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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#include <net/ip_fib.h>
21#ifdef CONFIG_NETLABEL
22#include <net/calipso.h>
23#endif
24#include <linux/ioam6.h>
25
26static int flowlabel_reflect_max = 0x7;
27static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
28static u32 rt6_multipath_hash_fields_all_mask =
29 FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
30static u32 ioam6_id_max = IOAM6_DEFAULT_ID;
31static u64 ioam6_id_wide_max = IOAM6_DEFAULT_ID_WIDE;
32
33static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
34 void *buffer, size_t *lenp, loff_t *ppos)
35{
36 struct net *net;
37 int ret;
38
39 net = container_of(table->data, struct net,
40 ipv6.sysctl.multipath_hash_policy);
41 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
42 if (write && ret == 0)
43 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
44
45 return ret;
46}
47
48static int
49proc_rt6_multipath_hash_fields(struct ctl_table *table, int write, void *buffer,
50 size_t *lenp, loff_t *ppos)
51{
52 struct net *net;
53 int ret;
54
55 net = container_of(table->data, struct net,
56 ipv6.sysctl.multipath_hash_fields);
57 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
58 if (write && ret == 0)
59 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
60
61 return ret;
62}
63
64static struct ctl_table ipv6_table_template[] = {
65 {
66 .procname = "bindv6only",
67 .data = &init_net.ipv6.sysctl.bindv6only,
68 .maxlen = sizeof(u8),
69 .mode = 0644,
70 .proc_handler = proc_dou8vec_minmax,
71 },
72 {
73 .procname = "anycast_src_echo_reply",
74 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
75 .maxlen = sizeof(u8),
76 .mode = 0644,
77 .proc_handler = proc_dou8vec_minmax,
78 },
79 {
80 .procname = "flowlabel_consistency",
81 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
82 .maxlen = sizeof(u8),
83 .mode = 0644,
84 .proc_handler = proc_dou8vec_minmax,
85 },
86 {
87 .procname = "auto_flowlabels",
88 .data = &init_net.ipv6.sysctl.auto_flowlabels,
89 .maxlen = sizeof(u8),
90 .mode = 0644,
91 .proc_handler = proc_dou8vec_minmax,
92 .extra2 = &auto_flowlabels_max
93 },
94 {
95 .procname = "fwmark_reflect",
96 .data = &init_net.ipv6.sysctl.fwmark_reflect,
97 .maxlen = sizeof(u8),
98 .mode = 0644,
99 .proc_handler = proc_dou8vec_minmax,
100 },
101 {
102 .procname = "idgen_retries",
103 .data = &init_net.ipv6.sysctl.idgen_retries,
104 .maxlen = sizeof(int),
105 .mode = 0644,
106 .proc_handler = proc_dointvec,
107 },
108 {
109 .procname = "idgen_delay",
110 .data = &init_net.ipv6.sysctl.idgen_delay,
111 .maxlen = sizeof(int),
112 .mode = 0644,
113 .proc_handler = proc_dointvec_jiffies,
114 },
115 {
116 .procname = "flowlabel_state_ranges",
117 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
118 .maxlen = sizeof(u8),
119 .mode = 0644,
120 .proc_handler = proc_dou8vec_minmax,
121 },
122 {
123 .procname = "ip_nonlocal_bind",
124 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
125 .maxlen = sizeof(u8),
126 .mode = 0644,
127 .proc_handler = proc_dou8vec_minmax,
128 },
129 {
130 .procname = "flowlabel_reflect",
131 .data = &init_net.ipv6.sysctl.flowlabel_reflect,
132 .maxlen = sizeof(int),
133 .mode = 0644,
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = SYSCTL_ZERO,
136 .extra2 = &flowlabel_reflect_max,
137 },
138 {
139 .procname = "max_dst_opts_number",
140 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
141 .maxlen = sizeof(int),
142 .mode = 0644,
143 .proc_handler = proc_dointvec
144 },
145 {
146 .procname = "max_hbh_opts_number",
147 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
148 .maxlen = sizeof(int),
149 .mode = 0644,
150 .proc_handler = proc_dointvec
151 },
152 {
153 .procname = "max_dst_opts_length",
154 .data = &init_net.ipv6.sysctl.max_dst_opts_len,
155 .maxlen = sizeof(int),
156 .mode = 0644,
157 .proc_handler = proc_dointvec
158 },
159 {
160 .procname = "max_hbh_length",
