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 }; 36 37 static struct ctl_table ipv6_rotable[] = { 38 { 39 .procname = "mld_max_msf", 40 .data = &sysctl_mld_max_msf, 41 .maxlen = sizeof(int), 42 .mode = 0644, 43 .proc_handler = proc_dointvec 44 }, 45 { } 46 }; 47 48 static int __net_init ipv6_sysctl_net_init(struct net *net) 49 { 50 struct ctl_table *ipv6_table; 51 struct ctl_table *ipv6_route_table; 52 struct ctl_table *ipv6_icmp_table; 53 int err; 54 55 err = -ENOMEM; 56 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 57 GFP_KERNEL); 58 if (!ipv6_table) 59 goto out; 60 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; 61 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply; 62 63 ipv6_route_table = ipv6_route_sysctl_init(net); 64 if (!ipv6_route_table) 65 goto out_ipv6_table; 66 67 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 68 if (!ipv6_icmp_table) 69 goto out_ipv6_route_table; 70 71 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 72 if (!net->ipv6.sysctl.hdr) 73 goto out_ipv6_icmp_table; 74 75 net->ipv6.sysctl.route_hdr = 76 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 77 if (!net->ipv6.sysctl.route_hdr) 78 goto out_unregister_ipv6_table; 79 80 net->ipv6.sysctl.icmp_hdr = 81 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 82 if (!net->ipv6.sysctl.icmp_hdr) 83 goto out_unregister_route_table; 84 85 err = 0; 86 out: 87 return err; 88 out_unregister_route_table: 89 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 90 out_unregister_ipv6_table: 91 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 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 __net_exit 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.hdr->ctl_table_arg; 108 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 109 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 110 111 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 112 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 113 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 114 115 kfree(ipv6_table); 116 kfree(ipv6_route_table); 117 kfree(ipv6_icmp_table); 118 } 119 120 static struct pernet_operations ipv6_sysctl_net_ops = { 121 .init = ipv6_sysctl_net_init, 122 .exit = ipv6_sysctl_net_exit, 123 }; 124 125 static struct ctl_table_header *ip6_header; 126 127 int ipv6_sysctl_register(void) 128 { 129 int err = -ENOMEM; 130 131 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 132 if (ip6_header == NULL) 133 goto out; 134 135 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 136 if (err) 137 goto err_pernet; 138 out: 139 return err; 140 141 err_pernet: 142 unregister_net_sysctl_table(ip6_header); 143 goto out; 144 } 145 146 void ipv6_sysctl_unregister(void) 147 { 148 unregister_net_sysctl_table(ip6_header); 149 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 150 } 151