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 .procname = "idgen_retries", 59 .data = &init_net.ipv6.sysctl.idgen_retries, 60 .maxlen = sizeof(int), 61 .mode = 0644, 62 .proc_handler = proc_dointvec, 63 }, 64 { 65 .procname = "idgen_delay", 66 .data = &init_net.ipv6.sysctl.idgen_delay, 67 .maxlen = sizeof(int), 68 .mode = 0644, 69 .proc_handler = proc_dointvec_jiffies, 70 }, 71 { } 72 }; 73 74 static struct ctl_table ipv6_rotable[] = { 75 { 76 .procname = "mld_max_msf", 77 .data = &sysctl_mld_max_msf, 78 .maxlen = sizeof(int), 79 .mode = 0644, 80 .proc_handler = proc_dointvec 81 }, 82 { 83 .procname = "mld_qrv", 84 .data = &sysctl_mld_qrv, 85 .maxlen = sizeof(int), 86 .mode = 0644, 87 .proc_handler = proc_dointvec_minmax, 88 .extra1 = &one 89 }, 90 { } 91 }; 92 93 static int __net_init ipv6_sysctl_net_init(struct net *net) 94 { 95 struct ctl_table *ipv6_table; 96 struct ctl_table *ipv6_route_table; 97 struct ctl_table *ipv6_icmp_table; 98 int err; 99 100 err = -ENOMEM; 101 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 102 GFP_KERNEL); 103 if (!ipv6_table) 104 goto out; 105 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; 106 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply; 107 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency; 108 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels; 109 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect; 110 ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries; 111 ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay; 112 113 ipv6_route_table = ipv6_route_sysctl_init(net); 114 if (!ipv6_route_table) 115 goto out_ipv6_table; 116 117 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 118 if (!ipv6_icmp_table) 119 goto out_ipv6_route_table; 120 121 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 122 if (!net->ipv6.sysctl.hdr) 123 goto out_ipv6_icmp_table; 124 125 net->ipv6.sysctl.route_hdr = 126 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 127 if (!net->ipv6.sysctl.route_hdr) 128 goto out_unregister_ipv6_table; 129 130 net->ipv6.sysctl.icmp_hdr = 131 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 132 if (!net->ipv6.sysctl.icmp_hdr) 133 goto out_unregister_route_table; 134 135 err = 0; 136 out: 137 return err; 138 out_unregister_route_table: 139 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 140 out_unregister_ipv6_table: 141 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 142 out_ipv6_icmp_table: 143 kfree(ipv6_icmp_table); 144 out_ipv6_route_table: 145 kfree(ipv6_route_table); 146 out_ipv6_table: 147 kfree(ipv6_table); 148 goto out; 149 } 150 151 static void __net_exit ipv6_sysctl_net_exit(struct net *net) 152 { 153 struct ctl_table *ipv6_table; 154 struct ctl_table *ipv6_route_table; 155 struct ctl_table *ipv6_icmp_table; 156 157 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; 158 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 159 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 160 161 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 162 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 163 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 164 165 kfree(ipv6_table); 166 kfree(ipv6_route_table); 167 kfree(ipv6_icmp_table); 168 } 169 170 static struct pernet_operations ipv6_sysctl_net_ops = { 171 .init = ipv6_sysctl_net_init, 172 .exit = ipv6_sysctl_net_exit, 173 }; 174 175 static struct ctl_table_header *ip6_header; 176 177 int ipv6_sysctl_register(void) 178 { 179 int err = -ENOMEM; 180 181 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 182 if (!ip6_header) 183 goto out; 184 185 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 186 if (err) 187 goto err_pernet; 188 out: 189 return err; 190 191 err_pernet: 192 unregister_net_sysctl_table(ip6_header); 193 goto out; 194 } 195 196 void ipv6_sysctl_unregister(void) 197 { 198 unregister_net_sysctl_table(ip6_header); 199 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 200 } 201