1 // SPDX-License-Identifier: GPL-2.0
3 * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
6 * YOSHIFUJI Hideaki @USAGI: added icmp sysctl table.
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>
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>
24 static int flowlabel_reflect_max = 0x7;
25 static int auto_flowlabels_min;
26 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
28 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
29 void __user *buffer, size_t *lenp,
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);
44 static struct ctl_table ipv6_table_template[] = {
46 .procname = "bindv6only",
47 .data = &init_net.ipv6.sysctl.bindv6only,
48 .maxlen = sizeof(int),
50 .proc_handler = proc_dointvec
53 .procname = "anycast_src_echo_reply",
54 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
55 .maxlen = sizeof(int),
57 .proc_handler = proc_dointvec
60 .procname = "flowlabel_consistency",
61 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
62 .maxlen = sizeof(int),
64 .proc_handler = proc_dointvec
67 .procname = "auto_flowlabels",
68 .data = &init_net.ipv6.sysctl.auto_flowlabels,
69 .maxlen = sizeof(int),
71 .proc_handler = proc_dointvec_minmax,
72 .extra1 = &auto_flowlabels_min,
73 .extra2 = &auto_flowlabels_max
76 .procname = "fwmark_reflect",
77 .data = &init_net.ipv6.sysctl.fwmark_reflect,
78 .maxlen = sizeof(int),
80 .proc_handler = proc_dointvec
83 .procname = "idgen_retries",
84 .data = &init_net.ipv6.sysctl.idgen_retries,
85 .maxlen = sizeof(int),
87 .proc_handler = proc_dointvec,
90 .procname = "idgen_delay",
91 .data = &init_net.ipv6.sysctl.idgen_delay,
92 .maxlen = sizeof(int),
94 .proc_handler = proc_dointvec_jiffies,
97 .procname = "flowlabel_state_ranges",
98 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
99 .maxlen = sizeof(int),
101 .proc_handler = proc_dointvec
104 .procname = "ip_nonlocal_bind",
105 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
106 .maxlen = sizeof(int),
108 .proc_handler = proc_dointvec
111 .procname = "flowlabel_reflect",
112 .data = &init_net.ipv6.sysctl.flowlabel_reflect,
113 .maxlen = sizeof(int),
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = SYSCTL_ZERO,
117 .extra2 = &flowlabel_reflect_max,
120 .procname = "max_dst_opts_number",
121 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
122 .maxlen = sizeof(int),
124 .proc_handler = proc_dointvec
127 .procname = "max_hbh_opts_number",
128 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
129 .maxlen = sizeof(int),
131 .proc_handler = proc_dointvec
134 .procname = "max_dst_opts_length",
135 .data = &init_net.ipv6.sysctl.max_dst_opts_len,
136 .maxlen = sizeof(int),
138 .proc_handler = proc_dointvec
141 .procname = "max_hbh_length",
142 .data = &init_net.ipv6.sysctl.max_hbh_opts_len,
143 .maxlen = sizeof(int),
145 .proc_handler = proc_dointvec
148 .procname = "fib_multipath_hash_policy",
149 .data = &init_net.ipv6.sysctl.multipath_hash_policy,
150 .maxlen = sizeof(int),
152 .proc_handler = proc_rt6_multipath_hash_policy,
153 .extra1 = SYSCTL_ZERO,
154 .extra2 = SYSCTL_ONE,
157 .procname = "seg6_flowlabel",
158 .data = &init_net.ipv6.sysctl.seg6_flowlabel,
159 .maxlen = sizeof(int),
161 .proc_handler = proc_dointvec
166 static struct ctl_table ipv6_rotable[] = {
168 .procname = "mld_max_msf",
169 .data = &sysctl_mld_max_msf,
170 .maxlen = sizeof(int),
172 .proc_handler = proc_dointvec
175 .procname = "mld_qrv",
176 .data = &sysctl_mld_qrv,
177 .maxlen = sizeof(int),
179 .proc_handler = proc_dointvec_minmax,
182 #ifdef CONFIG_NETLABEL
184 .procname = "calipso_cache_enable",
185 .data = &calipso_cache_enabled,
186 .maxlen = sizeof(int),
188 .proc_handler = proc_dointvec,
191 .procname = "calipso_cache_bucket_size",
192 .data = &calipso_cache_bucketsize,
193 .maxlen = sizeof(int),
195 .proc_handler = proc_dointvec,
197 #endif /* CONFIG_NETLABEL */
201 static int __net_init ipv6_sysctl_net_init(struct net *net)
203 struct ctl_table *ipv6_table;
204 struct ctl_table *ipv6_route_table;
205 struct ctl_table *ipv6_icmp_table;
209 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
213 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
214 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
215 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
216 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
217 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
218 ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
219 ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
220 ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
221 ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
222 ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
223 ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
224 ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
225 ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
226 ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
227 ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
228 ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
230 ipv6_route_table = ipv6_route_sysctl_init(net);
231 if (!ipv6_route_table)
234 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
235 if (!ipv6_icmp_table)
236 goto out_ipv6_route_table;
238 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
239 if (!net->ipv6.sysctl.hdr)
240 goto out_ipv6_icmp_table;
242 net->ipv6.sysctl.route_hdr =
243 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
244 if (!net->ipv6.sysctl.route_hdr)
245 goto out_unregister_ipv6_table;
247 net->ipv6.sysctl.icmp_hdr =
248 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
249 if (!net->ipv6.sysctl.icmp_hdr)
250 goto out_unregister_route_table;
255 out_unregister_route_table:
256 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
257 out_unregister_ipv6_table:
258 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
260 kfree(ipv6_icmp_table);
261 out_ipv6_route_table:
262 kfree(ipv6_route_table);
268 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
270 struct ctl_table *ipv6_table;
271 struct ctl_table *ipv6_route_table;
272 struct ctl_table *ipv6_icmp_table;
274 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
275 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
276 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
278 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
279 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
280 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
283 kfree(ipv6_route_table);
284 kfree(ipv6_icmp_table);
287 static struct pernet_operations ipv6_sysctl_net_ops = {
288 .init = ipv6_sysctl_net_init,
289 .exit = ipv6_sysctl_net_exit,
292 static struct ctl_table_header *ip6_header;
294 int ipv6_sysctl_register(void)
298 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
302 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
309 unregister_net_sysctl_table(ip6_header);
313 void ipv6_sysctl_unregister(void)
315 unregister_net_sysctl_table(ip6_header);
316 unregister_pernet_subsys(&ipv6_sysctl_net_ops);