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 <net/ndisc.h> 13 #include <net/ipv6.h> 14 #include <net/addrconf.h> 15 #include <net/inet_frag.h> 16 17 static ctl_table ipv6_table_template[] = { 18 { 19 .ctl_name = NET_IPV6_ROUTE, 20 .procname = "route", 21 .maxlen = 0, 22 .mode = 0555, 23 .child = ipv6_route_table_template 24 }, 25 { 26 .ctl_name = NET_IPV6_ICMP, 27 .procname = "icmp", 28 .maxlen = 0, 29 .mode = 0555, 30 .child = ipv6_icmp_table_template 31 }, 32 { 33 .ctl_name = NET_IPV6_BINDV6ONLY, 34 .procname = "bindv6only", 35 .data = &init_net.ipv6.sysctl.bindv6only, 36 .maxlen = sizeof(int), 37 .mode = 0644, 38 .proc_handler = &proc_dointvec 39 }, 40 { 41 .ctl_name = NET_IPV6_MLD_MAX_MSF, 42 .procname = "mld_max_msf", 43 .data = &sysctl_mld_max_msf, 44 .maxlen = sizeof(int), 45 .mode = 0644, 46 .proc_handler = &proc_dointvec 47 }, 48 { .ctl_name = 0 } 49 }; 50 51 struct ctl_path net_ipv6_ctl_path[] = { 52 { .procname = "net", .ctl_name = CTL_NET, }, 53 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 54 { }, 55 }; 56 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path); 57 58 static int ipv6_sysctl_net_init(struct net *net) 59 { 60 struct ctl_table *ipv6_table; 61 struct ctl_table *ipv6_route_table; 62 struct ctl_table *ipv6_icmp_table; 63 int err; 64 65 err = -ENOMEM; 66 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 67 GFP_KERNEL); 68 if (!ipv6_table) 69 goto out; 70 71 ipv6_route_table = ipv6_route_sysctl_init(net); 72 if (!ipv6_route_table) 73 goto out_ipv6_table; 74 ipv6_table[0].child = ipv6_route_table; 75 76 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 77 if (!ipv6_icmp_table) 78 goto out_ipv6_route_table; 79 ipv6_table[1].child = ipv6_icmp_table; 80 81 ipv6_table[2].data = &net->ipv6.sysctl.bindv6only; 82 83 /* We don't want this value to be per namespace, it should be global 84 to all namespaces, so make it read-only when we are not in the 85 init network namespace */ 86 if (net != &init_net) 87 ipv6_table[3].mode = 0444; 88 89 net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path, 90 ipv6_table); 91 if (!net->ipv6.sysctl.table) 92 goto out_ipv6_icmp_table; 93 94 err = 0; 95 out: 96 return err; 97 98 out_ipv6_icmp_table: 99 kfree(ipv6_icmp_table); 100 out_ipv6_route_table: 101 kfree(ipv6_route_table); 102 out_ipv6_table: 103 kfree(ipv6_table); 104 goto out; 105 } 106 107 static void ipv6_sysctl_net_exit(struct net *net) 108 { 109 struct ctl_table *ipv6_table; 110 struct ctl_table *ipv6_route_table; 111 struct ctl_table *ipv6_icmp_table; 112 113 ipv6_table = net->ipv6.sysctl.table->ctl_table_arg; 114 ipv6_route_table = ipv6_table[0].child; 115 ipv6_icmp_table = ipv6_table[1].child; 116 117 unregister_net_sysctl_table(net->ipv6.sysctl.table); 118 119 kfree(ipv6_table); 120 kfree(ipv6_route_table); 121 kfree(ipv6_icmp_table); 122 } 123 124 static struct pernet_operations ipv6_sysctl_net_ops = { 125 .init = ipv6_sysctl_net_init, 126 .exit = ipv6_sysctl_net_exit, 127 }; 128 129 int ipv6_sysctl_register(void) 130 { 131 return register_pernet_subsys(&ipv6_sysctl_net_ops); 132 } 133 134 void ipv6_sysctl_unregister(void) 135 { 136 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 137 } 138