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