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 two = 2;
  25 static int flowlabel_reflect_max = 0x7;
  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_dou8vec_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(u8),
  48                 .mode           = 0644,
  49                 .proc_handler   = proc_dou8vec_minmax,
  50         },
  51         {
  52                 .procname       = "anycast_src_echo_reply",
  53                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  54                 .maxlen         = sizeof(u8),
  55                 .mode           = 0644,
  56                 .proc_handler   = proc_dou8vec_minmax,
  57         },
  58         {
  59                 .procname       = "flowlabel_consistency",
  60                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  61                 .maxlen         = sizeof(u8),
  62                 .mode           = 0644,
  63                 .proc_handler   = proc_dou8vec_minmax,
  64         },
  65         {
  66                 .procname       = "auto_flowlabels",
  67                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  68                 .maxlen         = sizeof(u8),
  69                 .mode           = 0644,
  70                 .proc_handler   = proc_dou8vec_minmax,
  71                 .extra2         = &auto_flowlabels_max
  72         },
  73         {
  74                 .procname       = "fwmark_reflect",
  75                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  76                 .maxlen         = sizeof(u8),
  77                 .mode           = 0644,
  78                 .proc_handler   = proc_dou8vec_minmax,
  79         },
  80         {
  81                 .procname       = "idgen_retries",
  82                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  83                 .maxlen         = sizeof(int),
  84                 .mode           = 0644,
  85                 .proc_handler   = proc_dointvec,
  86         },
  87         {
  88                 .procname       = "idgen_delay",
  89                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  90                 .maxlen         = sizeof(int),
  91                 .mode           = 0644,
  92                 .proc_handler   = proc_dointvec_jiffies,
  93         },
  94         {
  95                 .procname       = "flowlabel_state_ranges",
  96                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
  97                 .maxlen         = sizeof(u8),
  98                 .mode           = 0644,
  99                 .proc_handler   = proc_dou8vec_minmax,
 100         },
 101         {
 102                 .procname       = "ip_nonlocal_bind",
 103                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
 104                 .maxlen         = sizeof(u8),
 105                 .mode           = 0644,
 106                 .proc_handler   = proc_dou8vec_minmax,
 107         },
 108         {
 109                 .procname       = "flowlabel_reflect",
 110                 .data           = &init_net.ipv6.sysctl.flowlabel_reflect,
 111                 .maxlen         = sizeof(int),
 112                 .mode           = 0644,
 113                 .proc_handler   = proc_dointvec_minmax,
 114                 .extra1         = SYSCTL_ZERO,
 115                 .extra2         = &flowlabel_reflect_max,
 116         },
 117         {
 118                 .procname       = "max_dst_opts_number",
 119                 .data           = &init_net.ipv6.sysctl.max_dst_opts_cnt,
 120                 .maxlen         = sizeof(int),
 121                 .mode           = 0644,
 122                 .proc_handler   = proc_dointvec
 123         },
 124         {
 125                 .procname       = "max_hbh_opts_number",
 126                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
 127                 .maxlen         = sizeof(int),
 128                 .mode           = 0644,
 129                 .proc_handler   = proc_dointvec
 130         },
 131         {
 132                 .procname       = "max_dst_opts_length",
 133                 .data           = &init_net.ipv6.sysctl.max_dst_opts_len,
 134                 .maxlen         = sizeof(int),
 135                 .mode           = 0644,
 136                 .proc_handler   = proc_dointvec
 137         },
 138         {
 139                 .procname       = "max_hbh_length",
 140                 .data           = &init_net.ipv6.sysctl.max_hbh_opts_len,
 141                 .maxlen         = sizeof(int),
 142                 .mode           = 0644,
 143                 .proc_handler   = proc_dointvec
 144         },
 145         {
 146                 .procname       = "fib_multipath_hash_policy",
 147                 .data           = &init_net.ipv6.sysctl.multipath_hash_policy,
 148                 .maxlen         = sizeof(u8),
 149                 .mode           = 0644,
 150                 .proc_handler   = proc_rt6_multipath_hash_policy,
 151                 .extra1         = SYSCTL_ZERO,
 152                 .extra2         = &two,
 153         },
 154         {
 155                 .procname       = "seg6_flowlabel",
 156                 .data           = &init_net.ipv6.sysctl.seg6_flowlabel,
 157                 .maxlen         = sizeof(int),
 158                 .mode           = 0644,
 159                 .proc_handler   = proc_dointvec
 160         },
 161         {
