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
  78         ipv6_route_table = ipv6_route_sysctl_init(net);
  79         if (!ipv6_route_table)
  80                 goto out_ipv6_table;
  81
  82         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  83         if (!ipv6_icmp_table)
  84                 goto out_ipv6_route_table;
  85
  86         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
  87         if (!net->ipv6.sysctl.hdr)
  88                 goto out_ipv6_icmp_table;
  89
  90         net->ipv6.sysctl.route_hdr =
  91                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
  92         if (!net->ipv6.sysctl.route_hdr)
  93                 goto out_unregister_ipv6_table;
  94
  95         net->ipv6.sysctl.icmp_hdr =
  96                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
  97         if (!net->ipv6.sysctl.icmp_hdr)
  98                 goto out_unregister_route_table;
  99
 100         err = 0;
 101 out:
 102         return err;
 103 out_unregister_route_table:
 104         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 105 out_unregister_ipv6_table:
 106         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 107 out_ipv6_icmp_table:
 108         kfree(ipv6_icmp_table);
 109 out_ipv6_route_table:
 110         kfree(ipv6_route_table);
 111 out_ipv6_table:
 112         kfree(ipv6_table);
 113         goto out;
 114 }
 115
 116 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 117 {
 118         struct ctl_table *ipv6_table;
 119         struct ctl_table *ipv6_route_table;
 120         struct ctl_table *ipv6_icmp_table;
 121
 122         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 123         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 124         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 125
 126         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 127         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 128         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 129
 130         kfree(ipv6_table);
 131         kfree(ipv6_route_table);
 132         kfree(ipv6_icmp_table);
 133 }
 134
 135 static struct pernet_operations ipv6_sysctl_net_ops = {
 136         .init = ipv6_sysctl_net_init,
 137         .exit = ipv6_sysctl_net_exit,
 138 };
 139
 140 static struct ctl_table_header *ip6_header;
 141
 142 int ipv6_sysctl_register(void)
 143 {
 144         int err = -ENOMEM;
 145
 146         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 147         if (ip6_header == NULL)
 148                 goto out;
 149
 150         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 151         if (err)
 152                 goto err_pernet;
 153 out:
 154         return err;
 155
 156 err_pernet:
 157         unregister_net_sysctl_table(ip6_header);
 158         goto out;
 159 }
 160
 161 void ipv6_sysctl_unregister(void)
 162 {
 163         unregister_net_sysctl_table(ip6_header);
 164         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 165 }