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 { .ctl_name = 0 } 41 }; 42 43 static ctl_table ipv6_table[] = { 44 { 45 .ctl_name = NET_IPV6_MLD_MAX_MSF, 46 .procname = "mld_max_msf", 47 .data = &sysctl_mld_max_msf, 48 .maxlen = sizeof(int), 49 .mode = 0644, 50 .proc_handler = &proc_dointvec 51 }, 52 { .ctl_name = 0 } 53 }; 54 55 struct ctl_path net_ipv6_ctl_path[] = { 56 { .procname = "net", .ctl_name = CTL_NET, }, 57 { .procname = "ipv6", .ctl_name = NET_IPV6, }, 58 { }, 59 }; 60 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path); 61 62 static int 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 75 ipv6_route_table = ipv6_route_sysctl_init(net); 76 if (!ipv6_route_table) 77 goto out_ipv6_table; 78 ipv6_table[0].child = ipv6_route_table; 79 80 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 81 if (!ipv6_icmp_table) 82 goto out_ipv6_route_table; 83 ipv6_table[1].child = ipv6_icmp_table; 84 85 ipv6_table[2].data = &net->ipv6.sysctl.bindv6only; 86 87 net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path, 88 ipv6_table); 89 if (!net->ipv6.sysctl.table) 90 goto out_ipv6_icmp_table; 91 92 err = 0; 93 out: 94 return err; 95 96 out_ipv6_icmp_table: 97 kfree(ipv6_icmp_table); 98 out_ipv6_route_table: 99 kfree(ipv6_route_table); 100 out_ipv6_table: 101 kfree(ipv6_table); 102 goto out; 103 } 104 105 static void ipv6_sysctl_net_exit(struct net *net) 106 { 107 struct ctl_table *ipv6_table; 108 struct ctl_table *ipv6_route_table; 109 struct ctl_table *ipv6_icmp_table; 110 111 ipv6_table = net->ipv6.sysctl.table->ctl_table_arg; 112 ipv6_route_table = ipv6_table[0].child; 113 ipv6_icmp_table = ipv6_table[1].child; 114 115 unregister_net_sysctl_table(net->ipv6.sysctl.table); 116 117 kfree(ipv6_table); 118 kfree(ipv6_route_table); 119 kfree(ipv6_icmp_table); 120 } 121 122 static struct pernet_operations ipv6_sysctl_net_ops = { 123 .init = ipv6_sysctl_net_init, 124 .exit = ipv6_sysctl_net_exit, 125 }; 126 127 static struct ctl_table_header *ip6_header; 128 129 int ipv6_sysctl_register(void) 130 { 131 int err = -ENOMEM;; 132 133 ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_table); 134 if (ip6_header == NULL) 135 goto out; 136 137 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 138 if (err) 139 goto err_pernet; 140 out: 141 return err; 142 143 err_pernet: 144 unregister_net_sysctl_table(ip6_header); 145 goto out; 146 } 147 148 void ipv6_sysctl_unregister(void) 149 { 150 unregister_net_sysctl_table(ip6_header); 151 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 152 } 153 154 static struct ctl_table_header *ip6_base; 155 156 int ipv6_static_sysctl_register(void) 157 { 158 static struct ctl_table empty[1]; 159 ip6_base = register_net_sysctl_rotable(net_ipv6_ctl_path, empty); 160 if (ip6_base == NULL) 161 return -ENOMEM; 162 return 0; 163 } 164 165 void ipv6_static_sysctl_unregister(void) 166 { 167 unregister_net_sysctl_table(ip6_base); 168 } 169