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>
26 static int flowlabel_reflect_max = 0x7;
27 static int auto_flowlabels_min;
28 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
30 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
31 void __user *buffer, size_t *lenp,
37 net = container_of(table->data, struct net,
38 ipv6.sysctl.multipath_hash_policy);
39 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
40 if (write && ret == 0)
41 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
46 static struct ctl_table ipv6_table_template[] = {
48 .procname = "bindv6only",
49 .data = &init_net.ipv6.sysctl.bindv6only,
50 .maxlen = sizeof(int),
52 .proc_handler = proc_dointvec
55 .procname = "anycast_src_echo_reply",
56 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
57 .maxlen = sizeof(int),
59 .proc_handler = proc_dointvec
62 .procname = "flowlabel_consistency",
63 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
64 .maxlen = sizeof(int),
66 .proc_handler = proc_dointvec
69 .procname = "auto_flowlabels",
70 .data = &init_net.ipv6.sysctl.auto_flowlabels,
71 .maxlen = sizeof(int),
73 .proc_handler = proc_dointvec_minmax,
74 .extra1 = &auto_flowlabels_min,
75 .extra2 = &auto_flowlabels_max
78 .procname = "fwmark_reflect",
79 .data = &init_net.ipv6.sysctl.fwmark_reflect,
80 .maxlen = sizeof(int),
82 .proc_handler = proc_dointvec
85 .procname = "idgen_retries",
86 .data = &init_net.ipv6.sysctl.idgen_retries,
87 .maxlen = sizeof(int),
89 .proc_handler = proc_dointvec,
92 .procname = "idgen_delay",
93 .data = &init_net.ipv6.sysctl.idgen_delay,
94 .maxlen = sizeof(int),
96 .proc_handler = proc_dointvec_jiffies,
99 .procname = "flowlabel_state_ranges",
100 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
101 .maxlen = sizeof(int),
103 .proc_handler = proc_dointvec
106 .procname = "ip_nonlocal_bind",
107 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
108 .maxlen = sizeof(int),
110 .proc_handler = proc_dointvec
113 .procname = "flowlabel_reflect",
114 .data = &init_net.ipv6.sysctl.flowlabel_reflect,
115 .maxlen = sizeof(int),
117 .proc_handler = proc_dointvec_minmax,
119 .extra2 = &flowlabel_reflect_max,
122 .procname = "max_dst_opts_number",
123 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
124 .maxlen = sizeof(int),
126 .proc_handler = proc_dointvec
129 .procname = "max_hbh_opts_number",
130 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
131 .maxlen = sizeof(int),
133 .proc_handler = proc_dointvec
136 .procname = "max_dst_opts_length",
137 .data = &init_net.ipv6.sysctl.max_dst_opts_len,
138 .maxlen = sizeof(int),
140 .proc_handler = proc_dointvec
143 .procname = "max_hbh_length",
144 .data = &init_net.ipv6.sysctl.max_hbh_opts_len,
145 .maxlen = sizeof(int),
147 .proc_handler = proc_dointvec
150 .procname = "fib_multipath_hash_policy",
151 .data = &init_net.ipv6.sysctl.multipath_hash_policy,
152 .maxlen = sizeof(int),
154 .proc_handler = proc_rt6_multipath_hash_policy,
159 .procname = "seg6_flowlabel",
160 .data = &init_net.ipv6.sysctl.seg6_flowlabel,
161 .maxlen = sizeof(int),
163 .proc_handler = proc_dointvec
168 static struct ctl_table ipv6_rotable[] = {
170 .procname = "mld_max_msf",
171 .data = &sysctl_mld_max_msf,
172 .maxlen = sizeof(int),
174 .proc_handler = proc_dointvec
177 .procname = "mld_qrv",
178 .data = &sysctl_mld_qrv,
179 .maxlen = sizeof(int),
181 .proc_handler = proc_dointvec_minmax,
184 #ifdef CONFIG_NETLABEL
186 .procname = "calipso_cache_enable",
187 .data = &calipso_cache_enabled,
188 .maxlen = sizeof(int),
190 .proc_handler = proc_dointvec,
193 .procname = "calipso_cache_bucket_size",
194 .data = &calipso_cache_bucketsize,
195 .maxlen = sizeof(int),
197 .proc_handler = proc_dointvec,
199 #endif /* CONFIG_NETLABEL */
203 static int __net_init ipv6_sysctl_net_init(struct net *net)
205 struct ctl_table *ipv6_table;
206 struct ctl_table *ipv6_route_table;
207 struct ctl_table *ipv6_icmp_table;
211 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
215 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
216 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
217 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
218 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
219 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
220 ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
221 ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
222 ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
223 ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
224 ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
225 ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
226 ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
227 ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
228 ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
229 ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
230 ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
232 ipv6_route_table = ipv6_route_sysctl_init(net);
233 if (!ipv6_route_table)
236 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
237 if (!ipv6_icmp_table)
238 goto out_ipv6_route_table;
240 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
241 if (!net->ipv6.sysctl.hdr)
242 goto out_ipv6_icmp_table;
244 net->ipv6.sysctl.route_hdr =
245 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
246 if (!net->ipv6.sysctl.route_hdr)
247 goto out_unregister_ipv6_table;
249 net->ipv6.sysctl.icmp_hdr =
250 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
251 if (!net->ipv6.sysctl.icmp_hdr)
252 goto out_unregister_route_table;
257 out_unregister_route_table:
258 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
259 out_unregister_ipv6_table:
260 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
262 kfree(ipv6_icmp_table);
263 out_ipv6_route_table:
264 kfree(ipv6_route_table);
270 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
272 struct ctl_table *ipv6_table;
273 struct ctl_table *ipv6_route_table;
274 struct ctl_table *ipv6_icmp_table;
276 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
277 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
278 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
280 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
281 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
282 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
285 kfree(ipv6_route_table);
286 kfree(ipv6_icmp_table);
289 static struct pernet_operations ipv6_sysctl_net_ops = {
290 .init = ipv6_sysctl_net_init,
291 .exit = ipv6_sysctl_net_exit,
294 static struct ctl_table_header *ip6_header;
296 int ipv6_sysctl_register(void)
300 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
304 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
311 unregister_net_sysctl_table(ip6_header);
315 void ipv6_sysctl_unregister(void)
317 unregister_net_sysctl_table(ip6_header);
318 unregister_pernet_subsys(&ipv6_sysctl_net_ops);