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
26 static int flowlabel_reflect_max = 0x7;
27 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
28 static u32 rt6_multipath_hash_fields_all_mask =
29 FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
30 static u32 ioam6_id_max = IOAM6_DEFAULT_ID;
31 static u64 ioam6_id_wide_max = IOAM6_DEFAULT_ID_WIDE;
32
proc_rt6_multipath_hash_policy(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)33 static 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
48 static int
proc_rt6_multipath_hash_fields(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)49 proc_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
64 static 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 static struct ctl_table ipv6_rotable[] = {
219 {
220 .procname = "mld_max_msf",
221 .data = &sysctl_mld_max_msf,
222 .maxlen = sizeof(int),
223 .mode = 0644,
224 .proc_handler = proc_dointvec
225 },
226 {
227 .procname = "mld_qrv",
228 .data = &sysctl_mld_qrv,
229 .maxlen = sizeof(int),
230 .mode = 0644,
231 .proc_handler = proc_dointvec_minmax,
232 .extra1 = SYSCTL_ONE
233 },
234 #ifdef CONFIG_NETLABEL
235 {
236 .procname = "calipso_cache_enable",
237 .data = &calipso_cache_enabled,
238 .maxlen = sizeof(int),
239 .mode = 0644,
240 .proc_handler = proc_dointvec,
241 },
242 {
243 .procname = "calipso_cache_bucket_size",
244 .data = &calipso_cache_bucketsize,
245 .maxlen = sizeof(int),
246 .mode = 0644,
247 .proc_handler = proc_dointvec,
248 },
249 #endif /* CONFIG_NETLABEL */
250 };
251
ipv6_sysctl_net_init(struct net * net)252 static int __net_init ipv6_sysctl_net_init(struct net *net)
253 {
254 size_t table_size = ARRAY_SIZE(ipv6_table_template);
255 struct ctl_table *ipv6_table;
256 struct ctl_table *ipv6_route_table;
257 struct ctl_table *ipv6_icmp_table;
258 int err, i;
259
260 err = -ENOMEM;
261 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
262 GFP_KERNEL);
263 if (!ipv6_table)
264 goto out;
265 /* Update the variables to point into the current struct net */
266 for (i = 0; i < table_size; i++)
267 ipv6_table[i].data += (void *)net - (void *)&init_net;
268
269 ipv6_route_table = ipv6_route_sysctl_init(net);
270 if (!ipv6_route_table)
271 goto out_ipv6_table;
272
273 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
274 if (!ipv6_icmp_table)
275 goto out_ipv6_route_table;
276
277 net->ipv6.sysctl.hdr = register_net_sysctl_sz(net, "net/ipv6",
278 ipv6_table, table_size);
279 if (!net->ipv6.sysctl.hdr)
280 goto out_ipv6_icmp_table;
281
282 net->ipv6.sysctl.route_hdr = register_net_sysctl_sz(net,
283 "net/ipv6/route",
284 ipv6_route_table,
285 ipv6_route_sysctl_table_size(net));
286 if (!net->ipv6.sysctl.route_hdr)
287 goto out_unregister_ipv6_table;
288
289 net->ipv6.sysctl.icmp_hdr = register_net_sysctl_sz(net,
290 "net/ipv6/icmp",
291 ipv6_icmp_table,
292 ipv6_icmp_sysctl_table_size());
293 if (!net->ipv6.sysctl.icmp_hdr)
294 goto out_unregister_route_table;
295
296 err = 0;
297 out:
298 return err;
299 out_unregister_route_table:
300 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
301 out_unregister_ipv6_table:
302 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
303 out_ipv6_icmp_table:
304 kfree(ipv6_icmp_table);
305 out_ipv6_route_table:
306 kfree(ipv6_route_table);
307 out_ipv6_table:
308 kfree(ipv6_table);
309 goto out;
310 }
311
ipv6_sysctl_net_exit(struct net * net)312 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
313 {
314 const struct ctl_table *ipv6_table;
315 const struct ctl_table *ipv6_route_table;
316 const struct ctl_table *ipv6_icmp_table;
317
318 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
319 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
320 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
321
322 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
323 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
324 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
325
326 kfree(ipv6_table);
327 kfree(ipv6_route_table);
328 kfree(ipv6_icmp_table);
329 }
330
331 static struct pernet_operations ipv6_sysctl_net_ops = {
332 .init = ipv6_sysctl_net_init,
333 .exit = ipv6_sysctl_net_exit,
334 };
335
336 static struct ctl_table_header *ip6_header;
337
ipv6_sysctl_register(void)338 int ipv6_sysctl_register(void)
339 {
340 int err = -ENOMEM;
341
342 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
343 if (!ip6_header)
344 goto out;
345
346 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
347 if (err)
348 goto err_pernet;
349 out:
350 return err;
351
352 err_pernet:
353 unregister_net_sysctl_table(ip6_header);
354 goto out;
355 }
356
ipv6_sysctl_unregister(void)357 void ipv6_sysctl_unregister(void)
358 {
359 unregister_net_sysctl_table(ip6_header);
360 unregister_pernet_subsys(&ipv6_sysctl_net_ops);
361 }
362