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 int one = 1;
20
21 static struct ctl_table ipv6_table_template[] = {
22 {
23 .procname = "bindv6only",
24 .data = &init_net.ipv6.sysctl.bindv6only,
25 .maxlen = sizeof(int),
26 .mode = 0644,
27 .proc_handler = proc_dointvec
28 },
29 {
30 .procname = "anycast_src_echo_reply",
31 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
32 .maxlen = sizeof(int),
33 .mode = 0644,
34 .proc_handler = proc_dointvec
35 },
36 {
37 .procname = "flowlabel_consistency",
38 .data = &init_net.ipv6.sysctl.flowlabel_consistency,
39 .maxlen = sizeof(int),
40 .mode = 0644,
41 .proc_handler = proc_dointvec
42 },
43 {
44 .procname = "auto_flowlabels",
45 .data = &init_net.ipv6.sysctl.auto_flowlabels,
46 .maxlen = sizeof(int),
47 .mode = 0644,
48 .proc_handler = proc_dointvec
49 },
50 {
51 .procname = "fwmark_reflect",
52 .data = &init_net.ipv6.sysctl.fwmark_reflect,
53 .maxlen = sizeof(int),
54 .mode = 0644,
55 .proc_handler = proc_dointvec
56 },
57 { }
58 };
59
60 static struct ctl_table ipv6_rotable[] = {
61 {
62 .procname = "mld_max_msf",
63 .data = &sysctl_mld_max_msf,
64 .maxlen = sizeof(int),
65 .mode = 0644,
66 .proc_handler = proc_dointvec
67 },
68 {
69 .procname = "mld_qrv",
70 .data = &sysctl_mld_qrv,
71 .maxlen = sizeof(int),
72 .mode = 0644,
73 .proc_handler = proc_dointvec_minmax,
74 .extra1 = &one
75 },
76 { }
77 };
78
ipv6_sysctl_net_init(struct net * net)79 static int __net_init ipv6_sysctl_net_init(struct net *net)
80 {
81 struct ctl_table *ipv6_table;
82 struct ctl_table *ipv6_route_table;
83 struct ctl_table *ipv6_icmp_table;
84 int err;
85
86 err = -ENOMEM;
87 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
88 GFP_KERNEL);
89 if (!ipv6_table)
90 goto out;
91 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
92 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
93 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
94 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
95 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
96
97 ipv6_route_table = ipv6_route_sysctl_init(net);
98 if (!ipv6_route_table)
99 goto out_ipv6_table;
100
101 ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
102 if (!ipv6_icmp_table)
103 goto out_ipv6_route_table;
104
105 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
106 if (!net->ipv6.sysctl.hdr)
107 goto out_ipv6_icmp_table;
108
109 net->ipv6.sysctl.route_hdr =
110 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
111 if (!net->ipv6.sysctl.route_hdr)
112 goto out_unregister_ipv6_table;
113
114 net->ipv6.sysctl.icmp_hdr =
115 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
116 if (!net->ipv6.sysctl.icmp_hdr)
117 goto out_unregister_route_table;
118
119 err = 0;
120 out:
121 return err;
122 out_unregister_route_table:
123 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
124 out_unregister_ipv6_table:
125 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
126 out_ipv6_icmp_table:
127 kfree(ipv6_icmp_table);
128 out_ipv6_route_table:
129 kfree(ipv6_route_table);
130 out_ipv6_table:
131 kfree(ipv6_table);
132 goto out;
133 }
134
ipv6_sysctl_net_exit(struct net * net)135 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
136 {
137 struct ctl_table *ipv6_table;
138 struct ctl_table *ipv6_route_table;
139 struct ctl_table *ipv6_icmp_table;
140
141 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
142 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
143 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
144
145 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
146 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
147 unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
148
149 kfree(ipv6_table);
150 kfree(ipv6_route_table);
151 kfree(ipv6_icmp_table);
152 }
153
154 static struct pernet_operations ipv6_sysctl_net_ops = {
155 .init = ipv6_sysctl_net_init,
156 .exit = ipv6_sysctl_net_exit,
157 };
158
159 static struct ctl_table_header *ip6_header;
160
ipv6_sysctl_register(void)161 int ipv6_sysctl_register(void)
162 {
163 int err = -ENOMEM;
164
165 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
166 if (ip6_header == NULL)
167 goto out;
168
169 err = register_pernet_subsys(&ipv6_sysctl_net_ops);
170 if (err)
171 goto err_pernet;
172 out:
173 return err;
174
175 err_pernet:
176 unregister_net_sysctl_table(ip6_header);
177 goto out;
178 }
179
ipv6_sysctl_unregister(void)180 void ipv6_sysctl_unregister(void)
181 {
182 unregister_net_sysctl_table(ip6_header);
183 unregister_pernet_subsys(&ipv6_sysctl_net_ops);
184 }
185