 162                 .procname       = "fib_notify_on_flag_change",
 163                 .data           = &init_net.ipv6.sysctl.fib_notify_on_flag_change,
 164                 .maxlen         = sizeof(u8),
 165                 .mode           = 0644,
 166                 .proc_handler   = proc_dou8vec_minmax,
 167                 .extra1         = SYSCTL_ZERO,
 168                 .extra2         = &two,
 169         },
 170         { }
 171 };
 172
 173 static struct ctl_table ipv6_rotable[] = {
 174         {
 175                 .procname       = "mld_max_msf",
 176                 .data           = &sysctl_mld_max_msf,
 177                 .maxlen         = sizeof(int),
 178                 .mode           = 0644,
 179                 .proc_handler   = proc_dointvec
 180         },
 181         {
 182                 .procname       = "mld_qrv",
 183                 .data           = &sysctl_mld_qrv,
 184                 .maxlen         = sizeof(int),
 185                 .mode           = 0644,
 186                 .proc_handler   = proc_dointvec_minmax,
 187                 .extra1         = SYSCTL_ONE
 188         },
 189 #ifdef CONFIG_NETLABEL
 190         {
 191                 .procname       = "calipso_cache_enable",
 192                 .data           = &calipso_cache_enabled,
 193                 .maxlen         = sizeof(int),
 194                 .mode           = 0644,
 195                 .proc_handler   = proc_dointvec,
 196         },
 197         {
 198                 .procname       = "calipso_cache_bucket_size",
 199                 .data           = &calipso_cache_bucketsize,
 200                 .maxlen         = sizeof(int),
 201                 .mode           = 0644,
 202                 .proc_handler   = proc_dointvec,
 203         },
 204 #endif /* CONFIG_NETLABEL */
 205         { }
 206 };
 207
 208 static int __net_init ipv6_sysctl_net_init(struct net *net)
 209 {
 210         struct ctl_table *ipv6_table;
 211         struct ctl_table *ipv6_route_table;
 212         struct ctl_table *ipv6_icmp_table;
 213         int err, i;
 214
 215         err = -ENOMEM;
 216         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 217                              GFP_KERNEL);
 218         if (!ipv6_table)
 219                 goto out;
 220         /* Update the variables to point into the current struct net */
 221         for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++)
 222                 ipv6_table[i].data += (void *)net - (void *)&init_net;
 223
 224         ipv6_route_table = ipv6_route_sysctl_init(net);
 225         if (!ipv6_route_table)
 226                 goto out_ipv6_table;
 227
 228         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 229         if (!ipv6_icmp_table)
 230                 goto out_ipv6_route_table;
 231
 232         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 233         if (!net->ipv6.sysctl.hdr)
 234                 goto out_ipv6_icmp_table;
 235
 236         net->ipv6.sysctl.route_hdr =
 237                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 238         if (!net->ipv6.sysctl.route_hdr)
 239                 goto out_unregister_ipv6_table;
 240
 241         net->ipv6.sysctl.icmp_hdr =
 242                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 243         if (!net->ipv6.sysctl.icmp_hdr)
 244                 goto out_unregister_route_table;
 245
 246         err = 0;
 247 out:
 248         return err;
 249 out_unregister_route_table:
 250         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 251 out_unregister_ipv6_table:
 252         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 253 out_ipv6_icmp_table:
 254         kfree(ipv6_icmp_table);
 255 out_ipv6_route_table:
 256         kfree(ipv6_route_table);
 257 out_ipv6_table:
 258         kfree(ipv6_table);
 259         goto out;
 260 }
 261
 262 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 263 {
 264         struct ctl_table *ipv6_table;
 265         struct ctl_table *ipv6_route_table;
 266         struct ctl_table *ipv6_icmp_table;
 267
 268         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 269         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 270         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 271
 272         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 273         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 274         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 275
 276         kfree(ipv6_table);
 277         kfree(ipv6_route_table);
 278         kfree(ipv6_icmp_table);
 279 }
 280
 281 static struct pernet_operations ipv6_sysctl_net_ops = {
 282         .init = ipv6_sysctl_net_init,
 283         .exit = ipv6_sysctl_net_exit,
 284 };
 285
 286 static struct ctl_table_header *ip6_header;
 287
 288 int ipv6_sysctl_register(void)
 289 {
 290         int err = -ENOMEM;
 291
 292         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 293         if (!ip6_header)
 294                 goto out;
 295
 296         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 297         if (err)
 298                 goto err_pernet;
 299 out:
 300         return err;
 301
 302 err_pernet:
 303         unregister_net_sysctl_table(ip6_header);
 304         goto out;
 305 }
 306
 307 void ipv6_sysctl_unregister(void)
 308 {
 309         unregister_net_sysctl_table(ip6_header);
 310         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 311 }