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