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
24 static int two = 2;
25 static int flowlabel_reflect_max = 0x7;
26 static int auto_flowlabels_min;
27 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
28
proc_rt6_multipath_hash_policy(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)29 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
30 void __user *buffer, size_t *lenp,
31 loff_t *ppos)
32 {
33 struct net *net;
34 int ret;
35
36 net = container_of(table->data, struct net,
37 ipv6.sysctl.multipath_hash_policy);
38 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
39 if (write && ret == 0)
40 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
41
42 return ret;
43 }
44
45 static struct ctl_table ipv6_table_template[] = {
46 {
47 .procname = "bindv6only",
48 .data = &init_net.ipv6.sysctl.bindv6only,
49 .maxlen = sizeof(int),
50 .mode = 0644,
51 .proc_handler = proc_dointvec
52 },
53 {
54 .procname = "anycast_src_echo_reply",
55 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
56 .maxlen = sizeof(int),
57 .mode = 0644,
58 .proc_handler = proc_dointvec
59 },
60 {
61 .procname = "flowlabel_consistency",
62 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
63 .maxlen = sizeof(int),
64 .mode = 0644,
65 .proc_handler = proc_dointvec
66 },
67 {
68 .procname = "auto_flowlabels",
69 .data = &init_net.ipv6.sysctl.auto_flowlabels,
70 .maxlen = sizeof(int),
71 .mode = 0644,
72 .proc_handler = proc_dointvec_minmax,
73 .extra1 = &auto_flowlabels_min,
74 .extra2 = &auto_flowlabels_max
75 },
76 {
77 .procname = "fwmark_reflect",
78 .data = &init_net.ipv6.sysctl.fwmark_reflect,
79 .maxlen = sizeof(int),
80 .mode = 0644,
81 .proc_handler = proc_dointvec
82 },
83 {
84 .procname = "idgen_retries",
85 .data = &init_net.ipv6.sysctl.idgen_retries,
86 .maxlen = sizeof(int),
87 .mode = 0644,
88 .proc_handler = proc_dointvec,
89 },
90 {
91 .procname = "idgen_delay",
92 .data = &init_net.ipv6.sysctl.idgen_delay,
93 .maxlen = sizeof(int),
94 .mode = 0644,
95 .proc_handler = proc_dointvec_jiffies,
96 },
97 {
98 .procname = "flowlabel_state_ranges",
99 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
100 .maxlen = sizeof(int),
101 .mode = 0644,
102 .proc_handler = proc_dointvec
103 },
104 {
105 .procname = "ip_nonlocal_bind",
106 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
107 .maxlen = sizeof(int),
108 .mode = 0644,
109 .proc_handler = proc_dointvec
110 },
111 {
112 .procname = "flowlabel_reflect",
113 .data = &init_net.ipv6.sysctl.flowlabel_reflect,
114 .maxlen = sizeof(int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = SYSCTL_ZERO,
118 .extra2 = &flowlabel_reflect_max,
119 },
120 {
121 .procname = "max_dst_opts_number",
122 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
123 .maxlen = sizeof(int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec
126 },
127 {
128 .procname = "max_hbh_opts_number",
129 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
130 .maxlen = sizeof(int),
131 .mode = 0644,
132 .proc_handler = proc_dointvec
133 },
134 {
135 .procname = "max_dst_opts_length",
136 .data = &init_net.ipv6.sysctl.max_dst_opts_len,
137 .maxlen = sizeof(int),
138 .mode = 0644,
139 .proc_handler = proc_dointvec
140 },
141 {
142 .procname = "max_hbh_length",
143 .data = &init_net.ipv6.sysctl.max_hbh_opts_len,
144 .maxlen = sizeof(int),
145 .mode = 0644,
146 .proc_handler = proc_dointvec
147 },
148 {
149 .procname = "fib_multipath_hash_policy",
150 .data = &init_net.ipv6.sysctl.multipath_hash_policy,
151 .maxlen = sizeof(int),
152 .mode = 0644,
153 .proc_handler = proc_rt6_multipath_hash_policy,
154 .extra1 = SYSCTL_ZERO,
155 .extra2 = &two,
156 },
157 {
158 .procname = "seg6_flowlabel",
159 .data = &init_net.ipv6.sysctl.seg6_flowlabel,
160 .maxlen = sizeof(int),
161 .mode = 0644,
162 .proc_handler = proc_dointvec
163 },
164 { }
165 };
166
167 static struct ctl_table ipv6_rotable[] = {
168 {
169 .procname = "mld_max_msf",
170 .data = &sysctl_mld_max_msf,
171 .maxlen = sizeof(int),
172 .mode = 0644,
173 .proc_handler = proc_dointvec
174 },
175 {
176 .procname = "mld_qrv",
177 .data = &sysctl_mld_qrv,
178 .maxlen = sizeof(int),
179 .mode = 0644,
180 .proc_handler = proc_dointvec_minmax,
181 .extra1 = SYSCTL_ONE
182 },
