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 }; 43 44 static struct ctl_table ipv6_rotable[] = { 45 { 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 { } 53 }; 54 55 static int __net_init ipv6_sysctl_net_init(struct net *net) 56 { 57 struct ctl_table *ipv6_table; 58 struct ctl_table *ipv6_route_table; 59 struct ctl_table *ipv6_icmp_table; 60 int err; 61 62 err = -ENOMEM; 63 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 64 GFP_KERNEL); 65 if (!ipv6_table) 66 goto out; 67 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; 68 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply; 69 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency; 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 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 80 if (!net->ipv6.sysctl.hdr) 81 goto out_ipv6_icmp_table; 82 83 net->ipv6.sysctl.route_hdr = 84 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 85 if (!net->ipv6.sysctl.route_hdr) 86 goto out_unregister_ipv6_table; 87 88 net->ipv6.sysctl.icmp_hdr = 89 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 90 if (!net->ipv6.sysctl.icmp_hdr) 91 goto out_unregister_route_table; 92 93 err = 0; 94 out: 95 return err; 96 out_unregister_route_table: 97 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 98 out_unregister_ipv6_table: 99 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 100 out_ipv6_icmp_table: 101 kfree(ipv6_icmp_table); 102 out_ipv6_route_table: 103 kfree(ipv6_route_table); 104 out_ipv6_table: 105 kfree(ipv6_table); 106 goto out; 107 } 108 109 static void __net_exit ipv6_sysctl_net_exit(struct net *net) 110 { 111 struct ctl_table *ipv6_table; 112 struct ctl_table *ipv6_route_table; 113 struct ctl_table *ipv6_icmp_table; 114 115 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; 116 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 117 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 118 119 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 120 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 121 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 122 123 kfree(ipv6_table); 124 kfree(ipv6_route_table); 125 kfree(ipv6_icmp_table); 126 } 127 128 static struct pernet_operations ipv6_sysctl_net_ops = { 129 .init = ipv6_sysctl_net_init, 130 .exit = ipv6_sysctl_net_exit, 131 }; 132 133 static struct ctl_table_header *ip6_header; 134 135 int ipv6_sysctl_register(void) 136 { 137 int err = -ENOMEM; 138 139 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 140 if (ip6_header == NULL) 141 goto out; 142 143 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 144 if (err) 145 goto err_pernet; 146 out: 147 return err; 148 149 err_pernet: 150 unregister_net_sysctl_table(ip6_header); 151 goto out; 152 } 153 154 void ipv6_sysctl_unregister(void) 155 { 156 unregister_net_sysctl_table(ip6_header); 157 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 158 } 159