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 *buffer, size_t *lenp, loff_t *ppos)
34 net = container_of(table->data, struct net,
35 ipv6.sysctl.multipath_hash_policy);
36 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
37 if (write && ret == 0)
38 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
43 static struct ctl_table ipv6_table_template[] = {
45 .procname = "bindv6only",
46 .data = &init_net.ipv6.sysctl.bindv6only,
47 .maxlen = sizeof(int),
49 .proc_handler = proc_dointvec
52 .procname = "anycast_src_echo_reply",
53 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
54 .maxlen = sizeof(int),
56 .proc_handler = proc_dointvec
59 .procname = "flowlabel_consistency",
60 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
61 .maxlen = sizeof(int),
63 .proc_handler = proc_dointvec
66 .procname = "auto_flowlabels",
67 .data = &init_net.ipv6.sysctl.auto_flowlabels,
68 .maxlen = sizeof(int),
70 .proc_handler = proc_dointvec_minmax,
71 .extra1 = &auto_flowlabels_min,
72 .extra2 = &auto_flowlabels_max
75 .procname = "fwmark_reflect",
76 .data = &init_net.ipv6.sysctl.fwmark_reflect,
77 .maxlen = sizeof(int),
79 .proc_handler = proc_dointvec
82 .procname = "idgen_retries",
83 .data = &init_net.ipv6.sysctl.idgen_retries,
84 .maxlen = sizeof(int),
86 .proc_handler = proc_dointvec,
89 .procname = "idgen_delay",
90 .data = &init_net.ipv6.sysctl.idgen_delay,
91 .maxlen = sizeof(int),
93 .proc_handler = proc_dointvec_jiffies,
96 .procname = "flowlabel_state_ranges",
97 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
98 .maxlen = sizeof(int),
100 .proc_handler = proc_dointvec
103 .procname = "ip_nonlocal_bind",
104 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
105 .maxlen = sizeof(int),
107 .proc_handler = proc_dointvec
110 .procname = "flowlabel_reflect",
111 .data = &init_net.ipv6.sysctl.flowlabel_reflect,
112 .maxlen = sizeof(int),
114 .proc_handler = proc_dointvec_minmax,
115 .extra1 = SYSCTL_ZERO,
116 .extra2 = &flowlabel_reflect_max,
119 .procname = "max_dst_opts_number",
120 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
121 .maxlen = sizeof(int),
123 .proc_handler = proc_dointvec
126 .procname = "max_hbh_opts_number",
127 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
128 .maxlen = sizeof(int),
130 .proc_handler = proc_dointvec
133 .procname = "max_dst_opts_length",
134 .data = &init_net.ipv6.sysctl.max_dst_opts_len,
135 .maxlen = sizeof(int),
137 .proc_handler = proc_dointvec
140 .procname = "max_hbh_length",
141 .data = &init_net.ipv6.sysctl.max_hbh_opts_len,
142 .maxlen = sizeof(int),
144 .proc_handler = proc_dointvec
147 .procname = "fib_multipath_hash_policy",
148 .data = &init_net.ipv6.sysctl.multipath_hash_policy,
149 .maxlen = sizeof(int),
151 .proc_handler = proc_rt6_multipath_hash_policy,
152 .extra1 = SYSCTL_ZERO,
153 .extra2 = SYSCTL_ONE,
156 .procname = "seg6_flowlabel",
157 .data = &init_net.ipv6.sysctl.seg6_flowlabel,
158 .maxlen = sizeof(int),
160 .proc_handler = proc_dointvec
165 static struct ctl_table ipv6_rotable[] = {
167 .procname = "mld_max_msf",
168 .data = &sysctl_mld_max_msf,
169 .maxlen = sizeof(int),
171 .proc_handler = proc_dointvec
174 .procname = "mld_qrv",
175 .data = &sysctl_mld_qrv,
176 .maxlen = sizeof(int),
178 .proc_handler = proc_dointvec_minmax,
181 #ifdef CONFIG_NETLABEL
183 .procname = "calipso_cache_enable",
184 .data = &calipso_cache_enabled,
185 .maxlen = sizeof(int),
187 .proc_handler = proc_dointvec,
190 .procname = "calipso_cache_bucket_size",
191 .data = &calipso_cache_bucketsize,
192 .maxlen = sizeof(int),
194 .proc_handler = proc_dointvec,
196 #endif /* CONFIG_NETLABEL */
200 static int __net_init ipv6_sysctl_net_init(struct net *net)
202 struct ctl_table *ipv6_table;
203 struct ctl_table *ipv6_route_table;
204 struct ctl_table *ipv6_icmp_table;
208 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
212 /* Update the variables to point into the current struct net */
213 for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++)
214 ipv6_table[i].data += (void *)net - (void *)&init_net;
216 ipv6_route_table = ipv6_route_sysctl_init(net);
217 if (!ipv6_route_table)
220 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
221 if (!ipv6_icmp_table)
222 goto out_ipv6_route_table;
224 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
225 if (!net->ipv6.sysctl.hdr)
226 goto out_ipv6_icmp_table;
228 net->ipv6.sysctl.route_hdr =
229 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
230 if (!net->ipv6.sysctl.route_hdr)
231 goto out_unregister_ipv6_table;
233 net->ipv6.sysctl.icmp_hdr =
234 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
235 if (!net->ipv6.sysctl.icmp_hdr)
236 goto out_unregister_route_table;
241 out_unregister_route_table:
242 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
243 out_unregister_ipv6_table:
244 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
246 kfree(ipv6_icmp_table);
247 out_ipv6_route_table:
248 kfree(ipv6_route_table);
254 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
256 struct ctl_table *ipv6_table;
257 struct ctl_table *ipv6_route_table;
258 struct ctl_table *ipv6_icmp_table;
260 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
261 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
262 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
264 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
265 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
266 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
269 kfree(ipv6_route_table);
270 kfree(ipv6_icmp_table);
273 static struct pernet_operations ipv6_sysctl_net_ops = {
274 .init = ipv6_sysctl_net_init,
275 .exit = ipv6_sysctl_net_exit,
278 static struct ctl_table_header *ip6_header;
280 int ipv6_sysctl_register(void)
284 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
288 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
295 unregister_net_sysctl_table(ip6_header);
299 void ipv6_sysctl_unregister(void)
301 unregister_net_sysctl_table(ip6_header);
302 unregister_pernet_subsys(&ipv6_sysctl_net_ops);