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 struct ctl_table ipv6_table_template[] = {
  20         {
  21                 .procname       = "bindv6only",
  22                 .data           = &init_net.ipv6.sysctl.bindv6only,
  23                 .maxlen         = sizeof(int),
  24                 .mode           = 0644,
  25                 .proc_handler   = proc_dointvec
  26         },
  27         {
  28                 .procname       = "anycast_src_echo_reply",
  29                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  30                 .maxlen         = sizeof(int),
  31                 .mode           = 0644,
  32                 .proc_handler   = proc_dointvec
  33         },
  34         {
  35                 .procname       = "flowlabel_consistency",
  36                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  37                 .maxlen         = sizeof(int),
  38                 .mode           = 0644,
  39                 .proc_handler   = proc_dointvec
  40         },
  41         {
  42                 .procname       = "fwmark_reflect",
  43                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  44                 .maxlen         = sizeof(int),
  45                 .mode           = 0644,
  46                 .proc_handler   = proc_dointvec
  47         },
  48         { }
  49 };
  50
  51 static struct ctl_table ipv6_rotable[] = {
  52         {
  53                 .procname       = "mld_max_msf",
  54                 .data           = &sysctl_mld_max_msf,
  55                 .maxlen         = sizeof(int),
  56                 .mode           = 0644,
  57                 .proc_handler   = proc_dointvec
  58         },
  59         { }
  60 };
  61
  62 static int __net_init ipv6_sysctl_net_init(struct net *net)
  63 {
  64         struct ctl_table *ipv6_table;
  65         struct ctl_table *ipv6_route_table;
  66         struct ctl_table *ipv6_icmp_table;
  67         int err;
  68
  69         err = -ENOMEM;
  70         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  71                              GFP_KERNEL);
  72         if (!ipv6_table)
  73                 goto out;
  74         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
  75         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
  76         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
  77         ipv6_table[3].data = &net->ipv6.sysctl.fwmark_reflect;
  78
  79         ipv6_route_table = ipv6_route_sysctl_init(net);
  80         if (!ipv6_route_table)
  81                 goto out_ipv6_table;
  82
  83         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  84         if (!ipv6_icmp_table)
  85                 goto out_ipv6_route_table;
  86
  87         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
  88         if (!net->ipv6.sysctl.hdr)
  89                 goto out_ipv6_icmp_table;
  90
  91         net->ipv6.sysctl.route_hdr =
  92                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
  93         if (!net->ipv6.sysctl.route_hdr)
  94                 goto out_unregister_ipv6_table;
  95
  96         net->ipv6.sysctl.icmp_hdr =
  97                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
  98         if (!net->ipv6.sysctl.icmp_hdr)
  99                 goto out_unregister_route_table;
 100
 101         err = 0;
 102 out:
 103         return err;
 104 out_unregister_route_table:
 105         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 106 out_unregister_ipv6_table:
 107         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 108 out_ipv6_icmp_table:
 109         kfree(ipv6_icmp_table);
 110 out_ipv6_route_table:
 111         kfree(ipv6_route_table);
 112 out_ipv6_table:
 113         kfree(ipv6_table);
 114         goto out;
 115 }
 116
 117 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 118 {
 119         struct ctl_table *ipv6_table;
 120         struct ctl_table *ipv6_route_table;
 121         struct ctl_table *ipv6_icmp_table;
 122
 123         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 124         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 125         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 126
 127         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 128         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 129         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 130
 131         kfree(ipv6_table);
 132         kfree(ipv6_route_table);
 133         kfree(ipv6_icmp_table);
 134 }
 135
 136 static struct pernet_operations ipv6_sysctl_net_ops = {
 137         .init = ipv6_sysctl_net_init,
 138         .exit = ipv6_sysctl_net_exit,
 139 };
 140
 141 static struct ctl_table_header *ip6_header;
 142
 143 int ipv6_sysctl_register(void)
 144 {
 145         int err = -ENOMEM;
 146
 147         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 148         if (ip6_header == NULL)
 149                 goto out;
 150
 151         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 152         if (err)
 153                 goto err_pernet;
 154 out:
 155         return err;
 156
 157 err_pernet:
 158         unregister_net_sysctl_table(ip6_header);
 159         goto out;
 160 }
 161
 162 void ipv6_sysctl_unregister(void)
 163 {
 164         unregister_net_sysctl_table(ip6_header);
 165         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 166 }