161 .data = &init_net.ipv6.sysctl.max_hbh_opts_len,
162 .maxlen = sizeof(int),
163 .mode = 0644,
164 .proc_handler = proc_dointvec
165 },
166 {
167 .procname = "fib_multipath_hash_policy",
168 .data = &init_net.ipv6.sysctl.multipath_hash_policy,
169 .maxlen = sizeof(u8),
170 .mode = 0644,
171 .proc_handler = proc_rt6_multipath_hash_policy,
172 .extra1 = SYSCTL_ZERO,
173 .extra2 = SYSCTL_THREE,
174 },
175 {
176 .procname = "fib_multipath_hash_fields",
177 .data = &init_net.ipv6.sysctl.multipath_hash_fields,
178 .maxlen = sizeof(u32),
179 .mode = 0644,
180 .proc_handler = proc_rt6_multipath_hash_fields,
181 .extra1 = SYSCTL_ONE,
182 .extra2 = &rt6_multipath_hash_fields_all_mask,
183 },
184 {
185 .procname = "seg6_flowlabel",
186 .data = &init_net.ipv6.sysctl.seg6_flowlabel,
187 .maxlen = sizeof(int),
188 .mode = 0644,
189 .proc_handler = proc_dointvec
190 },
191 {
192 .procname = "fib_notify_on_flag_change",
193 .data = &init_net.ipv6.sysctl.fib_notify_on_flag_change,
194 .maxlen = sizeof(u8),
195 .mode = 0644,
196 .proc_handler = proc_dou8vec_minmax,
197 .extra1 = SYSCTL_ZERO,
198 .extra2 = SYSCTL_TWO,
199 },
200 {
201 .procname = "ioam6_id",
202 .data = &init_net.ipv6.sysctl.ioam6_id,
203 .maxlen = sizeof(u32),
204 .mode = 0644,
205 .proc_handler = proc_douintvec_minmax,
206 .extra2 = &ioam6_id_max,
207 },
208 {
209 .procname = "ioam6_id_wide",
210 .data = &init_net.ipv6.sysctl.ioam6_id_wide,
211 .maxlen = sizeof(u64),
212 .mode = 0644,
213 .proc_handler = proc_doulongvec_minmax,
214 .extra2 = &ioam6_id_wide_max,
215 },
216 { }
217};
218
219static struct ctl_table ipv6_rotable[] = {
220 {
221 .procname = "mld_max_msf",
222 .data = &sysctl_mld_max_msf,
223 .maxlen = sizeof(int),
224 .mode = 0644,
225 .proc_handler = proc_dointvec
226 },
227 {
228 .procname = "mld_qrv",
229 .data = &sysctl_mld_qrv,
230 .maxlen = sizeof(int),
231 .mode = 0644,
232 .proc_handler = proc_dointvec_minmax,
233 .extra1 = SYSCTL_ONE
234 },
235#ifdef CONFIG_NETLABEL
236 {
237 .procname = "calipso_cache_enable",
238 .data = &calipso_cache_enabled,
239 .maxlen = sizeof(int),
240 .mode = 0644,
241 .proc_handler = proc_dointvec,
242 },
243 {
244 .procname = "calipso_cache_bucket_size",
245 .data = &calipso_cache_bucketsize,
246 .maxlen = sizeof(int),
247 .mode = 0644,
248 .proc_handler = proc_dointvec,
249 },
250#endif /* CONFIG_NETLABEL */
251 { }
252};
253
254static int __net_init ipv6_sysctl_net_init(struct net *net)
255{
256 struct ctl_table *ipv6_table;
257 struct ctl_table *ipv6_route_table;
258 struct ctl_table *ipv6_icmp_table;
259 int err, i;
260
261 err = -ENOMEM;
262 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
263 GFP_KERNEL);
264 if (!ipv6_table)
265 goto out;
266 /* Update the variables to point into the current struct net */
267 for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++)
268 ipv6_table[i].data += (void *)net - (void *)&init_net;
269
270 ipv6_route_table = ipv6_route_sysctl_init(net);
271 if (!ipv6_route_table)
272 goto out_ipv6_table;
273
274 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
275 if (!ipv6_icmp_table)
276 goto out_ipv6_route_table;
277
278 net->ipv6.sysctl.hdr = register_net_sysctl_sz(net, "net/ipv6",
279 ipv6_table,
280 ARRAY_SIZE(ipv6_table_template));
281 if (!net->ipv6.sysctl.hdr)
282 goto out_ipv6_icmp_table;
283
284 net->ipv6.sysctl.route_hdr = register_net_sysctl_sz(net,
285 "net/ipv6/route",
286 ipv6_route_table,
287 ipv6_route_sysctl_table_size(net));
288 if (!net->ipv6.sysctl.route_hdr)
289 goto out_unregister_ipv6_table;
290
291 net->ipv6.sysctl.icmp_hdr = register_net_sysctl_sz(net,
292 "net/ipv6/icmp",
293 ipv6_icmp_table,
294 ipv6_icmp_sysctl_table_size());
295 if (!net->ipv6.sysctl.icmp_hdr)
296 goto out_unregister_route_table;
297
298 err = 0;
299out:
300 return err;
301out_unregister_route_table:
302 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
303out_unregister_ipv6_table:
304 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
