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 int one = 1; 20 21 static struct ctl_table ipv6_table_template[] = { 22 { 23 .procname = "bindv6only", 24 .data = &init_net.ipv6.sysctl.bindv6only, 25 .maxlen = sizeof(int), 26 .mode = 0644, 27 .proc_handler = proc_dointvec 28 }, 29 { 30 .procname = "anycast_src_echo_reply", 31 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply, 32 .maxlen = sizeof(int), 33 .mode = 0644, 34 .proc_handler = proc_dointvec 35 }, 36 { 37 .procname = "flowlabel_consistency", 38 .data = &init_net.ipv6.sysctl.flowlabel_consistency, 39 .maxlen = sizeof(int), 40 .mode = 0644, 41 .proc_handler = proc_dointvec 42 }, 43 { 44 .procname = "auto_flowlabels", 45 .data = &init_net.ipv6.sysctl.auto_flowlabels, 46 .maxlen = sizeof(int), 47 .mode = 0644, 48 .proc_handler = proc_dointvec 49 }, 50 { 51 .procname = "fwmark_reflect", 52 .data = &init_net.ipv6.sysctl.fwmark_reflect, 53 .maxlen = sizeof(int), 54 .mode = 0644, 55 .proc_handler = proc_dointvec 56 }, 57 { } 58 }; 59 60 static struct ctl_table ipv6_rotable[] = { 61 { 62 .procname = "mld_max_msf", 63 .data = &sysctl_mld_max_msf, 64 .maxlen = sizeof(int), 65 .mode = 0644, 66 .proc_handler = proc_dointvec 67 }, 68 { 69 .procname = "mld_qrv", 70 .data = &sysctl_mld_qrv, 71 .maxlen = sizeof(int), 72 .mode = 0644, 73 .proc_handler = proc_dointvec_minmax, 74 .extra1 = &one 75 }, 76 { } 77 }; 78 79 static int __net_init ipv6_sysctl_net_init(struct net *net) 80 { 81 struct ctl_table *ipv6_table; 82 struct ctl_table *ipv6_route_table; 83 struct ctl_table *ipv6_icmp_table; 84 int err; 85 86 err = -ENOMEM; 87 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 88 GFP_KERNEL); 89 if (!ipv6_table) 90 goto out; 91 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; 92 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply; 93 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency; 94 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels; 95 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect; 96 97 ipv6_route_table = ipv6_route_sysctl_init(net); 98 if (!ipv6_route_table) 99 goto out_ipv6_table; 100 101 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 102 if (!ipv6_icmp_table) 103 goto out_ipv6_route_table; 104 105 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 106 if (!net->ipv6.sysctl.hdr) 107 goto out_ipv6_icmp_table; 108 109 net->ipv6.sysctl.route_hdr = 110 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 111 if (!net->ipv6.sysctl.route_hdr) 112 goto out_unregister_ipv6_table; 113 114 net->ipv6.sysctl.icmp_hdr = 115 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 116 if (!net->ipv6.sysctl.icmp_hdr) 117 goto out_unregister_route_table; 118 119 err = 0; 120 out: 121 return err; 122 out_unregister_route_table: 123 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 124 out_unregister_ipv6_table: 125 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 126 out_ipv6_icmp_table: 127 kfree(ipv6_icmp_table); 128 out_ipv6_route_table: 129 kfree(ipv6_route_table); 130 out_ipv6_table: 131 kfree(ipv6_table); 132 goto out; 133 } 134 135 static void __net_exit ipv6_sysctl_net_exit(struct net *net) 136 { 137 struct ctl_table *ipv6_table; 138 struct ctl_table *ipv6_route_table; 139 struct ctl_table *ipv6_icmp_table; 140 141 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; 142 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 143 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 144 145 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 146 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 147 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 148 149 kfree(ipv6_table); 150 kfree(ipv6_route_table); 151 kfree(ipv6_icmp_table); 152 } 153 154 static struct pernet_operations ipv6_sysctl_net_ops = { 155 .init = ipv6_sysctl_net_init, 156 .exit = ipv6_sysctl_net_exit, 157 }; 158 159 static struct ctl_table_header *ip6_header; 160 161 int ipv6_sysctl_register(void) 162 { 163 int err = -ENOMEM; 164 165 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 166 if (ip6_header == NULL) 167 goto out; 168 169 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 170 if (err) 171 goto err_pernet; 172 out: 173 return err; 174 175 err_pernet: 176 unregister_net_sysctl_table(ip6_header); 177 goto out; 178 } 179 180 void ipv6_sysctl_unregister(void) 181 { 182 unregister_net_sysctl_table(ip6_header); 183 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 184 } 185