1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem. 4 * 5 * Changes: 6 * YOSHIFUJI Hideaki @USAGI: added icmp sysctl table. 7 */ 8 9 #include <linux/mm.h> 10 #include <linux/sysctl.h> 11 #include <linux/in6.h> 12 #include <linux/ipv6.h> 13 #include <linux/slab.h> 14 #include <linux/export.h> 15 #include <net/ndisc.h> 16 #include <net/ipv6.h> 17 #include <net/addrconf.h> 18 #include <net/inet_frag.h> 19 #include <net/netevent.h> 20 #ifdef CONFIG_NETLABEL 21 #include <net/calipso.h> 22 #endif 23 24 static int two = 2; 25 static int flowlabel_reflect_max = 0x7; 26 static int auto_flowlabels_min; 27 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX; 28 29 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write, 30 void *buffer, size_t *lenp, loff_t *ppos) 31 { 32 struct net *net; 33 int ret; 34 35 net = container_of(table->data, struct net, 36 ipv6.sysctl.multipath_hash_policy); 37 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 38 if (write && ret == 0) 39 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net); 40 41 return ret; 42 } 43 44 static struct ctl_table ipv6_table_template[] = { 45 { 46 .procname = "bindv6only", 47 .data = &init_net.ipv6.sysctl.bindv6only, 48 .maxlen = sizeof(int), 49 .mode = 0644, 50 .proc_handler = proc_dointvec 51 }, 52 { 53 .procname = "anycast_src_echo_reply", 54 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply, 55 .maxlen = sizeof(int), 56 .mode = 0644, 57 .proc_handler = proc_dointvec 58 }, 59 { 60 .procname = "flowlabel_consistency", 61 .data = &init_net.ipv6.sysctl.flowlabel_consistency, 62 .maxlen = sizeof(int), 63 .mode = 0644, 64 .proc_handler = proc_dointvec 65 }, 66 { 67 .procname = "auto_flowlabels", 68 .data = &init_net.ipv6.sysctl.auto_flowlabels, 69 .maxlen = sizeof(int), 70 .mode = 0644, 71 .proc_handler = proc_dointvec_minmax, 72 .extra1 = &auto_flowlabels_min, 73 .extra2 = &auto_flowlabels_max 74 }, 75 { 76 .procname = "fwmark_reflect", 77 .data = &init_net.ipv6.sysctl.fwmark_reflect, 78 .maxlen = sizeof(int), 79 .mode = 0644, 80 .proc_handler = proc_dointvec 81 }, 82 { 83 .procname = "idgen_retries", 84 .data = &init_net.ipv6.sysctl.idgen_retries, 85 .maxlen = sizeof(int), 86 .mode = 0644, 87 .proc_handler = proc_dointvec, 88 }, 89 { 90 .procname = "idgen_delay", 91 .data = &init_net.ipv6.sysctl.idgen_delay, 92 .maxlen = sizeof(int), 93 .mode = 0644, 94 .proc_handler = proc_dointvec_jiffies, 95 }, 96 { 97 .procname = "flowlabel_state_ranges", 98 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges, 99 .maxlen = sizeof(int), 100 .mode = 0644, 101 .proc_handler = proc_dointvec 102 }, 103 { 104 .procname = "ip_nonlocal_bind", 105 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind, 106 .maxlen = sizeof(int), 107 .mode = 0644, 108 .proc_handler = proc_dointvec 109 }, 110 { 111 .procname = "flowlabel_reflect", 112 .data = &init_net.ipv6.sysctl.flowlabel_reflect, 113 .maxlen = sizeof(int), 114 .mode = 0644, 115 .proc_handler = proc_dointvec_minmax, 116 .extra1 = SYSCTL_ZERO, 117 .extra2 = &flowlabel_reflect_max, 118 }, 119 { 120 .procname = "max_dst_opts_number", 121 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt, 122 .maxlen = sizeof(int), 123 .mode = 0644, 124 .proc_handler = proc_dointvec 125 }, 126 { 127 .procname = "max_hbh_opts_number", 128 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt, 129 .maxlen = sizeof(int), 130 .mode = 0644, 131 .proc_handler = proc_dointvec 132 }, 133 { 134 .procname = "max_dst_opts_length", 135 .data = &init_net.ipv6.sysctl.max_dst_opts_len, 136 .maxlen = sizeof(int), 137 .mode = 0644, 138 .proc_handler = proc_dointvec 139 }, 140 { 141 .procname = "max_hbh_length", 142 .data = &init_net.ipv6.sysctl.max_hbh_opts_len, 143 .maxlen = sizeof(int), 144 .mode = 0644, 145 .proc_handler = proc_dointvec 146 }, 147 { 148 .procname = "fib_multipath_hash_policy", 149 .data = &init_net.ipv6.sysctl.multipath_hash_policy, 150 .maxlen = sizeof(int), 151 .mode = 0644, 152 .proc_handler = proc_rt6_multipath_hash_policy, 153 .extra1 = SYSCTL_ZERO, 154 .extra2 = &two, 155 }, 156 { 157 .procname = "seg6_flowlabel", 158 .data = &init_net.ipv6.sysctl.seg6_flowlabel, 