Revert "udp: remove redundant variable"
[linux-2.6.git] / 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 <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
19 static struct ctl_table empty[1];
20
21 static ctl_table ipv6_static_skeleton[] = {
22         {
23                 .procname       = "neigh",
24                 .maxlen         = 0,
25                 .mode           = 0555,
26                 .child          = empty,
27         },
28         { }
29 };
30
31 static ctl_table ipv6_table_template[] = {
32         {
33                 .procname       = "route",
34                 .maxlen         = 0,
35                 .mode           = 0555,
36                 .child          = ipv6_route_table_template
37         },
38         {
39                 .procname       = "icmp",
40                 .maxlen         = 0,
41                 .mode           = 0555,
42                 .child          = ipv6_icmp_table_template
43         },
44         {
45                 .procname       = "bindv6only",
46                 .data           = &init_net.ipv6.sysctl.bindv6only,
47                 .maxlen         = sizeof(int),
48                 .mode           = 0644,
49                 .proc_handler   = proc_dointvec
50         },
51         { }
52 };
53
54 static ctl_table ipv6_rotable[] = {
55         {
56                 .procname       = "mld_max_msf",
57                 .data           = &sysctl_mld_max_msf,
58                 .maxlen         = sizeof(int),
59                 .mode           = 0644,
60                 .proc_handler   = proc_dointvec
61         },
62         { }
63 };
64
65 struct ctl_path net_ipv6_ctl_path[] = {
66         { .procname = "net", },
67         { .procname = "ipv6", },
68         { },
69 };
70 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
71
72 static int __net_init ipv6_sysctl_net_init(struct net *net)
73 {
74         struct ctl_table *ipv6_table;
75         struct ctl_table *ipv6_route_table;
76         struct ctl_table *ipv6_icmp_table;
77         int err;
78
79         err = -ENOMEM;
80         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
81                              GFP_KERNEL);
82         if (!ipv6_table)
83                 goto out;
84
85         ipv6_route_table = ipv6_route_sysctl_init(net);
86         if (!ipv6_route_table)
87                 goto out_ipv6_table;
88         ipv6_table[0].child = ipv6_route_table;
89
90         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
91         if (!ipv6_icmp_table)
92                 goto out_ipv6_route_table;
93         ipv6_table[1].child = ipv6_icmp_table;
94
95         ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
96
97         net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
98                                                            ipv6_table);
99         if (!net->ipv6.sysctl.table)
100                 goto out_ipv6_icmp_table;
101
102         err = 0;
103 out:
104         return err;
105
106 out_ipv6_icmp_table:
107         kfree(ipv6_icmp_table);
108 out_ipv6_route_table:
109         kfree(ipv6_route_table);
110 out_ipv6_table:
111         kfree(ipv6_table);
112         goto out;
113 }
114
115 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
116 {
117         struct ctl_table *ipv6_table;
118         struct ctl_table *ipv6_route_table;
119         struct ctl_table *ipv6_icmp_table;
120
121         ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
122         ipv6_route_table = ipv6_table[0].child;
123         ipv6_icmp_table = ipv6_table[1].child;
124
125         unregister_net_sysctl_table(net->ipv6.sysctl.table);
126
127         kfree(ipv6_table);
128         kfree(ipv6_route_table);
129         kfree(ipv6_icmp_table);
130 }
131
132 static struct pernet_operations ipv6_sysctl_net_ops = {
133         .init = ipv6_sysctl_net_init,
134         .exit = ipv6_sysctl_net_exit,
135 };
136
137 static struct ctl_table_header *ip6_header;
138
139 int ipv6_sysctl_register(void)
140 {
141         int err = -ENOMEM;
142
143         ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_rotable);
144         if (ip6_header == NULL)
145                 goto out;
146
147         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
148         if (err)
149                 goto err_pernet;
150 out:
151         return err;
152
153 err_pernet:
154         unregister_net_sysctl_table(ip6_header);
155         goto out;
156 }
157
158 void ipv6_sysctl_unregister(void)
159 {
160         unregister_net_sysctl_table(ip6_header);
161         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
162 }
163
164 static struct ctl_table_header *ip6_base;
165
166 int ipv6_static_sysctl_register(void)
167 {
168         ip6_base = register_sysctl_paths(net_ipv6_ctl_path, ipv6_static_skeleton);
169         if (ip6_base == NULL)
170                 return -ENOMEM;
171         return 0;
172 }
173
174 void ipv6_static_sysctl_unregister(void)
175 {
176         unregister_net_sysctl_table(ip6_base);
177 }