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 #include <net/ip_fib.h>
  21 #ifdef CONFIG_NETLABEL
  22 #include <net/calipso.h>
  23 #endif
  24 #include <linux/ioam6.h>
  25
  26 static int two = 2;
  27 static int three = 3;
  28 static int flowlabel_reflect_max = 0x7;
  29 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
  30 static u32 rt6_multipath_hash_fields_all_mask =
  31         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  32 static u32 ioam6_id_max = IOAM6_DEFAULT_ID;
  33 static u64 ioam6_id_wide_max = IOAM6_DEFAULT_ID_WIDE;
  34
  35 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
  36                                           void *buffer, size_t *lenp, loff_t *ppos)
  37 {
  38         struct net *net;
  39         int ret;
  40
  41         net = container_of(table->data, struct net,
  42                            ipv6.sysctl.multipath_hash_policy);
  43         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
  44         if (write && ret == 0)
  45                 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
  46
  47         return ret;
  48 }
  49
  50 static int
  51 proc_rt6_multipath_hash_fields(struct ctl_table *table, int write, void *buffer,
  52                                size_t *lenp, loff_t *ppos)
  53 {
  54         struct net *net;
  55         int ret;
  56
  57         net = container_of(table->data, struct net,
  58                            ipv6.sysctl.multipath_hash_fields);
  59         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
  60         if (write && ret == 0)
  61                 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
  62
  63         return ret;
  64 }
  65
  66 static struct ctl_table ipv6_table_template[] = {
  67         {
  68                 .procname       = "bindv6only",
  69                 .data           = &init_net.ipv6.sysctl.bindv6only,
  70                 .maxlen         = sizeof(u8),
  71                 .mode           = 0644,
  72                 .proc_handler   = proc_dou8vec_minmax,
  73         },
  74         {
  75                 .procname       = "anycast_src_echo_reply",
  76                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  77                 .maxlen         = sizeof(u8),
  78                 .mode           = 0644,
  79                 .proc_handler   = proc_dou8vec_minmax,
  80         },
  81         {
  82                 .procname       = "flowlabel_consistency",
  83                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  84                 .maxlen         = sizeof(u8),
  85                 .mode           = 0644,
  86                 .proc_handler   = proc_dou8vec_minmax,
  87         },
  88         {
  89                 .procname       = "auto_flowlabels",
  90                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  91                 .maxlen         = sizeof(u8),
  92                 .mode           = 0644,
  93                 .proc_handler   = proc_dou8vec_minmax,
  94                 .extra2         = &auto_flowlabels_max
  95         },
  96         {
  97                 .procname       = "fwmark_reflect",
  98                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  99                 .maxlen         = sizeof(u8),
 100                 .mode           = 0644,
 101                 .proc_handler   = proc_dou8vec_minmax,
 102         },
 103         {
 104                 .procname       = "idgen_retries",
 105                 .data           = &init_net.ipv6.sysctl.idgen_retries,
 106                 .maxlen         = sizeof(int),
 107                 .mode           = 0644,
 108                 .proc_handler   = proc_dointvec,
 109         },
 110         {
 111                 .procname       = "idgen_delay",
 112                 .data           = &init_net.ipv6.sysctl.idgen_delay,
 113                 .maxlen         = sizeof(int),
 114                 .mode           = 0644,
 115                 .proc_handler   = proc_dointvec_jiffies,
 116         },
 117         {
 118                 .procname       = "flowlabel_state_ranges",
 119                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
 120                 .maxlen         = sizeof(u8),
 121                 .mode           = 0644,
 122                 .proc_handler   = proc_dou8vec_minmax,
 123         },
 124         {
 125                 .procname       = "ip_nonlocal_bind",
 126                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
 127                 .maxlen         = sizeof(u8),
 128                 .mode           = 0644,
