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 zero;
  25 static int one = 1;
  26 static int auto_flowlabels_min;
  27 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
  28
  29 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
  30                                           void __user *buffer, size_t *lenp,
  31                                           loff_t *ppos)
  32 {
  33         struct net *net;
  34         int ret;
  35
  36         net = container_of(table->data, struct net,
  37                            ipv6.sysctl.multipath_hash_policy);
  38         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
  39         if (write && ret == 0)
  40                 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
  41
  42         return ret;
  43 }
  44
  45 static struct ctl_table ipv6_table_template[] = {
  46         {
  47                 .procname       = "bindv6only",
  48                 .data           = &init_net.ipv6.sysctl.bindv6only,
  49                 .maxlen         = sizeof(int),
  50                 .mode           = 0644,
  51                 .proc_handler   = proc_dointvec
  52         },
  53         {
  54                 .procname       = "anycast_src_echo_reply",
  55                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  56                 .maxlen         = sizeof(int),
  57                 .mode           = 0644,
  58                 .proc_handler   = proc_dointvec
  59         },
  60         {
  61                 .procname       = "flowlabel_consistency",
  62                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  63                 .maxlen         = sizeof(int),
  64                 .mode           = 0644,
  65                 .proc_handler   = proc_dointvec
  66         },
  67         {
  68                 .procname       = "auto_flowlabels",
  69                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  70                 .maxlen         = sizeof(int),
  71                 .mode           = 0644,
  72                 .proc_handler   = proc_dointvec_minmax,
  73                 .extra1         = &auto_flowlabels_min,
  74                 .extra2         = &auto_flowlabels_max
  75         },
  76         {
  77                 .procname       = "fwmark_reflect",
  78                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  79                 .maxlen         = sizeof(int),
  80                 .mode           = 0644,
  81                 .proc_handler   = proc_dointvec
  82         },
  83         {
  84                 .procname       = "idgen_retries",
  85                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  86                 .maxlen         = sizeof(int),
  87                 .mode           = 0644,
  88                 .proc_handler   = proc_dointvec,
  89         },
  90         {
  91                 .procname       = "idgen_delay",
  92                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  93                 .maxlen         = sizeof(int),
  94                 .mode           = 0644,
  95                 .proc_handler   = proc_dointvec_jiffies,
  96         },
  97         {
  98                 .procname       = "flowlabel_state_ranges",
  99                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
 100                 .maxlen         = sizeof(int),
 101                 .mode           = 0644,
 102                 .proc_handler   = proc_dointvec
 103         },
 104         {
 105                 .procname       = "ip_nonlocal_bind",
 106                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
 107                 .maxlen         = sizeof(int),
 108                 .mode           = 0644,
 109                 .proc_handler   = proc_dointvec
 110         },
 111         {
 112                 .procname       = "flowlabel_reflect",
 113                 .data           = &init_net.ipv6.sysctl.flowlabel_reflect,
 114                 .maxlen         = sizeof(int),
 115                 .mode           = 0644,
 116                 .proc_handler   = proc_dointvec,
 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         = &zero,
 153                 .extra2         = &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         = &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;
 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         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
 213         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
 214         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
 215         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
 216         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
 217         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
 218         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
 219         ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
 220         ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
 221         ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
 222         ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
 223         ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
 224         ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
 225         ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
 226         ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
 227         ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
 228
 229         ipv6_route_table = ipv6_route_sysctl_init(net);
 230         if (!ipv6_route_table)
 231                 goto out_ipv6_table;
 232
 233         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 234         if (!ipv6_icmp_table)
 235                 goto out_ipv6_route_table;
 236
 237         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 238         if (!net->ipv6.sysctl.hdr)
 239                 goto out_ipv6_icmp_table;
 240
 241         net->ipv6.sysctl.route_hdr =
 242                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 243         if (!net->ipv6.sysctl.route_hdr)
 244                 goto out_unregister_ipv6_table;
 245
 246         net->ipv6.sysctl.icmp_hdr =
 247                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 248         if (!net->ipv6.sysctl.icmp_hdr)
 249                 goto out_unregister_route_table;
 250
 251         err = 0;
 252 out:
 253         return err;
 254 out_unregister_route_table:
 255         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 256 out_unregister_ipv6_table:
 257         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 258 out_ipv6_icmp_table:
 259         kfree(ipv6_icmp_table);
 260 out_ipv6_route_table:
 261         kfree(ipv6_route_table);
 262 out_ipv6_table:
 263         kfree(ipv6_table);
 264         goto out;
 265 }
 266
 267 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 268 {
 269         struct ctl_table *ipv6_table;
 270         struct ctl_table *ipv6_route_table;
 271         struct ctl_table *ipv6_icmp_table;
 272
 273         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 274         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 275         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 276
 277         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 278         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 279         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 280
 281         kfree(ipv6_table);
 282         kfree(ipv6_route_table);
 283         kfree(ipv6_icmp_table);
 284 }
 285
 286 static struct pernet_operations ipv6_sysctl_net_ops = {
 287         .init = ipv6_sysctl_net_init,
 288         .exit = ipv6_sysctl_net_exit,
 289 };
 290
 291 static struct ctl_table_header *ip6_header;
 292
 293 int ipv6_sysctl_register(void)
 294 {
 295         int err = -ENOMEM;
 296
 297         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 298         if (!ip6_header)
 299                 goto out;
 300
 301         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 302         if (err)
 303                 goto err_pernet;
 304 out:
 305         return err;
 306
 307 err_pernet:
 308         unregister_net_sysctl_table(ip6_header);
 309         goto out;
 310 }
 311
 312 void ipv6_sysctl_unregister(void)
 313 {
 314         unregister_net_sysctl_table(ip6_header);
 315         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 316 }