Merge branch 'spi-5.3' into spi-linus
[sfrench/cifs-2.6.git] / net / ipv6 / sysctl_net_ipv6.c
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 flowlabel_reflect_max = 0x7;
25 static int auto_flowlabels_min;
26 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
27
28 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
29                                           void __user *buffer, size_t *lenp,
30                                           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
44 static 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         = SYSCTL_ONE,
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
166 static 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
201 static 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;
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         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
214         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
215         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
216         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
217         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
218         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
219         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
220         ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;
221         ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;
222         ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;
223         ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt;
224         ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt;
225         ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
226         ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
227         ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
228         ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
229
230         ipv6_route_table = ipv6_route_sysctl_init(net);
231         if (!ipv6_route_table)
232                 goto out_ipv6_table;
233
234         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
235         if (!ipv6_icmp_table)
236                 goto out_ipv6_route_table;
237
238         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
239         if (!net->ipv6.sysctl.hdr)
240                 goto out_ipv6_icmp_table;
241
242         net->ipv6.sysctl.route_hdr =
243                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
244         if (!net->ipv6.sysctl.route_hdr)
245                 goto out_unregister_ipv6_table;
246
247         net->ipv6.sysctl.icmp_hdr =
248                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
249         if (!net->ipv6.sysctl.icmp_hdr)
250                 goto out_unregister_route_table;
251
252         err = 0;
253 out:
254         return err;
255 out_unregister_route_table:
256         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
257 out_unregister_ipv6_table:
258         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
259 out_ipv6_icmp_table:
260         kfree(ipv6_icmp_table);
261 out_ipv6_route_table:
262         kfree(ipv6_route_table);
263 out_ipv6_table:
264         kfree(ipv6_table);
265         goto out;
266 }
267
268 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
269 {
270         struct ctl_table *ipv6_table;
271         struct ctl_table *ipv6_route_table;
272         struct ctl_table *ipv6_icmp_table;
273
274         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
275         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
276         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
277
278         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
279         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
280         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
281
282         kfree(ipv6_table);
283         kfree(ipv6_route_table);
284         kfree(ipv6_icmp_table);
285 }
286
287 static struct pernet_operations ipv6_sysctl_net_ops = {
288         .init = ipv6_sysctl_net_init,
289         .exit = ipv6_sysctl_net_exit,
290 };
291
292 static struct ctl_table_header *ip6_header;
293
294 int ipv6_sysctl_register(void)
295 {
296         int err = -ENOMEM;
297
298         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
299         if (!ip6_header)
300                 goto out;
301
302         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
303         if (err)
304                 goto err_pernet;
305 out:
306         return err;
307
308 err_pernet:
309         unregister_net_sysctl_table(ip6_header);
310         goto out;
311 }
312
313 void ipv6_sysctl_unregister(void)
314 {
315         unregister_net_sysctl_table(ip6_header);
316         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
317 }