summaryrefslogtreecommitdiff
path: root/net/ipv6/sysctl_net_ipv6.c
blob: 408691b777c226c2d0468137d5839cd658f8523d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
 *
 * Changes:
 * YOSHIFUJI Hideaki @USAGI:	added icmp sysctl table.
 */

#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <net/ndisc.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/inet_frag.h>

static ctl_table ipv6_table_template[] = {
	{
		.ctl_name	= NET_IPV6_ROUTE,
		.procname	= "route",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= ipv6_route_table_template
	},
	{
		.ctl_name	= NET_IPV6_ICMP,
		.procname	= "icmp",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= ipv6_icmp_table_template
	},
	{
		.ctl_name	= NET_IPV6_BINDV6ONLY,
		.procname	= "bindv6only",
		.data		= &init_net.ipv6.sysctl.bindv6only,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV6_MLD_MAX_MSF,
		.procname	= "mld_max_msf",
		.data		= &sysctl_mld_max_msf,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{ .ctl_name = 0 }
};

struct ctl_path net_ipv6_ctl_path[] = {
	{ .procname = "net", .ctl_name = CTL_NET, },
	{ .procname = "ipv6", .ctl_name = NET_IPV6, },
	{ },
};
EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);

static int ipv6_sysctl_net_init(struct net *net)
{
	struct ctl_table *ipv6_table;
	struct ctl_table *ipv6_route_table;
	struct ctl_table *ipv6_icmp_table;
	int err;

	err = -ENOMEM;
	ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
			     GFP_KERNEL);
	if (!ipv6_table)
		goto out;

	ipv6_route_table = ipv6_route_sysctl_init(net);
	if (!ipv6_route_table)
		goto out_ipv6_table;

	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
	if (!ipv6_icmp_table)
		goto out_ipv6_route_table;

	ipv6_route_table[0].data = &net->ipv6.sysctl.flush_delay;
	/* ipv6_route_table[1].data will be handled when we have
	   routes per namespace */
	ipv6_route_table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
	ipv6_route_table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
	ipv6_route_table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
	ipv6_route_table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
	ipv6_route_table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
	ipv6_route_table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
	ipv6_route_table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
	ipv6_table[0].child = ipv6_route_table;

	ipv6_icmp_table[0].data = &net->ipv6.sysctl.icmpv6_time;
	ipv6_table[1].child = ipv6_icmp_table;

	ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;

	/* We don't want this value to be per namespace, it should be global
	   to all namespaces, so make it read-only when we are not in the
	   init network namespace */
	if (net != &init_net)
		ipv6_table[3].mode = 0444;

	net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
							   ipv6_table);
	if (!net->ipv6.sysctl.table)
		return -ENOMEM;

	if (!net->ipv6.sysctl.table)
		goto out_ipv6_icmp_table;

	err = 0;
out:
	return err;

out_ipv6_icmp_table:
	kfree(ipv6_icmp_table);
out_ipv6_route_table:
	kfree(ipv6_route_table);
out_ipv6_table:
	kfree(ipv6_table);
	goto out;
}

static void ipv6_sysctl_net_exit(struct net *net)
{
	struct ctl_table *ipv6_table;
	struct ctl_table *ipv6_route_table;
	struct ctl_table *ipv6_icmp_table;

	ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
	ipv6_route_table = ipv6_table[0].child;
	ipv6_icmp_table = ipv6_table[1].child;

	unregister_net_sysctl_table(net->ipv6.sysctl.table);

	kfree(ipv6_table);
	kfree(ipv6_route_table);
	kfree(ipv6_icmp_table);
}

static struct pernet_operations ipv6_sysctl_net_ops = {
	.init = ipv6_sysctl_net_init,
	.exit = ipv6_sysctl_net_exit,
};

int ipv6_sysctl_register(void)
{
	return register_pernet_subsys(&ipv6_sysctl_net_ops);
}

void ipv6_sysctl_unregister(void)
{
	unregister_pernet_subsys(&ipv6_sysctl_net_ops);
}