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 75 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 76 if (!ipv6_icmp_table) 77 goto out_ipv6_route_table; 78 79 ipv6_route_table[0].data = &net->ipv6.sysctl.flush_delay; 80 /* ipv6_route_table[1].data will be handled when we have 81 routes per namespace */ 82 ipv6_route_table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; 83 ipv6_route_table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; 84 ipv6_route_table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; 85 ipv6_route_table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; 86 ipv6_route_table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; 87 ipv6_route_table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; 88 ipv6_route_table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; 89 ipv6_table[0].child = ipv6_route_table; 90 91 ipv6_icmp_table[0].data = &net->ipv6.sysctl.icmpv6_time; 92 ipv6_table[1].child = ipv6_icmp_table; 93 94 ipv6_table[2].data = &net->ipv6.sysctl.bindv6only; 95 96 /* We don't want this value to be per namespace, it should be global 97 to all namespaces, so make it read-only when we are not in the 98 init network namespace */ 99 if (net != &init_net) 100 ipv6_table[3].mode = 0444; 101 102 net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path, 103 ipv6_table); 104 if (!net->ipv6.sysctl.table) 105 goto out_ipv6_icmp_table; 106 107 err = 0; 108 out: 109 return err; 110 111 out_ipv6_icmp_table: 112 kfree(ipv6_icmp_table); 113 out_ipv6_route_table: 114 kfree(ipv6_route_table); 115 out_ipv6_table: 116 kfree(ipv6_table); 117 goto out; 118 } 119 120 static void ipv6_sysctl_net_exit(struct net *net) 121 { 122 struct ctl_table *ipv6_table; 123 struct ctl_table *ipv6_route_table; 124 struct ctl_table *ipv6_icmp_table; 125 126 ipv6_table = net->ipv6.sysctl.table->ctl_table_arg; 127 ipv6_route_table = ipv6_table[0].child; 128 ipv6_icmp_table = ipv6_table[1].child; 129 130 unregister_net_sysctl_table(net->ipv6.sysctl.table); 131 132 kfree(ipv6_table); 133 kfree(ipv6_route_table); 134 kfree(ipv6_icmp_table); 135 } 136 137 static struct pernet_operations ipv6_sysctl_net_ops = { 138 .init = ipv6_sysctl_net_init, 139 .exit = ipv6_sysctl_net_exit, 140 }; 141 142 int ipv6_sysctl_register(void) 143 { 144 return register_pernet_subsys(&ipv6_sysctl_net_ops); 145 } 146 147 void ipv6_sysctl_unregister(void) 148 { 149 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 150 } 151