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
19static int one = 1;
20
21static struct ctl_table ipv6_table_template[] = {
22	{
23		.procname	= "bindv6only",
24		.data		= &init_net.ipv6.sysctl.bindv6only,
25		.maxlen		= sizeof(int),
26		.mode		= 0644,
27		.proc_handler	= proc_dointvec
28	},
29	{
30		.procname	= "anycast_src_echo_reply",
31		.data		= &init_net.ipv6.sysctl.anycast_src_echo_reply,
32		.maxlen		= sizeof(int),
33		.mode		= 0644,
34		.proc_handler	= proc_dointvec
35	},
36	{
37		.procname	= "flowlabel_consistency",
38		.data		= &init_net.ipv6.sysctl.flowlabel_consistency,
39		.maxlen		= sizeof(int),
40		.mode		= 0644,
41		.proc_handler	= proc_dointvec
42	},
43	{
44		.procname	= "auto_flowlabels",
45		.data		= &init_net.ipv6.sysctl.auto_flowlabels,
46		.maxlen		= sizeof(int),
47		.mode		= 0644,
48		.proc_handler	= proc_dointvec
49	},
50	{
51		.procname	= "fwmark_reflect",
52		.data		= &init_net.ipv6.sysctl.fwmark_reflect,
53		.maxlen		= sizeof(int),
54		.mode		= 0644,
55		.proc_handler	= proc_dointvec
56	},
57	{
58		.procname	= "idgen_retries",
59		.data		= &init_net.ipv6.sysctl.idgen_retries,
60		.maxlen		= sizeof(int),
61		.mode		= 0644,
62		.proc_handler	= proc_dointvec,
63	},
64	{
65		.procname	= "idgen_delay",
66		.data		= &init_net.ipv6.sysctl.idgen_delay,
67		.maxlen		= sizeof(int),
68		.mode		= 0644,
69		.proc_handler	= proc_dointvec_jiffies,
70	},
71	{ }
72};
73
74static struct ctl_table ipv6_rotable[] = {
75	{
76		.procname	= "mld_max_msf",
77		.data		= &sysctl_mld_max_msf,
78		.maxlen		= sizeof(int),
79		.mode		= 0644,
80		.proc_handler	= proc_dointvec
81	},
82	{
83		.procname	= "mld_qrv",
84		.data		= &sysctl_mld_qrv,
85		.maxlen		= sizeof(int),
86		.mode		= 0644,
87		.proc_handler	= proc_dointvec_minmax,
88		.extra1		= &one
89	},
90	{ }
91};
92
93static int __net_init ipv6_sysctl_net_init(struct net *net)
94{
95	struct ctl_table *ipv6_table;
96	struct ctl_table *ipv6_route_table;
97	struct ctl_table *ipv6_icmp_table;
98	int err;
99
100	err = -ENOMEM;
101	ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
102			     GFP_KERNEL);
103	if (!ipv6_table)
104		goto out;
105	ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
106	ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
107	ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
108	ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
109	ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
110	ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
111	ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
112
113	ipv6_route_table = ipv6_route_sysctl_init(net);
114	if (!ipv6_route_table)
115		goto out_ipv6_table;
116
117	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
118	if (!ipv6_icmp_table)
119		goto out_ipv6_route_table;
120
121	net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
122	if (!net->ipv6.sysctl.hdr)
123		goto out_ipv6_icmp_table;
124
125	net->ipv6.sysctl.route_hdr =
126		register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
127	if (!net->ipv6.sysctl.route_hdr)
128		goto out_unregister_ipv6_table;
129
130	net->ipv6.sysctl.icmp_hdr =
131		register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
132	if (!net->ipv6.sysctl.icmp_hdr)
133		goto out_unregister_route_table;
134
135	err = 0;
136out:
137	return err;
138out_unregister_route_table:
139	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
140out_unregister_ipv6_table:
141	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
142out_ipv6_icmp_table:
143	kfree(ipv6_icmp_table);
144out_ipv6_route_table:
145	kfree(ipv6_route_table);
146out_ipv6_table:
147	kfree(ipv6_table);
148	goto out;
149}
150
151static void __net_exit ipv6_sysctl_net_exit(struct net *net)
152{
153	struct ctl_table *ipv6_table;
154	struct ctl_table *ipv6_route_table;
155	struct ctl_table *ipv6_icmp_table;
156
157	ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
158	ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
159	ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
160
161	unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
162	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
163	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
164
165	kfree(ipv6_table);
166	kfree(ipv6_route_table);
167	kfree(ipv6_icmp_table);
168}
169
170static struct pernet_operations ipv6_sysctl_net_ops = {
171	.init = ipv6_sysctl_net_init,
172	.exit = ipv6_sysctl_net_exit,
173};
174
175static struct ctl_table_header *ip6_header;
176
177int ipv6_sysctl_register(void)
178{
179	int err = -ENOMEM;
180
181	ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
182	if (!ip6_header)
183		goto out;
184
185	err = register_pernet_subsys(&ipv6_sysctl_net_ops);
186	if (err)
187		goto err_pernet;
188out:
189	return err;
190
191err_pernet:
192	unregister_net_sysctl_table(ip6_header);
193	goto out;
194}
195
196void ipv6_sysctl_unregister(void)
197{
198	unregister_net_sysctl_table(ip6_header);
199	unregister_pernet_subsys(&ipv6_sysctl_net_ops);
200}
201