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 <net/ndisc.h>
13 #include <net/ipv6.h>
14 #include <net/addrconf.h>
15 #include <net/inet_frag.h>
16
17 static ctl_table ipv6_table_template[] = {
18 {
19 .ctl_name = NET_IPV6_ROUTE,
20 .procname = "route",
21 .maxlen = 0,
22 .mode = 0555,
23 .child = ipv6_route_table_template
24 },
25 {
26 .ctl_name = NET_IPV6_ICMP,
27 .procname = "icmp",
28 .maxlen = 0,
29 .mode = 0555,
30 .child = ipv6_icmp_table_template
31 },
32 {
33 .ctl_name = NET_IPV6_BINDV6ONLY,
34 .procname = "bindv6only",
35 .data = &init_net.ipv6.sysctl.bindv6only,
36 .maxlen = sizeof(int),
37 .mode = 0644,
38 .proc_handler = proc_dointvec
39 },
40 { .ctl_name = 0 }
41 };
42
43 static ctl_table ipv6_table[] = {
44 {
45 .ctl_name = NET_IPV6_MLD_MAX_MSF,
46 .procname = "mld_max_msf",
47 .data = &sysctl_mld_max_msf,
48 .maxlen = sizeof(int),
49 .mode = 0644,
50 .proc_handler = proc_dointvec
51 },
52 { .ctl_name = 0 }
53 };
54
55 struct ctl_path net_ipv6_ctl_path[] = {
56 { .procname = "net", .ctl_name = CTL_NET, },
57 { .procname = "ipv6", .ctl_name = NET_IPV6, },
58 { },
59 };
60 EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
61
ipv6_sysctl_net_init(struct net * net)62 static int ipv6_sysctl_net_init(struct net *net)
63 {
64 struct ctl_table *ipv6_table;
65 struct ctl_table *ipv6_route_table;
66 struct ctl_table *ipv6_icmp_table;
67 int err;
68
69 err = -ENOMEM;
70 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
71 GFP_KERNEL);
72 if (!ipv6_table)
73 goto out;
74
75 ipv6_route_table = ipv6_route_sysctl_init(net);
76 if (!ipv6_route_table)
77 goto out_ipv6_table;
78 ipv6_table[0].child = ipv6_route_table;
79
80 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
81 if (!ipv6_icmp_table)
82 goto out_ipv6_route_table;
83 ipv6_table[1].child = ipv6_icmp_table;
84
85 ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
86
87 net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
88 ipv6_table);
89 if (!net->ipv6.sysctl.table)
90 goto out_ipv6_icmp_table;
91
92 err = 0;
93 out:
94 return err;
95
96 out_ipv6_icmp_table:
97 kfree(ipv6_icmp_table);
98 out_ipv6_route_table:
99 kfree(ipv6_route_table);
100 out_ipv6_table:
101 kfree(ipv6_table);
102 goto out;
103 }
104
ipv6_sysctl_net_exit(struct net * net)105 static void ipv6_sysctl_net_exit(struct net *net)
106 {
107 struct ctl_table *ipv6_table;
108 struct ctl_table *ipv6_route_table;
109 struct ctl_table *ipv6_icmp_table;
110
111 ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
112 ipv6_route_table = ipv6_table[0].child;
113 ipv6_icmp_table = ipv6_table[1].child;
114
115 unregister_net_sysctl_table(net->ipv6.sysctl.table);
116
117 kfree(ipv6_table);
118 kfree(ipv6_route_table);
119 kfree(ipv6_icmp_table);
120 }
121
122 static struct pernet_operations ipv6_sysctl_net_ops = {
123 .init = ipv6_sysctl_net_init,
124 .exit = ipv6_sysctl_net_exit,
125 };
126
127 static struct ctl_table_header *ip6_header;
128
ipv6_sysctl_register(void)129 int ipv6_sysctl_register(void)
130 {
131 int err = -ENOMEM;
132
133 ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_table);
134 if (ip6_header == NULL)
135 goto out;
136
137 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
138 if (err)
139 goto err_pernet;
140 out:
141 return err;
142
143 err_pernet:
144 unregister_net_sysctl_table(ip6_header);
145 goto out;
146 }
147
ipv6_sysctl_unregister(void)148 void ipv6_sysctl_unregister(void)
149 {
150 unregister_net_sysctl_table(ip6_header);
151 unregister_pernet_subsys(&ipv6_sysctl_net_ops);
152 }
153
154 static struct ctl_table_header *ip6_base;
155
ipv6_static_sysctl_register(void)156 int ipv6_static_sysctl_register(void)
157 {
158 static struct ctl_table empty[1];
159 ip6_base = register_sysctl_paths(net_ipv6_ctl_path, empty);
160 if (ip6_base == NULL)
161 return -ENOMEM;
162 return 0;
163 }
164
ipv6_static_sysctl_unregister(void)165 void ipv6_static_sysctl_unregister(void)
166 {
167 unregister_net_sysctl_table(ip6_base);
168 }
169