305out_ipv6_icmp_table:
306 kfree(ipv6_icmp_table);
307out_ipv6_route_table:
308 kfree(ipv6_route_table);
309out_ipv6_table:
310 kfree(ipv6_table);
311 goto out;
312}
313
314static void __net_exit ipv6_sysctl_net_exit(struct net *net)
315{
316 struct ctl_table *ipv6_table;
317 struct ctl_table *ipv6_route_table;
318 struct ctl_table *ipv6_icmp_table;
319
320 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
321 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
322 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
323
324 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
325 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
326 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
327
328 kfree(ipv6_table);
329 kfree(ipv6_route_table);
330 kfree(ipv6_icmp_table);
331}
332
333static struct pernet_operations ipv6_sysctl_net_ops = {
334 .init = ipv6_sysctl_net_init,
335 .exit = ipv6_sysctl_net_exit,
336};
337
338static struct ctl_table_header *ip6_header;
339
340int ipv6_sysctl_register(void)
341{
342 int err = -ENOMEM;
343
344 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
345 if (!ip6_header)
346 goto out;
347
348 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
349 if (err)
350 goto err_pernet;
351out:
352 return err;
353
354err_pernet:
355 unregister_net_sysctl_table(ip6_header);
356 goto out;
357}
358
359void ipv6_sysctl_unregister(void)
360{
361 unregister_net_sysctl_table(ip6_header);
362 unregister_pernet_subsys(&ipv6_sysctl_net_ops);
363}
1/*
2 * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
3 *
4 * Changes:
5 * YOSHIFUJI Hideaki @USAGI: added icmp sysctl table.
6 */
7
8#include <linux/mm.h>
9#include <linux/sysctl.h>
10#include <linux/in6.h>
11#include <linux/ipv6.h>
12#include <linux/slab.h>
13#include <linux/export.h>
14#include <net/ndisc.h>
15#include <net/ipv6.h>
16#include <net/addrconf.h>
17#include <net/inet_frag.h>
18#ifdef CONFIG_NETLABEL
19#include <net/calipso.h>
20#endif
21
22static int one = 1;
23static int auto_flowlabels_min;
24static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
25
26
27static struct ctl_table ipv6_table_template[] = {
28 {
29 .procname = "bindv6only",
30 .data = &init_net.ipv6.sysctl.bindv6only,
31 .maxlen = sizeof(int),
32 .mode = 0644,
33 .proc_handler = proc_dointvec
34 },
35 {
36 .procname = "anycast_src_echo_reply",
37 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
38 .maxlen = sizeof(int),
39 .mode = 0644,
40 .proc_handler = proc_dointvec
41 },
42 {
43 .procname = "flowlabel_consistency",
44 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
45 .maxlen = sizeof(int),
46 .mode = 0644,
47 .proc_handler = proc_dointvec
48 },
49 {
50 .procname = "auto_flowlabels",
51 .data = &init_net.ipv6.sysctl.auto_flowlabels,
52 .maxlen = sizeof(int),
53 .mode = 0644,
54 .proc_handler = proc_dointvec_minmax,
55 .extra1 = &auto_flowlabels_min,
56 .extra2 = &auto_flowlabels_max
57 },
58 {
59 .procname = "fwmark_reflect",
60 .data = &init_net.ipv6.sysctl.fwmark_reflect,
61 .maxlen = sizeof(int),
62 .mode = 0644,
63 .proc_handler = proc_dointvec
64 },
65 {
66 .procname = "idgen_retries",
67 .data = &init_net.ipv6.sysctl.idgen_retries,
68 .maxlen = sizeof(int),
69 .mode = 0644,
70 .proc_handler = proc_dointvec,
71 },
72 {
73 .procname = "idgen_delay",
74 .data = &init_net.ipv6.sysctl.idgen_delay,
75 .maxlen = sizeof(int),
76 .mode = 0644,
77 .proc_handler = proc_dointvec_jiffies,
78 },
79 {
80 .procname = "flowlabel_state_ranges",
81 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
82 .maxlen = sizeof(int),
83 .mode = 0644,
84 .proc_handler = proc_dointvec
85 },
86 {
87 .procname = "ip_nonlocal_bind",
88 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
89 .maxlen = sizeof(int),
90 .mode = 0644,
91 .proc_handler = proc_dointvec
92 },
93 { }
94};
95
96static struct ctl_table ipv6_rotable[] = {
97 {
98 .procname = "mld_max_msf",
99 .data = &sysctl_mld_max_msf,
