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 flowlabel_reflect_max = 0x7;
  27 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
  28 static u32 rt6_multipath_hash_fields_all_mask =
  29         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  30 static u32 ioam6_id_max = IOAM6_DEFAULT_ID;
  31 static u64 ioam6_id_wide_max = IOAM6_DEFAULT_ID_WIDE;
  32
  33 static int proc_rt6_multipath_hash_policy(const struct ctl_table *table, int write,
  34                                           void *buffer, size_t *lenp, loff_t *ppos)
  35 {
  36         struct net *net;
  37         int ret;
  38
  39         net = container_of(table->data, struct net,
  40                            ipv6.sysctl.multipath_hash_policy);
  41         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
  42         if (write && ret == 0)
  43                 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
  44
  45         return ret;
  46 }
  47
  48 static int
  49 proc_rt6_multipath_hash_fields(const struct ctl_table *table, int write, void *buffer,
  50                                size_t *lenp, loff_t *ppos)
  51 {
  52         struct net *net;
  53         int ret;
  54
  55         net = container_of(table->data, struct net,
  56                            ipv6.sysctl.multipath_hash_fields);
  57         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
  58         if (write && ret == 0)
  59                 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
  60
  61         return ret;
  62 }
  63
  64 static struct ctl_table ipv6_table_template[] = {
  65         {
  66                 .procname       = "bindv6only",
  67                 .data           = &init_net.ipv6.sysctl.bindv6only,
  68                 .maxlen         = sizeof(u8),
  69                 .mode           = 0644,
  70                 .proc_handler   = proc_dou8vec_minmax,
  71         },
  72         {
  73                 .procname       = "anycast_src_echo_reply",
  74                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  75                 .maxlen         = sizeof(u8),
  76                 .mode           = 0644,
  77                 .proc_handler   = proc_dou8vec_minmax,
  78         },
  79         {
  80                 .procname       = "flowlabel_consistency",
  81                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  82                 .maxlen         = sizeof(u8),
  83                 .mode           = 0644,
  84                 .proc_handler   = proc_dou8vec_minmax,
  85         },
  86         {
  87                 .procname       = "auto_flowlabels",
  88                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  89                 .maxlen         = sizeof(u8),
  90                 .mode           = 0644,
  91                 .proc_handler   = proc_dou8vec_minmax,
  92                 .extra2         = &auto_flowlabels_max
  93         },
  94         {
  95                 .procname       = "fwmark_reflect",
  96                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  97                 .maxlen         = sizeof(u8),
  98                 .mode           = 0644,
  99                 .proc_handler   = proc_dou8vec_minmax,
 100         },
 101         {
 102                 .procname       = "idgen_retries",
 103                 .data           = &init_net.ipv6.sysctl.idgen_retries,
 104                 .maxlen         = sizeof(int),
 105                 .mode           = 0644,
 106                 .proc_handler   = proc_dointvec,
 107         },
 108         {
 109                 .procname       = "idgen_delay",
 110                 .data           = &init_net.ipv6.sysctl.idgen_delay,
 111                 .maxlen         = sizeof(int),
 112                 .mode           = 0644,
 113                 .proc_handler   = proc_dointvec_jiffies,
 114         },
 115         {
 116                 .procname       = "flowlabel_state_ranges",
 117                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
 118                 .maxlen         = sizeof(u8),
 119                 .mode           = 0644,
 120                 .proc_handler   = proc_dou8vec_minmax,
 121         },
 122         {
 123                 .procname       = "ip_nonlocal_bind",
 124                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
 125                 .maxlen         = sizeof(u8),
 126                 .mode           = 0644,
 127                 .proc_handler   = proc_dou8vec_minmax,
 128         },
 129         {
 130                 .procname       = "flowlabel_reflect",
 131                 .data           = &init_net.ipv6.sysctl.flowlabel_reflect,
 132                 .maxlen         = sizeof(int),
 133                 .mode           = 0644,
