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 .procname = "fwmark_reflect", 43 .data = &init_net.ipv6.sysctl.fwmark_reflect, 44 .maxlen = sizeof(int), 45 .mode = 0644, 46 .proc_handler = proc_dointvec 47 }, 48 { } 49 }; 50 51 static struct ctl_table ipv6_rotable[] = { 52 { 53 .procname = "mld_max_msf", 54 .data = &sysctl_mld_max_msf, 55 .maxlen = sizeof(int), 56 .mode = 0644, 57 .proc_handler = proc_dointvec 58 }, 59 { } 60 }; 61 62 static int __net_init 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 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; 75 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply; 76 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency; 77 78 ipv6_route_table = ipv6_route_sysctl_init(net); 79 if (!ipv6_route_table) 80 goto out_ipv6_table; 81 82 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 83 if (!ipv6_icmp_table) 84 goto out_ipv6_route_table; 85 86 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 87 if (!net->ipv6.sysctl.hdr) 88 goto out_ipv6_icmp_table; 89 90 net->ipv6.sysctl.route_hdr = 91 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 92 if (!net->ipv6.sysctl.route_hdr) 93 goto out_unregister_ipv6_table; 94 95 net->ipv6.sysctl.icmp_hdr = 96 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 97 if (!net->ipv6.sysctl.icmp_hdr) 98 goto out_unregister_route_table; 99 100 err = 0; 101 out: 102 return err; 103 out_unregister_route_table: 104 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 105 out_unregister_ipv6_table: 106 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 107 out_ipv6_icmp_table: 108 kfree(ipv6_icmp_table); 109 out_ipv6_route_table: 110 kfree(ipv6_route_table); 111 out_ipv6_table: 112 kfree(ipv6_table); 113 goto out; 114 } 115 116 static void __net_exit ipv6_sysctl_net_exit(struct net *net) 117 { 118 struct ctl_table *ipv6_table; 119 struct ctl_table *ipv6_route_table; 120 struct ctl_table *ipv6_icmp_table; 121 122 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; 123 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 124 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 125 126 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 127 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 128 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 129 130 kfree(ipv6_table); 131 kfree(ipv6_route_table); 132 kfree(ipv6_icmp_table); 133 } 134 135 static struct pernet_operations ipv6_sysctl_net_ops = { 136 .init = ipv6_sysctl_net_init, 137 .exit = ipv6_sysctl_net_exit, 138 }; 139 140 static struct ctl_table_header *ip6_header; 141 142 int ipv6_sysctl_register(void) 143 { 144 int err = -ENOMEM; 145 146 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 147 if (ip6_header == NULL) 148 goto out; 149 150 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 151 if (err) 152 goto err_pernet; 153 out: 154 return err; 155 156 err_pernet: 157 unregister_net_sysctl_table(ip6_header); 158 goto out; 159 } 160 161 void ipv6_sysctl_unregister(void) 162 { 163 unregister_net_sysctl_table(ip6_header); 164 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 165 } 166