183 #ifdef CONFIG_NETLABEL
184 {
185 .procname = "calipso_cache_enable",
186 .data = &calipso_cache_enabled,
187 .maxlen = sizeof(int),
188 .mode = 0644,
189 .proc_handler = proc_dointvec,
190 },
191 {
192 .procname = "calipso_cache_bucket_size",
193 .data = &calipso_cache_bucketsize,
194 .maxlen = sizeof(int),
195 .mode = 0644,
196 .proc_handler = proc_dointvec,
197 },
198 #endif /* CONFIG_NETLABEL */
199 { }
200 };
201
ipv6_sysctl_net_init(struct net * net)202 static int __net_init ipv6_sysctl_net_init(struct net *net)
203 {
204 struct ctl_table *ipv6_table;
205 struct ctl_table *ipv6_route_table;
206 struct ctl_table *ipv6_icmp_table;
207 int err;
208
209 err = -ENOMEM;
210 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
211 GFP_KERNEL);
212 if (!ipv6_table)
213 goto out;
214 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
215 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
216 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
217 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
218 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
219 ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
220 ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
221 ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
222 ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
223 ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
224 ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
225 ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
226 ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
227 ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
228 ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
229 ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
230
231 ipv6_route_table = ipv6_route_sysctl_init(net);
232 if (!ipv6_route_table)
233 goto out_ipv6_table;
234
235 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
236 if (!ipv6_icmp_table)
237 goto out_ipv6_route_table;
238
239 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
240 if (!net->ipv6.sysctl.hdr)
241 goto out_ipv6_icmp_table;
242
243 net->ipv6.sysctl.route_hdr =
244 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
245 if (!net->ipv6.sysctl.route_hdr)
246 goto out_unregister_ipv6_table;
247
248 net->ipv6.sysctl.icmp_hdr =
249 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
250 if (!net->ipv6.sysctl.icmp_hdr)
251 goto out_unregister_route_table;
252
253 err = 0;
254 out:
255 return err;
256 out_unregister_route_table:
257 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
258 out_unregister_ipv6_table:
259 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
260 out_ipv6_icmp_table:
261 kfree(ipv6_icmp_table);
262 out_ipv6_route_table:
263 kfree(ipv6_route_table);
264 out_ipv6_table:
265 kfree(ipv6_table);
266 goto out;
267 }
268
ipv6_sysctl_net_exit(struct net * net)269 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
270 {
271 struct ctl_table *ipv6_table;
272 struct ctl_table *ipv6_route_table;
273 struct ctl_table *ipv6_icmp_table;
274
275 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
276 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
277 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
278
279 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
280 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
281 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
282
283 kfree(ipv6_table);
284 kfree(ipv6_route_table);
285 kfree(ipv6_icmp_table);
286 }
287
288 static struct pernet_operations ipv6_sysctl_net_ops = {
289 .init = ipv6_sysctl_net_init,
290 .exit = ipv6_sysctl_net_exit,
291 };
292
293 static struct ctl_table_header *ip6_header;
294
ipv6_sysctl_register(void)295 int ipv6_sysctl_register(void)
296 {
297 int err = -ENOMEM;
298
299 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
300 if (!ip6_header)
301 goto out;
302
303 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
304 if (err)
305 goto err_pernet;
306 out:
307 return err;
308
309 err_pernet:
310 unregister_net_sysctl_table(ip6_header);
311 goto out;
312 }
313
ipv6_sysctl_unregister(void)314 void ipv6_sysctl_unregister(void)
315 {
316 unregister_net_sysctl_table(ip6_header);
317 unregister_pernet_subsys(&ipv6_sysctl_net_ops);
318 }
319