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 };
  59
  60 static struct ctl_table ipv6_rotable[] = {
  61         {
  62                 .procname       = "mld_max_msf",
  63                 .data           = &sysctl_mld_max_msf,
  64                 .maxlen         = sizeof(int),
  65                 .mode           = 0644,
  66                 .proc_handler   = proc_dointvec
  67         },
  68         {
  69                 .procname       = "mld_qrv",
  70                 .data           = &sysctl_mld_qrv,
  71                 .maxlen         = sizeof(int),
  72                 .mode           = 0644,
  73                 .proc_handler   = proc_dointvec_minmax,
  74                 .extra1         = &one
  75         },
  76         { }
  77 };
  78
  79 static int __net_init ipv6_sysctl_net_init(struct net *net)
  80 {
  81         struct ctl_table *ipv6_table;
  82         struct ctl_table *ipv6_route_table;
  83         struct ctl_table *ipv6_icmp_table;
  84         int err;
  85
  86         err = -ENOMEM;
  87         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  88                              GFP_KERNEL);
  89         if (!ipv6_table)
  90                 goto out;
  91         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
  92         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
  93         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
  94         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
  95         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
  96
  97         ipv6_route_table = ipv6_route_sysctl_init(net);
  98         if (!ipv6_route_table)
  99                 goto out_ipv6_table;
 100
 101         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 102         if (!ipv6_icmp_table)
 103                 goto out_ipv6_route_table;
 104
 105         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 106         if (!net->ipv6.sysctl.hdr)
 107                 goto out_ipv6_icmp_table;
 108
 109         net->ipv6.sysctl.route_hdr =
 110                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 111         if (!net->ipv6.sysctl.route_hdr)
 112                 goto out_unregister_ipv6_table;
 113
 114         net->ipv6.sysctl.icmp_hdr =
 115                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 116         if (!net->ipv6.sysctl.icmp_hdr)
 117                 goto out_unregister_route_table;
 118
 119         err = 0;
 120 out:
 121         return err;
 122 out_unregister_route_table:
 123         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 124 out_unregister_ipv6_table:
 125         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 126 out_ipv6_icmp_table:
 127         kfree(ipv6_icmp_table);
 128 out_ipv6_route_table:
 129         kfree(ipv6_route_table);
 130 out_ipv6_table:
 131         kfree(ipv6_table);
 132         goto out;
 133 }
 134
 135 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 136 {
 137         struct ctl_table *ipv6_table;
 138         struct ctl_table *ipv6_route_table;
 139         struct ctl_table *ipv6_icmp_table;
 140
 141         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 142         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 143         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 144
 145         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 146         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 147         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 148
 149         kfree(ipv6_table);
 150         kfree(ipv6_route_table);
 151         kfree(ipv6_icmp_table);
 152 }
 153
 154 static struct pernet_operations ipv6_sysctl_net_ops = {
 155         .init = ipv6_sysctl_net_init,
 156         .exit = ipv6_sysctl_net_exit,
 157 };
 158
 159 static struct ctl_table_header *ip6_header;
 160
 161 int ipv6_sysctl_register(void)
 162 {
 163         int err = -ENOMEM;
 164
 165         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 166         if (ip6_header == NULL)
 167                 goto out;
 168
 169         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 170         if (err)
 171                 goto err_pernet;
 172 out:
 173         return err;
 174
 175 err_pernet:
 176         unregister_net_sysctl_table(ip6_header);
 177         goto out;
 178 }
 179
 180 void ipv6_sysctl_unregister(void)
 181 {
 182         unregister_net_sysctl_table(ip6_header);
 183         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 184 }