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netfilter: nf_tables: minor nf_chain_type cleanups
[~andy/linux] / 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 ipv6_table_template[] = {
20         {
21                 .procname       = "bindv6only",
22                 .data           = &init_net.ipv6.sysctl.bindv6only,
23                 .maxlen         = sizeof(int),
24                 .mode           = 0644,
25                 .proc_handler   = proc_dointvec
26         },
27         {
28                 .procname       = "anycast_src_echo_reply",
29                 .data           = &init_net.ipv6.anycast_src_echo_reply,
30                 .maxlen         = sizeof(int),
31                 .mode           = 0644,
32                 .proc_handler   = proc_dointvec
33         },
34         { }
35 };
36
37 static struct ctl_table ipv6_rotable[] = {
38         {
39                 .procname       = "mld_max_msf",
40                 .data           = &sysctl_mld_max_msf,
41                 .maxlen         = sizeof(int),
42                 .mode           = 0644,
43                 .proc_handler   = proc_dointvec
44         },
45         { }
46 };
47
48 static int __net_init ipv6_sysctl_net_init(struct net *net)
49 {
50         struct ctl_table *ipv6_table;
51         struct ctl_table *ipv6_route_table;
52         struct ctl_table *ipv6_icmp_table;
53         int err;
54
55         err = -ENOMEM;
56         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
57                              GFP_KERNEL);
58         if (!ipv6_table)
59                 goto out;
60         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
61         ipv6_table[1].data = &net->ipv6.anycast_src_echo_reply;
62
63         ipv6_route_table = ipv6_route_sysctl_init(net);
64         if (!ipv6_route_table)
65                 goto out_ipv6_table;
66
67         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
68         if (!ipv6_icmp_table)
69                 goto out_ipv6_route_table;
70
71         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
72         if (!net->ipv6.sysctl.hdr)
73                 goto out_ipv6_icmp_table;
74
75         net->ipv6.sysctl.route_hdr =
76                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
77         if (!net->ipv6.sysctl.route_hdr)
78                 goto out_unregister_ipv6_table;
79
80         net->ipv6.sysctl.icmp_hdr =
81                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
82         if (!net->ipv6.sysctl.icmp_hdr)
83                 goto out_unregister_route_table;
84
85         err = 0;
86 out:
87         return err;
88 out_unregister_route_table:
89         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
90 out_unregister_ipv6_table:
91         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
92 out_ipv6_icmp_table:
93         kfree(ipv6_icmp_table);
94 out_ipv6_route_table:
95         kfree(ipv6_route_table);
96 out_ipv6_table:
97         kfree(ipv6_table);
98         goto out;
99 }
100
101 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
102 {
103         struct ctl_table *ipv6_table;
104         struct ctl_table *ipv6_route_table;
105         struct ctl_table *ipv6_icmp_table;
106
107         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
108         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
109         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
110
111         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
112         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
113         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
114
115         kfree(ipv6_table);
116         kfree(ipv6_route_table);
117         kfree(ipv6_icmp_table);
118 }
119
120 static struct pernet_operations ipv6_sysctl_net_ops = {
121         .init = ipv6_sysctl_net_init,
122         .exit = ipv6_sysctl_net_exit,
123 };
124
125 static struct ctl_table_header *ip6_header;
126
127 int ipv6_sysctl_register(void)
128 {
129         int err = -ENOMEM;
130
131         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
132         if (ip6_header == NULL)
133                 goto out;
134
135         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
136         if (err)
137                 goto err_pernet;
138 out:
139         return err;
140
141 err_pernet:
142         unregister_net_sysctl_table(ip6_header);
143         goto out;
144 }
145
146 void ipv6_sysctl_unregister(void)
147 {
148         unregister_net_sysctl_table(ip6_header);
149         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
150 }