Merge branch 'linux-linaro-lsk-v3.10' into linux-linaro-lsk-v3.10-android
[firefly-linux-kernel-4.4.55.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 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       = "fwmark_reflect",
29                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
30                 .maxlen         = sizeof(int),
31                 .mode           = 0644,
32                 .proc_handler   = proc_dointvec
33         },
34         { }
35 };
36
37 static 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
62         ipv6_route_table = ipv6_route_sysctl_init(net);
63         if (!ipv6_route_table)
64                 goto out_ipv6_table;
65
66         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
67         if (!ipv6_icmp_table)
68                 goto out_ipv6_route_table;
69
70         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
71         if (!net->ipv6.sysctl.hdr)
72                 goto out_ipv6_icmp_table;
73
74         net->ipv6.sysctl.route_hdr =
75                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
76         if (!net->ipv6.sysctl.route_hdr)
77                 goto out_unregister_ipv6_table;
78
79         net->ipv6.sysctl.icmp_hdr =
80                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
81         if (!net->ipv6.sysctl.icmp_hdr)
82                 goto out_unregister_route_table;
83
84         err = 0;
85 out:
86         return err;
87 out_unregister_route_table:
88         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
89 out_unregister_ipv6_table:
90         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
91 out_ipv6_icmp_table:
92         kfree(ipv6_icmp_table);
93 out_ipv6_route_table:
94         kfree(ipv6_route_table);
95 out_ipv6_table:
96         kfree(ipv6_table);
97         goto out;
98 }
99
100 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
101 {
102         struct ctl_table *ipv6_table;
103         struct ctl_table *ipv6_route_table;
104         struct ctl_table *ipv6_icmp_table;
105
106         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
107         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
108         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
109
110         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
111         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
112         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
113
114         kfree(ipv6_table);
115         kfree(ipv6_route_table);
116         kfree(ipv6_icmp_table);
117 }
118
119 static struct pernet_operations ipv6_sysctl_net_ops = {
120         .init = ipv6_sysctl_net_init,
121         .exit = ipv6_sysctl_net_exit,
122 };
123
124 static struct ctl_table_header *ip6_header;
125
126 int ipv6_sysctl_register(void)
127 {
128         int err = -ENOMEM;
129
130         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
131         if (ip6_header == NULL)
132                 goto out;
133
134         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
135         if (err)
136                 goto err_pernet;
137 out:
138         return err;
139
140 err_pernet:
141         unregister_net_sysctl_table(ip6_header);
142         goto out;
143 }
144
145 void ipv6_sysctl_unregister(void)
146 {
147         unregister_net_sysctl_table(ip6_header);
148         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
149 }