 129                 .proc_handler   = proc_dou8vec_minmax,
 130         },
 131         {
 132                 .procname       = "flowlabel_reflect",
 133                 .data           = &init_net.ipv6.sysctl.flowlabel_reflect,
 134                 .maxlen         = sizeof(int),
 135                 .mode           = 0644,
 136                 .proc_handler   = proc_dointvec_minmax,
 137                 .extra1         = SYSCTL_ZERO,
 138                 .extra2         = &flowlabel_reflect_max,
 139         },
 140         {
 141                 .procname       = "max_dst_opts_number",
 142                 .data           = &init_net.ipv6.sysctl.max_dst_opts_cnt,
 143                 .maxlen         = sizeof(int),
 144                 .mode           = 0644,
 145                 .proc_handler   = proc_dointvec
 146         },
 147         {
 148                 .procname       = "max_hbh_opts_number",
 149                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
 150                 .maxlen         = sizeof(int),
 151                 .mode           = 0644,
 152                 .proc_handler   = proc_dointvec
 153         },
 154         {
 155                 .procname       = "max_dst_opts_length",
 156                 .data           = &init_net.ipv6.sysctl.max_dst_opts_len,
 157                 .maxlen         = sizeof(int),
 158                 .mode           = 0644,
 159                 .proc_handler   = proc_dointvec
 160         },
 161         {
 162                 .procname       = "max_hbh_length",
 163                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_len,
 164                 .maxlen         = sizeof(int),
 165                 .mode           = 0644,
 166                 .proc_handler   = proc_dointvec
 167         },
 168         {
 169                 .procname       = "fib_multipath_hash_policy",
 170                 .data           = &init_net.ipv6.sysctl.multipath_hash_policy,
 171                 .maxlen         = sizeof(u8),
 172                 .mode           = 0644,
 173                 .proc_handler   = proc_rt6_multipath_hash_policy,
 174                 .extra1         = SYSCTL_ZERO,
 175                 .extra2         = &three,
 176         },
 177         {
 178                 .procname       = "fib_multipath_hash_fields",
 179                 .data           = &init_net.ipv6.sysctl.multipath_hash_fields,
 180                 .maxlen         = sizeof(u32),
 181                 .mode           = 0644,
 182                 .proc_handler   = proc_rt6_multipath_hash_fields,
 183                 .extra1         = SYSCTL_ONE,
 184                 .extra2         = &rt6_multipath_hash_fields_all_mask,
 185         },
 186         {
 187                 .procname       = "seg6_flowlabel",
 188                 .data           = &init_net.ipv6.sysctl.seg6_flowlabel,
 189                 .maxlen         = sizeof(int),
 190                 .mode           = 0644,
 191                 .proc_handler   = proc_dointvec
 192         },
 193         {
 194                 .procname       = "fib_notify_on_flag_change",
 195                 .data           = &init_net.ipv6.sysctl.fib_notify_on_flag_change,
 196                 .maxlen         = sizeof(u8),
 197                 .mode           = 0644,
 198                 .proc_handler   = proc_dou8vec_minmax,
 199                 .extra1         = SYSCTL_ZERO,
 200                 .extra2         = &two,
 201         },
 202         {
 203                 .procname       = "ioam6_id",
 204                 .data           = &init_net.ipv6.sysctl.ioam6_id,
 205                 .maxlen         = sizeof(u32),
 206                 .mode           = 0644,
 207                 .proc_handler   = proc_douintvec_minmax,
 208                 .extra2         = &ioam6_id_max,
 209         },
 210         {
 211                 .procname       = "ioam6_id_wide",
 212                 .data           = &init_net.ipv6.sysctl.ioam6_id_wide,
 213                 .maxlen         = sizeof(u64),
 214                 .mode           = 0644,
 215                 .proc_handler   = proc_doulongvec_minmax,
 216                 .extra2         = &ioam6_id_wide_max,
 217         },
 218         { }
 219 };
 220
 221 static struct ctl_table ipv6_rotable[] = {
 222         {
 223                 .procname       = "mld_max_msf",
 224                 .data           = &sysctl_mld_max_msf,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = proc_dointvec
 228         },
 229         {
 230                 .procname       = "mld_qrv",