159 .maxlen = sizeof(int), 160 .mode = 0644, 161 .proc_handler = proc_dointvec 162 }, 163 { 164 .procname = "fib_notify_on_flag_change", 165 .data = &init_net.ipv6.sysctl.fib_notify_on_flag_change, 166 .maxlen = sizeof(int), 167 .mode = 0644, 168 .proc_handler = proc_dointvec_minmax, 169 .extra1 = SYSCTL_ZERO, 170 .extra2 = &two, 171 }, 172 { } 173 }; 174 175 static struct ctl_table ipv6_rotable[] = { 176 { 177 .procname = "mld_max_msf", 178 .data = &sysctl_mld_max_msf, 179 .maxlen = sizeof(int), 180 .mode = 0644, 181 .proc_handler = proc_dointvec 182 }, 183 { 184 .procname = "mld_qrv", 185 .data = &sysctl_mld_qrv, 186 .maxlen = sizeof(int), 187 .mode = 0644, 188 .proc_handler = proc_dointvec_minmax, 189 .extra1 = SYSCTL_ONE 190 }, 191 #ifdef CONFIG_NETLABEL 192 { 193 .procname = "calipso_cache_enable", 194 .data = &calipso_cache_enabled, 195 .maxlen = sizeof(int), 196 .mode = 0644, 197 .proc_handler = proc_dointvec, 198 }, 199 { 200 .procname = "calipso_cache_bucket_size", 201 .data = &calipso_cache_bucketsize, 202 .maxlen = sizeof(int), 203 .mode = 0644, 204 .proc_handler = proc_dointvec, 205 }, 206 #endif /* CONFIG_NETLABEL */ 207 { } 208 }; 209 210 static int __net_init ipv6_sysctl_net_init(struct net *net) 211 { 212 struct ctl_table *ipv6_table; 213 struct ctl_table *ipv6_route_table; 214 struct ctl_table *ipv6_icmp_table; 215 int err, i; 216 217 err = -ENOMEM; 218 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 219 GFP_KERNEL); 220 if (!ipv6_table) 221 goto out; 222 /* Update the variables to point into the current struct net */ 223 for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++) 224 ipv6_table[i].data += (void *)net - (void *)&init_net; 225 226 ipv6_route_table = ipv6_route_sysctl_init(net); 227 if (!ipv6_route_table) 228 goto out_ipv6_table; 229 230 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 231 if (!ipv6_icmp_table) 232 goto out_ipv6_route_table; 233 234 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 235 if (!net->ipv6.sysctl.hdr) 236 goto out_ipv6_icmp_table; 237 238 net->ipv6.sysctl.route_hdr = 239 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 240 if (!net->ipv6.sysctl.route_hdr) 241 goto out_unregister_ipv6_table; 242 243 net->ipv6.sysctl.icmp_hdr = 244 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 245 if (!net->ipv6.sysctl.icmp_hdr) 246 goto out_unregister_route_table; 247 248 err = 0; 249 out: 250 return err; 251 out_unregister_route_table: 252 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 253 out_unregister_ipv6_table: 254 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 255 out_ipv6_icmp_table: 256 kfree(ipv6_icmp_table); 257 out_ipv6_route_table: 258 kfree(ipv6_route_table); 259 out_ipv6_table: 260 kfree(ipv6_table); 261 goto out; 262 } 263 264 static void __net_exit ipv6_sysctl_net_exit(struct net *net) 265 { 266 struct ctl_table *ipv6_table; 267 struct ctl_table *ipv6_route_table; 268 struct ctl_table *ipv6_icmp_table; 269 270 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; 271 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 272 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 273 274 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 275 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 276 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 277 278 kfree(ipv6_table); 279 kfree(ipv6_route_table); 280 kfree(ipv6_icmp_table); 281 } 282 283 static struct pernet_operations ipv6_sysctl_net_ops = { 284 .init = ipv6_sysctl_net_init, 285 .exit = ipv6_sysctl_net_exit, 286 }; 287 288 static struct ctl_table_header *ip6_header; 289 290 int ipv6_sysctl_register(void) 291 { 292 int err = -ENOMEM; 293 294 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 295 if (!ip6_header) 296 goto out; 297 298 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 299 if (err) 300 goto err_pernet; 301 out: 302 return err; 303 304 err_pernet: 305 unregister_net_sysctl_table(ip6_header); 306 goto out; 307 } 308 309 void ipv6_sysctl_unregister(void) 310 { 311 unregister_net_sysctl_table(ip6_header); 312 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 313 } 314