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 #ifdef CONFIG_NETLABEL
  20 #include <net/calipso.h>
  21 #endif
  22
  23 static int one = 1;
  24 static int auto_flowlabels_min;
  25 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
  26
  27
  28 static struct ctl_table ipv6_table_template[] = {
  29         {
  30                 .procname       = "bindv6only",
  31                 .data           = &init_net.ipv6.sysctl.bindv6only,
  32                 .maxlen         = sizeof(int),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_dointvec
  35         },
  36         {
  37                 .procname       = "anycast_src_echo_reply",
  38                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  39                 .maxlen         = sizeof(int),
  40                 .mode           = 0644,
  41                 .proc_handler   = proc_dointvec
  42         },
  43         {
  44                 .procname       = "flowlabel_consistency",
  45                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  46                 .maxlen         = sizeof(int),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec
  49         },
  50         {
  51                 .procname       = "auto_flowlabels",
  52                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  53                 .maxlen         = sizeof(int),
  54                 .mode           = 0644,
  55                 .proc_handler   = proc_dointvec_minmax,
  56                 .extra1         = &auto_flowlabels_min,
  57                 .extra2         = &auto_flowlabels_max
  58         },
  59         {
  60                 .procname       = "fwmark_reflect",
  61                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  62                 .maxlen         = sizeof(int),
  63                 .mode           = 0644,
  64                 .proc_handler   = proc_dointvec
  65         },
  66         {
  67                 .procname       = "idgen_retries",
  68                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  69                 .maxlen         = sizeof(int),
  70                 .mode           = 0644,
  71                 .proc_handler   = proc_dointvec,
  72         },
  73         {
  74                 .procname       = "idgen_delay",
  75                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  76                 .maxlen         = sizeof(int),
  77                 .mode           = 0644,
  78                 .proc_handler   = proc_dointvec_jiffies,
  79         },
  80         {
  81                 .procname       = "flowlabel_state_ranges",
  82                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
  83                 .maxlen         = sizeof(int),
  84                 .mode           = 0644,
  85                 .proc_handler   = proc_dointvec
  86         },
  87         {
  88                 .procname       = "ip_nonlocal_bind",
  89                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
  90                 .maxlen         = sizeof(int),
  91                 .mode           = 0644,
  92                 .proc_handler   = proc_dointvec
  93         },
  94         {
  95                 .procname       = "flowlabel_reflect",
  96                 .data           = &init_net.ipv6.sysctl.flowlabel_reflect,
  97                 .maxlen         = sizeof(int),
  98                 .mode           = 0644,
  99                 .proc_handler   = proc_dointvec,
 100         },
 101         { }
 102 };
 103
 104 static struct ctl_table ipv6_rotable[] = {
 105         {
 106                 .procname       = "mld_max_msf",
 107                 .data           = &sysctl_mld_max_msf,
 108                 .maxlen         = sizeof(int),
 109                 .mode           = 0644,
 110                 .proc_handler   = proc_dointvec
 111         },
 112         {
 113                 .procname       = "mld_qrv",
 114                 .data           = &sysctl_mld_qrv,
 115                 .maxlen         = sizeof(int),
 116                 .mode           = 0644,
 117                 .proc_handler   = proc_dointvec_minmax,
 118                 .extra1         = &one
 119         },
 120 #ifdef CONFIG_NETLABEL
 121         {
 122                 .procname       = "calipso_cache_enable",
 123                 .data           = &calipso_cache_enabled,
 124                 .maxlen         = sizeof(int),
 125                 .mode           = 0644,
 126                 .proc_handler   = proc_dointvec,
 127         },
 128         {
 129                 .procname       = "calipso_cache_bucket_size",
 130                 .data           = &calipso_cache_bucketsize,
 131                 .maxlen         = sizeof(int),
 132                 .mode           = 0644,
 133                 .proc_handler   = proc_dointvec,
 134         },
 135 #endif /* CONFIG_NETLABEL */
 136         { }
 137 };
 138
 139 static int __net_init ipv6_sysctl_net_init(struct net *net)
 140 {
 141         struct ctl_table *ipv6_table;
 142         struct ctl_table *ipv6_route_table;
 143         struct ctl_table *ipv6_icmp_table;
 144         int err;
 145
 146         err = -ENOMEM;
 147         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 148                              GFP_KERNEL);
 149         if (!ipv6_table)
 150                 goto out;
 151         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
 152         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
 153         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
 154         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
 155         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
 156         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
 157         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
 158         ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
 159         ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
 160         ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
 161
 162         ipv6_route_table = ipv6_route_sysctl_init(net);
 163         if (!ipv6_route_table)
 164                 goto out_ipv6_table;
 165
 166         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 167         if (!ipv6_icmp_table)
 168                 goto out_ipv6_route_table;
 169
 170         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 171         if (!net->ipv6.sysctl.hdr)
 172                 goto out_ipv6_icmp_table;
 173
 174         net->ipv6.sysctl.route_hdr =
 175                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 176         if (!net->ipv6.sysctl.route_hdr)
 177                 goto out_unregister_ipv6_table;
 178
 179         net->ipv6.sysctl.icmp_hdr =
 180                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 181         if (!net->ipv6.sysctl.icmp_hdr)
 182                 goto out_unregister_route_table;
 183
 184         err = 0;
 185 out:
 186         return err;
 187 out_unregister_route_table:
 188         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 189 out_unregister_ipv6_table:
 190         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 191 out_ipv6_icmp_table:
 192         kfree(ipv6_icmp_table);
 193 out_ipv6_route_table:
 194         kfree(ipv6_route_table);
 195 out_ipv6_table:
 196         kfree(ipv6_table);
 197         goto out;
 198 }
 199
 200 static void __net_exit ipv6_sysctl_net_exit(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
 206         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 207         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 208         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 209
 210         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 211         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 212         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 213
 214         kfree(ipv6_table);
 215         kfree(ipv6_route_table);
 216         kfree(ipv6_icmp_table);
 217 }
 218
 219 static struct pernet_operations ipv6_sysctl_net_ops = {
 220         .init = ipv6_sysctl_net_init,
 221         .exit = ipv6_sysctl_net_exit,
 222 };
 223
 224 static struct ctl_table_header *ip6_header;
 225
 226 int ipv6_sysctl_register(void)
 227 {
 228         int err = -ENOMEM;
 229
 230         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 231         if (!ip6_header)
 232                 goto out;
 233
 234         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 235         if (err)
 236                 goto err_pernet;
 237 out:
 238         return err;
 239
 240 err_pernet:
 241         unregister_net_sysctl_table(ip6_header);
 242         goto out;
 243 }
 244
 245 void ipv6_sysctl_unregister(void)
 246 {
 247         unregister_net_sysctl_table(ip6_header);
 248         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 249 }