100 .maxlen = sizeof(int),
101 .mode = 0644,
102 .proc_handler = proc_dointvec
103 },
104 {
105 .procname = "mld_qrv",
106 .data = &sysctl_mld_qrv,
107 .maxlen = sizeof(int),
108 .mode = 0644,
109 .proc_handler = proc_dointvec_minmax,
110 .extra1 = &one
111 },
112#ifdef CONFIG_NETLABEL
113 {
114 .procname = "calipso_cache_enable",
115 .data = &calipso_cache_enabled,
116 .maxlen = sizeof(int),
117 .mode = 0644,
118 .proc_handler = proc_dointvec,
119 },
120 {
121 .procname = "calipso_cache_bucket_size",
122 .data = &calipso_cache_bucketsize,
123 .maxlen = sizeof(int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec,
126 },
127#endif /* CONFIG_NETLABEL */
128 { }
129};
130
131static int __net_init ipv6_sysctl_net_init(struct net *net)
132{
133 struct ctl_table *ipv6_table;
134 struct ctl_table *ipv6_route_table;
135 struct ctl_table *ipv6_icmp_table;
136 int err;
137
138 err = -ENOMEM;
139 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
140 GFP_KERNEL);
141 if (!ipv6_table)
142 goto out;
143 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
144 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
145 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
146 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
147 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
148 ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
149 ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
150 ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
151 ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
152
153 ipv6_route_table = ipv6_route_sysctl_init(net);
154 if (!ipv6_route_table)
155 goto out_ipv6_table;
156
157 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
158 if (!ipv6_icmp_table)
159 goto out_ipv6_route_table;
160
161 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
162 if (!net->ipv6.sysctl.hdr)
163 goto out_ipv6_icmp_table;
164
165 net->ipv6.sysctl.route_hdr =
166 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
167 if (!net->ipv6.sysctl.route_hdr)
168 goto out_unregister_ipv6_table;
169
170 net->ipv6.sysctl.icmp_hdr =
171 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
172 if (!net->ipv6.sysctl.icmp_hdr)
173 goto out_unregister_route_table;
174
175 err = 0;
176out:
177 return err;
178out_unregister_route_table:
179 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
180out_unregister_ipv6_table:
181 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
182out_ipv6_icmp_table:
183 kfree(ipv6_icmp_table);
184out_ipv6_route_table:
185 kfree(ipv6_route_table);
186out_ipv6_table:
187 kfree(ipv6_table);
188 goto out;
189}
190
191static void __net_exit ipv6_sysctl_net_exit(struct net *net)
192{
193 struct ctl_table *ipv6_table;
194 struct ctl_table *ipv6_route_table;
195 struct ctl_table *ipv6_icmp_table;
196
197 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
198 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
199 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
200
201 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
202 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
203 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
204
205 kfree(ipv6_table);
206 kfree(ipv6_route_table);
207 kfree(ipv6_icmp_table);
208}
209
210static struct pernet_operations ipv6_sysctl_net_ops = {
211 .init = ipv6_sysctl_net_init,
212 .exit = ipv6_sysctl_net_exit,
213};
214
215static struct ctl_table_header *ip6_header;
216
217int ipv6_sysctl_register(void)
218{
219 int err = -ENOMEM;
220
221 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
222 if (!ip6_header)
223 goto out;
224
225 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
226 if (err)
227 goto err_pernet;
228out:
229 return err;
230
231err_pernet:
232 unregister_net_sysctl_table(ip6_header);
233 goto out;
234}
235
236void ipv6_sysctl_unregister(void)
237{
238 unregister_net_sysctl_table(ip6_header);
239 unregister_pernet_subsys(&ipv6_sysctl_net_ops);
240}