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