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>
25 static int flowlabel_reflect_max = 0x7;
26 static int auto_flowlabels_min;
27 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
29 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
30 void __user *buffer, size_t *lenp,
36 net = container_of(table->data, struct net,
37 ipv6.sysctl.multipath_hash_policy);
38 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
39 if (write && ret == 0)
40 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
45 static struct ctl_table ipv6_table_template[] = {
47 .procname = "bindv6only",
48 .data = &init_net.ipv6.sysctl.bindv6only,
49 .maxlen = sizeof(int),
51 .proc_handler = proc_dointvec
54 .procname = "anycast_src_echo_reply",
55 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
56 .maxlen = sizeof(int),
58 .proc_handler = proc_dointvec
61 .procname = "flowlabel_consistency",
62 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
63 .maxlen = sizeof(int),
65 .proc_handler = proc_dointvec
68 .procname = "auto_flowlabels",
69 .data = &init_net.ipv6.sysctl.auto_flowlabels,
70 .maxlen = sizeof(int),
72 .proc_handler = proc_dointvec_minmax,
73 .extra1 = &auto_flowlabels_min,
74 .extra2 = &auto_flowlabels_max
77 .procname = "fwmark_reflect",
78 .data = &init_net.ipv6.sysctl.fwmark_reflect,
79 .maxlen = sizeof(int),
81 .proc_handler = proc_dointvec
84 .procname = "idgen_retries",
85 .data = &init_net.ipv6.sysctl.idgen_retries,
86 .maxlen = sizeof(int),
88 .proc_handler = proc_dointvec,
91 .procname = "idgen_delay",
92 .data = &init_net.ipv6.sysctl.idgen_delay,
93 .maxlen = sizeof(int),
95 .proc_handler = proc_dointvec_jiffies,
98 .procname = "flowlabel_state_ranges",
99 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
100 .maxlen = sizeof(int),
102 .proc_handler = proc_dointvec
105 .procname = "ip_nonlocal_bind",
106 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
107 .maxlen = sizeof(int),
109 .proc_handler = proc_dointvec
112 .procname = "flowlabel_reflect",
113 .data = &init_net.ipv6.sysctl.flowlabel_reflect,
114 .maxlen = sizeof(int),
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = SYSCTL_ZERO,
118 .extra2 = &flowlabel_reflect_max,
121 .procname = "max_dst_opts_number",
122 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
123 .maxlen = sizeof(int),
125 .proc_handler = proc_dointvec
128 .procname = "max_hbh_opts_number",
129 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
130 .maxlen = sizeof(int),
132 .proc_handler = proc_dointvec
135 .procname = "max_dst_opts_length",
136 .data = &init_net.ipv6.sysctl.max_dst_opts_len,
137 .maxlen = sizeof(int),
139 .proc_handler = proc_dointvec
142 .procname = "max_hbh_length",
143 .data = &init_net.ipv6.sysctl.max_hbh_opts_len,
144 .maxlen = sizeof(int),
146 .proc_handler = proc_dointvec
149 .procname = "fib_multipath_hash_policy",
150 .data = &init_net.ipv6.sysctl.multipath_hash_policy,
151 .maxlen = sizeof(int),
153 .proc_handler = proc_rt6_multipath_hash_policy,
154 .extra1 = SYSCTL_ZERO,
158 .procname = "seg6_flowlabel",
159 .data = &init_net.ipv6.sysctl.seg6_flowlabel,
160 .maxlen = sizeof(int),
162 .proc_handler = proc_dointvec
167 static struct ctl_table ipv6_rotable[] = {
169 .procname = "mld_max_msf",
170 .data = &sysctl_mld_max_msf,
171 .maxlen = sizeof(int),
173 .proc_handler = proc_dointvec
176 .procname = "mld_qrv",
177 .data = &sysctl_mld_qrv,
178 .maxlen = sizeof(int),
180 .proc_handler = proc_dointvec_minmax,
183 #ifdef CONFIG_NETLABEL
185 .procname = "calipso_cache_enable",
186 .data = &calipso_cache_enabled,
187 .maxlen = sizeof(int),
189 .proc_handler = proc_dointvec,
192 .procname = "calipso_cache_bucket_size",
193 .data = &calipso_cache_bucketsize,
194 .maxlen = sizeof(int),
196 .proc_handler = proc_dointvec,
198 #endif /* CONFIG_NETLABEL */
202 static int __net_init ipv6_sysctl_net_init(struct net *net)
204 struct ctl_table *ipv6_table;
205 struct ctl_table *ipv6_route_table;
206 struct ctl_table *ipv6_icmp_table;
210 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
214 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
215 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
216 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
217 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
218 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
219 ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
220 ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
221 ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
222 ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
223 ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
224 ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
225 ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
226 ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
227 ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
228 ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
229 ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
231 ipv6_route_table = ipv6_route_sysctl_init(net);
232 if (!ipv6_route_table)
235 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
236 if (!ipv6_icmp_table)
237 goto out_ipv6_route_table;
239 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
240 if (!net->ipv6.sysctl.hdr)
241 goto out_ipv6_icmp_table;
243 net->ipv6.sysctl.route_hdr =
244 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
245 if (!net->ipv6.sysctl.route_hdr)
246 goto out_unregister_ipv6_table;
248 net->ipv6.sysctl.icmp_hdr =
249 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
250 if (!net->ipv6.sysctl.icmp_hdr)
251 goto out_unregister_route_table;
256 out_unregister_route_table:
257 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
258 out_unregister_ipv6_table:
259 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
261 kfree(ipv6_icmp_table);
262 out_ipv6_route_table:
263 kfree(ipv6_route_table);
269 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
271 struct ctl_table *ipv6_table;
272 struct ctl_table *ipv6_route_table;
273 struct ctl_table *ipv6_icmp_table;
275 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
276 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
277 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
279 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
280 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
281 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
284 kfree(ipv6_route_table);
285 kfree(ipv6_icmp_table);
288 static struct pernet_operations ipv6_sysctl_net_ops = {
289 .init = ipv6_sysctl_net_init,
290 .exit = ipv6_sysctl_net_exit,
293 static struct ctl_table_header *ip6_header;
295 int ipv6_sysctl_register(void)
299 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
303 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
310 unregister_net_sysctl_table(ip6_header);
314 void ipv6_sysctl_unregister(void)
316 unregister_net_sysctl_table(ip6_header);
317 unregister_pernet_subsys(&ipv6_sysctl_net_ops);