 134                 .proc_handler   = proc_dointvec_minmax,
 135                 .extra1         = SYSCTL_ZERO,
 136                 .extra2         = &flowlabel_reflect_max,
 137         },
 138         {
 139                 .procname       = "max_dst_opts_number",
 140                 .data           = &init_net.ipv6.sysctl.max_dst_opts_cnt,
 141                 .maxlen         = sizeof(int),
 142                 .mode           = 0644,
 143                 .proc_handler   = proc_dointvec
 144         },
 145         {
 146                 .procname       = "max_hbh_opts_number",
 147                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
 148                 .maxlen         = sizeof(int),
 149                 .mode           = 0644,
 150                 .proc_handler   = proc_dointvec
 151         },
 152         {
 153                 .procname       = "max_dst_opts_length",
 154                 .data           = &init_net.ipv6.sysctl.max_dst_opts_len,
 155                 .maxlen         = sizeof(int),
 156                 .mode           = 0644,
 157                 .proc_handler   = proc_dointvec
 158         },
 159         {
 160                 .procname       = "max_hbh_length",
 161                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_len,
 162                 .maxlen         = sizeof(int),
 163                 .mode           = 0644,
 164                 .proc_handler   = proc_dointvec
 165         },
 166         {
 167                 .procname       = "fib_multipath_hash_policy",
 168                 .data           = &init_net.ipv6.sysctl.multipath_hash_policy,
 169                 .maxlen         = sizeof(u8),
 170                 .mode           = 0644,
 171                 .proc_handler   = proc_rt6_multipath_hash_policy,
 172                 .extra1         = SYSCTL_ZERO,
 173                 .extra2         = SYSCTL_THREE,
 174         },
 175         {
 176                 .procname       = "fib_multipath_hash_fields",
 177                 .data           = &init_net.ipv6.sysctl.multipath_hash_fields,
 178                 .maxlen         = sizeof(u32),
 179                 .mode           = 0644,
 180                 .proc_handler   = proc_rt6_multipath_hash_fields,
 181                 .extra1         = SYSCTL_ONE,
 182                 .extra2         = &rt6_multipath_hash_fields_all_mask,
 183         },
 184         {
 185                 .procname       = "seg6_flowlabel",
 186                 .data           = &init_net.ipv6.sysctl.seg6_flowlabel,
 187                 .maxlen         = sizeof(int),
 188                 .mode           = 0644,
 189                 .proc_handler   = proc_dointvec
 190         },
 191         {
 192                 .procname       = "fib_notify_on_flag_change",
 193                 .data           = &init_net.ipv6.sysctl.fib_notify_on_flag_change,
 194                 .maxlen         = sizeof(u8),
 195                 .mode           = 0644,
 196                 .proc_handler   = proc_dou8vec_minmax,
 197                 .extra1         = SYSCTL_ZERO,
 198                 .extra2         = SYSCTL_TWO,
 199         },
 200         {
 201                 .procname       = "ioam6_id",
 202                 .data           = &init_net.ipv6.sysctl.ioam6_id,
 203                 .maxlen         = sizeof(u32),
 204                 .mode           = 0644,
 205                 .proc_handler   = proc_douintvec_minmax,
 206                 .extra2         = &ioam6_id_max,
 207         },
 208         {
 209                 .procname       = "ioam6_id_wide",
 210                 .data           = &init_net.ipv6.sysctl.ioam6_id_wide,
 211                 .maxlen         = sizeof(u64),
 212                 .mode           = 0644,
 213                 .proc_handler   = proc_doulongvec_minmax,
 214                 .extra2         = &ioam6_id_wide_max,
 215         },
 216 };
 217
 218 static struct ctl_table ipv6_rotable[] = {
 219         {
 220                 .procname       = "mld_max_msf",
 221                 .data           = &sysctl_mld_max_msf,
 222                 .maxlen         = sizeof(int),
 223                 .mode           = 0644,
 224                 .proc_handler   = proc_dointvec
 225         },
 226         {
 227                 .procname       = "mld_qrv",
 228                 .data           = &sysctl_mld_qrv,
 229                 .maxlen         = sizeof(int),
 230                 .mode           = 0644,
 231                 .proc_handler   = proc_dointvec_minmax,
 232                 .extra1         = SYSCTL_ONE
 233         },
 234 #ifdef CONFIG_NETLABEL
 235         {
 236                 .procname       = "calipso_cache_enable",
 237                 .data           = &calipso_cache_enabled,
