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