 231                 .data           = &sysctl_mld_qrv,
 232                 .maxlen         = sizeof(int),
 233                 .mode           = 0644,
 234                 .proc_handler   = proc_dointvec_minmax,
 235                 .extra1         = SYSCTL_ONE
 236         },
 237 #ifdef CONFIG_NETLABEL
 238         {
 239                 .procname       = "calipso_cache_enable",
 240                 .data           = &calipso_cache_enabled,
 241                 .maxlen         = sizeof(int),
 242                 .mode           = 0644,
 243                 .proc_handler   = proc_dointvec,
 244         },
 245         {
 246                 .procname       = "calipso_cache_bucket_size",
 247                 .data           = &calipso_cache_bucketsize,
 248                 .maxlen         = sizeof(int),
 249                 .mode           = 0644,
 250                 .proc_handler   = proc_dointvec,
 251         },
 252 #endif /* CONFIG_NETLABEL */
 253         { }
 254 };
 255
 256 static int __net_init ipv6_sysctl_net_init(struct net *net)
 257 {
 258         struct ctl_table *ipv6_table;
 259         struct ctl_table *ipv6_route_table;
 260         struct ctl_table *ipv6_icmp_table;
 261         int err, i;
 262
 263         err = -ENOMEM;
 264         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 265                              GFP_KERNEL);
 266         if (!ipv6_table)
 267                 goto out;
 268         /* Update the variables to point into the current struct net */
 269         for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++)
 270                 ipv6_table[i].data += (void *)net - (void *)&init_net;
 271
 272         ipv6_route_table = ipv6_route_sysctl_init(net);
 273         if (!ipv6_route_table)
 274                 goto out_ipv6_table;
 275
 276         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 277         if (!ipv6_icmp_table)
 278                 goto out_ipv6_route_table;
 279
 280         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 281         if (!net->ipv6.sysctl.hdr)
 282                 goto out_ipv6_icmp_table;
 283
 284         net->ipv6.sysctl.route_hdr =
 285                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 286         if (!net->ipv6.sysctl.route_hdr)
 287                 goto out_unregister_ipv6_table;
 288
 289         net->ipv6.sysctl.icmp_hdr =
 290                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 291         if (!net->ipv6.sysctl.icmp_hdr)
 292                 goto out_unregister_route_table;
 293
 294         err = 0;
 295 out:
 296         return err;
 297 out_unregister_route_table:
 298         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 299 out_unregister_ipv6_table:
 300         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 301 out_ipv6_icmp_table:
 302         kfree(ipv6_icmp_table);
 303 out_ipv6_route_table:
 304         kfree(ipv6_route_table);
 305 out_ipv6_table:
 306         kfree(ipv6_table);
 307         goto out;
 308 }
 309
 310 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 311 {
 312         struct ctl_table *ipv6_table;
 313         struct ctl_table *ipv6_route_table;
 314         struct ctl_table *ipv6_icmp_table;
 315
 316         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 317         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 318         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 319
 320         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 321         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 322         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 323
 324         kfree(ipv6_table);
 325         kfree(ipv6_route_table);
 326         kfree(ipv6_icmp_table);
 327 }
 328
 329 static struct pernet_operations ipv6_sysctl_net_ops = {
 330         .init = ipv6_sysctl_net_init,
 331         .exit = ipv6_sysctl_net_exit,
 332 };
 333
 334 static struct ctl_table_header *ip6_header;
 335
 336 int ipv6_sysctl_register(void)
 337 {
 338         int err = -ENOMEM;
 339
 340         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 341         if (!ip6_header)
 342                 goto out;
 343
 344         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 345         if (err)
 346                 goto err_pernet;
 347 out:
 348         return err;
 349
 350 err_pernet:
 351         unregister_net_sysctl_table(ip6_header);
 352         goto out;
 353 }
 354
 355 void ipv6_sysctl_unregister(void)
 356 {
 357         unregister_net_sysctl_table(ip6_header);
 358         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 359 }