 238                 .maxlen         = sizeof(int),
 239                 .mode           = 0644,
 240                 .proc_handler   = proc_dointvec,
 241         },
 242         {
 243                 .procname       = "calipso_cache_bucket_size",
 244                 .data           = &calipso_cache_bucketsize,
 245                 .maxlen         = sizeof(int),
 246                 .mode           = 0644,
 247                 .proc_handler   = proc_dointvec,
 248         },
 249 #endif /* CONFIG_NETLABEL */
 250 };
 251
 252 static int __net_init ipv6_sysctl_net_init(struct net *net)
 253 {
 254         size_t table_size = ARRAY_SIZE(ipv6_table_template);
 255         struct ctl_table *ipv6_table;
 256         struct ctl_table *ipv6_route_table;
 257         struct ctl_table *ipv6_icmp_table;
 258         int err, i;
 259
 260         err = -ENOMEM;
 261         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 262                              GFP_KERNEL);
 263         if (!ipv6_table)
 264                 goto out;
 265         /* Update the variables to point into the current struct net */
 266         for (i = 0; i < table_size; i++)
 267                 ipv6_table[i].data += (void *)net - (void *)&init_net;
 268
 269         ipv6_route_table = ipv6_route_sysctl_init(net);
 270         if (!ipv6_route_table)
 271                 goto out_ipv6_table;
 272
 273         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 274         if (!ipv6_icmp_table)
 275                 goto out_ipv6_route_table;
 276
 277         net->ipv6.sysctl.hdr = register_net_sysctl_sz(net, "net/ipv6",
 278                                                       ipv6_table, table_size);
 279         if (!net->ipv6.sysctl.hdr)
 280                 goto out_ipv6_icmp_table;
 281
 282         net->ipv6.sysctl.route_hdr = register_net_sysctl_sz(net,
 283                                                             "net/ipv6/route",
 284                                                             ipv6_route_table,
 285                                                             ipv6_route_sysctl_table_size(net));
 286         if (!net->ipv6.sysctl.route_hdr)
 287                 goto out_unregister_ipv6_table;
 288
 289         net->ipv6.sysctl.icmp_hdr = register_net_sysctl_sz(net,
 290                                                            "net/ipv6/icmp",
 291                                                            ipv6_icmp_table,
 292                                                            ipv6_icmp_sysctl_table_size());
 293         if (!net->ipv6.sysctl.icmp_hdr)
 294                 goto out_unregister_route_table;
 295
 296         err = 0;
 297 out:
 298         return err;
 299 out_unregister_route_table:
 300         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 301 out_unregister_ipv6_table:
 302         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 303 out_ipv6_icmp_table:
 304         kfree(ipv6_icmp_table);
 305 out_ipv6_route_table:
 306         kfree(ipv6_route_table);
 307 out_ipv6_table:
 308         kfree(ipv6_table);
 309         goto out;
 310 }
 311
 312 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 313 {
 314         const struct ctl_table *ipv6_table;
 315         const struct ctl_table *ipv6_route_table;
 316         const struct ctl_table *ipv6_icmp_table;
 317
 318         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 319         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 320         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 321
 322         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 323         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 324         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 325
 326         kfree(ipv6_table);
 327         kfree(ipv6_route_table);
 328         kfree(ipv6_icmp_table);
 329 }
 330
 331 static struct pernet_operations ipv6_sysctl_net_ops = {
 332         .init = ipv6_sysctl_net_init,
 333         .exit = ipv6_sysctl_net_exit,
 334 };
 335
 336 static struct ctl_table_header *ip6_header;
 337
 338 int ipv6_sysctl_register(void)
 339 {
 340         int err = -ENOMEM;
 341
 342         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 343         if (!ip6_header)
 344                 goto out;
 345
 346         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 347         if (err)
 348                 goto err_pernet;
 349 out:
 350         return err;
 351
 352 err_pernet:
 353         unregister_net_sysctl_table(ip6_header);
 354         goto out;
 355 }
 356
 357 void ipv6_sysctl_unregister(void)
 358 {
 359         unregister_net_sysctl_table(ip6_header);
 360         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 361 }