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
ipv6_sysctl_net_init(struct net * net)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
ipv6_sysctl_net_exit(struct net * net)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
ipv6_sysctl_register(void)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
ipv6_sysctl_unregister(void)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
ipv6_static_sysctl_register(void)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
ipv6_static_sysctl_unregister(void)174 void ipv6_static_sysctl_unregister(void)
175 {
176 unregister_net_sysctl_table(ip6_base);
177 }
178