_sysctl_net_init,
 291         .exit = ipv6_sysctl_net_exit,
 292 };
 293
 294 static struct ctl_table_header *ip6_header;
 295
 296 int ipv6_sysctl_register(void)
 297 {
 298         int err = -ENOMEM;
 299
 300         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 301         if (!ip6_header)
 302                 goto out;
 303
 304         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 305         if (err)
 306                 goto err_pernet;
 307 out:
 308         return err;
 309
 310 err_pernet:
 311         unregister_net_sysctl_table(ip6_header);
 312         goto out;
 313 }
 314
 315 void ipv6_sysctl_unregister(void)
 316 {
 317         unregister_net_sysctl_table(ip6_header);
 318         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 319 }