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 .procname = "route", 20 .maxlen = 0, 21 .mode = 0555, 22 .child = ipv6_route_table_template 23 }, 24 { 25 .procname = "icmp", 26 .maxlen = 0, 27 .mode = 0555, 28 .child = ipv6_icmp_table_template 29 }, 30 { 31 .procname = "bindv6only", 32 .data = &init_net.ipv6.sysctl.bindv6only, 33 .maxlen = sizeof(int), 34 .mode = 0644, 35 .proc_handler = proc_dointvec 36 }, 37 { } 38 }; 39 40 static ctl_table ipv6_rotable[] = { 41 { 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 { } 49 }; 50 51 struct ctl_path net_ipv6_ctl_path[] = { 52 { .procname = "net", }, 53 { .procname = "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 net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path, 84 ipv6_table); 85 if (!net->ipv6.sysctl.table) 86 goto out_ipv6_icmp_table; 87 88 err = 0; 89 out: 90 return err; 91 92 out_ipv6_icmp_table: 93 kfree(ipv6_icmp_table); 94 out_ipv6_route_table: 95 kfree(ipv6_route_table); 96 out_ipv6_table: 97 kfree(ipv6_table); 98 goto out; 99 } 100 101 static void ipv6_sysctl_net_exit(struct net *net) 102 { 103 struct ctl_table *ipv6_table; 104 struct ctl_table *ipv6_route_table; 105 struct ctl_table *ipv6_icmp_table; 106 107 ipv6_table = net->ipv6.sysctl.table->ctl_table_arg; 108 ipv6_route_table = ipv6_table[0].child; 109 ipv6_icmp_table = ipv6_table[1].child; 110 111 unregister_net_sysctl_table(net->ipv6.sysctl.table); 112 113 kfree(ipv6_table); 114 kfree(ipv6_route_table); 115 kfree(ipv6_icmp_table); 116 } 117 118 static struct pernet_operations ipv6_sysctl_net_ops = { 119 .init = ipv6_sysctl_net_init, 120 .exit = ipv6_sysctl_net_exit, 121 }; 122 123 static struct ctl_table_header *ip6_header; 124 125 int ipv6_sysctl_register(void) 126 { 127 int err = -ENOMEM; 128 129 ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_rotable); 130 if (ip6_header == NULL) 131 goto out; 132 133 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 134 if (err) 135 goto err_pernet; 136 out: 137 return err; 138 139 err_pernet: 140 unregister_net_sysctl_table(ip6_header); 141 goto out; 142 } 143 144 void ipv6_sysctl_unregister(void) 145 { 146 unregister_net_sysctl_table(ip6_header); 147 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 148 } 149 150 static struct ctl_table_header *ip6_base; 151 152 int ipv6_static_sysctl_register(void) 153 { 154 static struct ctl_table empty[1]; 155 ip6_base = register_sysctl_paths(net_ipv6_ctl_path, empty); 156 if (ip6_base == NULL) 157 return -ENOMEM; 158 return 0; 159 } 160 161 void ipv6_static_sysctl_unregister(void) 162 { 163 unregister_net_sysctl_table(ip6_base); 164 } 165