/net/ipv6/sysctl_net_ipv6.c

  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 <net/ndisc.h>
 14#include <net/ipv6.h>
 15#include <net/addrconf.h>
 16#include <net/inet_frag.h>
 17
 18static ctl_table ipv6_table_template[] = {
 19	{
 20		.procname	= "route",
 21		.maxlen		= 0,
 22		.mode		= 0555,
 23		.child		= ipv6_route_table_template
 24	},
 25	{
 26		.procname	= "icmp",
 27		.maxlen		= 0,
 28		.mode		= 0555,
 29		.child		= ipv6_icmp_table_template
 30	},
 31	{
 32		.procname	= "bindv6only",
 33		.data		= &init_net.ipv6.sysctl.bindv6only,
 34		.maxlen		= sizeof(int),
 35		.mode		= 0644,
 36		.proc_handler	= proc_dointvec
 37	},
 38	{ }
 39};
 40
 41static ctl_table ipv6_rotable[] = {
 42	{
 43		.procname	= "mld_max_msf",
 44		.data		= &sysctl_mld_max_msf,
 45		.maxlen		= sizeof(int),
 46		.mode		= 0644,
 47		.proc_handler	= proc_dointvec
 48	},
 49	{ }
 50};
 51
 52struct ctl_path net_ipv6_ctl_path[] = {
 53	{ .procname = "net", },
 54	{ .procname = "ipv6", },
 55	{ },
 56};
 57EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
 58
 59static int __net_init ipv6_sysctl_net_init(struct net *net)
 60{
 61	struct ctl_table *ipv6_table;
 62	struct ctl_table *ipv6_route_table;
 63	struct ctl_table *ipv6_icmp_table;
 64	int err;
 65
 66	err = -ENOMEM;
 67	ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 68			     GFP_KERNEL);
 69	if (!ipv6_table)
 70		goto out;
 71
 72	ipv6_route_table = ipv6_route_sysctl_init(net);
 73	if (!ipv6_route_table)
 74		goto out_ipv6_table;
 75	ipv6_table[0].child = ipv6_route_table;
 76
 77	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 78	if (!ipv6_icmp_table)
 79		goto out_ipv6_route_table;
 80	ipv6_table[1].child = ipv6_icmp_table;
 81
 82	ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
 83
 84	net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
 85							   ipv6_table);
 86	if (!net->ipv6.sysctl.table)
 87		goto out_ipv6_icmp_table;
 88
 89	err = 0;
 90out:
 91	return err;
 92
 93out_ipv6_icmp_table:
 94	kfree(ipv6_icmp_table);
 95out_ipv6_route_table:
 96	kfree(ipv6_route_table);
 97out_ipv6_table:
 98	kfree(ipv6_table);
 99	goto out;
100}
101
102static void __net_exit ipv6_sysctl_net_exit(struct net *net)
103{
104	struct ctl_table *ipv6_table;
105	struct ctl_table *ipv6_route_table;
106	struct ctl_table *ipv6_icmp_table;
107
108	ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
109	ipv6_route_table = ipv6_table[0].child;
110	ipv6_icmp_table = ipv6_table[1].child;
111
112	unregister_net_sysctl_table(net->ipv6.sysctl.table);
113
114	kfree(ipv6_table);
115	kfree(ipv6_route_table);
116	kfree(ipv6_icmp_table);
117}
118
119static struct pernet_operations ipv6_sysctl_net_ops = {
120	.init = ipv6_sysctl_net_init,
121	.exit = ipv6_sysctl_net_exit,
122};
123
124static struct ctl_table_header *ip6_header;
125
126int ipv6_sysctl_register(void)
127{
128	int err = -ENOMEM;
129
130	ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_rotable);
131	if (ip6_header == NULL)
132		goto out;
133
134	err = register_pernet_subsys(&ipv6_sysctl_net_ops);
135	if (err)
136		goto err_pernet;
137out:
138	return err;
139
140err_pernet:
141	unregister_net_sysctl_table(ip6_header);
142	goto out;
143}
144
145void ipv6_sysctl_unregister(void)
146{
147	unregister_net_sysctl_table(ip6_header);
148	unregister_pernet_subsys(&ipv6_sysctl_net_ops);
149}
150
151static struct ctl_table_header *ip6_base;
152
153int ipv6_static_sysctl_register(void)
154{
155	static struct ctl_table empty[1];
156	ip6_base = register_sysctl_paths(net_ipv6_ctl_path, empty);
157	if (ip6_base == NULL)
158		return -ENOMEM;
159	return 0;
160}
161
162void ipv6_static_sysctl_unregister(void)
163{
164	unregister_net_sysctl_table(ip6_base);
165}