kernel/net/ipv6/sysctl_net_ipv6.c

   1 /*
   2  * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
   3  *
   4  * Changes:
   5  * YOSHIFUJI Hideaki @USAGI:    added icmp sysctl table.
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/sysctl.h>
  10 #include <linux/in6.h>
  11 #include <linux/ipv6.h>
  12 #include <linux/slab.h>
  13 #include <linux/export.h>
  14 #include <net/ndisc.h>
  15 #include <net/ipv6.h>
  16 #include <net/addrconf.h>
  17 #include <net/inet_frag.h>
  18
  19 static int one = 1;
  20 static int auto_flowlabels_min;
  21 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
  22
  23
  24 static struct ctl_table ipv6_table_template[] = {
  25         {
  26                 .procname       = "bindv6only",
  27                 .data           = &init_net.ipv6.sysctl.bindv6only,
  28                 .maxlen         = sizeof(int),
  29                 .mode           = 0644,
  30                 .proc_handler   = proc_dointvec
  31         },
  32         {
  33                 .procname       = "anycast_src_echo_reply",
  34                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  35                 .maxlen         = sizeof(int),
  36                 .mode           = 0644,
  37                 .proc_handler   = proc_dointvec
  38         },
  39         {
  40                 .procname       = "flowlabel_consistency",
  41                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  42                 .maxlen         = sizeof(int),
  43                 .mode           = 0644,
  44                 .proc_handler   = proc_dointvec
  45         },
  46         {
  47                 .procname       = "auto_flowlabels",
  48                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  49                 .maxlen         = sizeof(int),
  50                 .mode           = 0644,
  51                 .proc_handler   = proc_dointvec_minmax,
  52                 .extra1         = &auto_flowlabels_min,
  53                 .extra2         = &auto_flowlabels_max
  54         },
  55         {
  56                 .procname       = "fwmark_reflect",
  57                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  58                 .maxlen         = sizeof(int),
  59                 .mode           = 0644,
  60                 .proc_handler   = proc_dointvec
  61         },
  62         {
  63                 .procname       = "idgen_retries",
  64                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  65                 .maxlen         = sizeof(int),
  66                 .mode           = 0644,
  67                 .proc_handler   = proc_dointvec,
  68         },
  69         {
  70                 .procname       = "idgen_delay",
  71                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  72                 .maxlen         = sizeof(int),
  73                 .mode           = 0644,
  74                 .proc_handler   = proc_dointvec_jiffies,
  75         },
  76         {
  77                 .procname       = "flowlabel_state_ranges",
  78                 .data           = &init_net.ipv6.sysctl.flowlabel_state_ranges,
  79                 .maxlen         = sizeof(int),
  80                 .mode           = 0644,
  81                 .proc_handler   = proc_dointvec
  82         },
  83         {
  84                 .procname       = "ip_nonlocal_bind",
  85                 .data           = &init_net.ipv6.sysctl.ip_nonlocal_bind,
  86                 .maxlen         = sizeof(int),
  87                 .mode           = 0644,
  88                 .proc_handler   = proc_dointvec
  89         },
  90         { }
  91 };
  92
  93 static struct ctl_table ipv6_rotable[] = {
  94         {
  95                 .procname       = "mld_max_msf",
  96                 .data           = &sysctl_mld_max_msf,
  97                 .maxlen         = sizeof(int),
  98                 .mode           = 0644,
  99                 .proc_handler   = proc_dointvec
 100         },
 101         {
 102                 .procname       = "mld_qrv",
 103                 .data           = &sysctl_mld_qrv,
 104                 .maxlen         = sizeof(int),
 105                 .mode           = 0644,
 106                 .proc_handler   = proc_dointvec_minmax,
 107                 .extra1         = &one
 108         },
 109         { }
 110 };
 111
 112 static int __net_init ipv6_sysctl_net_init(struct net *net)
 113 {
 114         struct ctl_table *ipv6_table;
 115         struct ctl_table *ipv6_route_table;
 116         struct ctl_table *ipv6_icmp_table;
 117         int err;
 118
 119         err = -ENOMEM;
 120         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 121                              GFP_KERNEL);
 122         if (!ipv6_table)
 123                 goto out;
 124         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
 125         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
 126         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
 127         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
 128         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
 129         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
 130         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
 131         ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
 132         ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
 133
 134         ipv6_route_table = ipv6_route_sysctl_init(net);
 135         if (!ipv6_route_table)
 136                 goto out_ipv6_table;
 137
 138         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 139         if (!ipv6_icmp_table)
 140                 goto out_ipv6_route_table;
 141
 142         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 143         if (!net->ipv6.sysctl.hdr)
 144                 goto out_ipv6_icmp_table;
 145
 146         net->ipv6.sysctl.route_hdr =
 147                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 148         if (!net->ipv6.sysctl.route_hdr)
 149                 goto out_unregister_ipv6_table;
 150
 151         net->ipv6.sysctl.icmp_hdr =
 152                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 153         if (!net->ipv6.sysctl.icmp_hdr)
 154                 goto out_unregister_route_table;
 155
 156         err = 0;
 157 out:
 158         return err;
 159 out_unregister_route_table:
 160         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 161 out_unregister_ipv6_table:
 162         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 163 out_ipv6_icmp_table:
 164         kfree(ipv6_icmp_table);
 165 out_ipv6_route_table:
 166         kfree(ipv6_route_table);
 167 out_ipv6_table:
 168         kfree(ipv6_table);
 169         goto out;
 170 }
 171
 172 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 173 {
 174         struct ctl_table *ipv6_table;
 175         struct ctl_table *ipv6_route_table;
 176         struct ctl_table *ipv6_icmp_table;
 177
 178         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 179         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 180         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 181
 182         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 183         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 184         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 185
 186         kfree(ipv6_table);
 187         kfree(ipv6_route_table);
 188         kfree(ipv6_icmp_table);
 189 }
 190
 191 static struct pernet_operations ipv6_sysctl_net_ops = {
 192         .init = ipv6_sysctl_net_init,
 193         .exit = ipv6_sysctl_net_exit,
 194 };
 195
 196 static struct ctl_table_header *ip6_header;
 197
 198 int ipv6_sysctl_register(void)
 199 {
 200         int err = -ENOMEM;
 201
 202         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 203         if (!ip6_header)
 204                 goto out;
 205
 206         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 207         if (err)
 208                 goto err_pernet;
 209 out:
 210         return err;
 211
 212 err_pernet:
 213         unregister_net_sysctl_table(ip6_header);
 214         goto out;
 215 }
 216
 217 void ipv6_sysctl_unregister(void)
 218 {
 219         unregister_net_sysctl_table(ip6_header);
 220         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 221 }