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1 | /* -*- linux-c -*- |
2 | * sysctl_net.c: sysctl interface to net subsystem. |
3 | * |
4 | * Begun April 1, 1996, Mike Shaver. |
5 | * Added /proc/sys/net directories for each protocol family. [MS] |
6 | * |
7 | * Revision 1.2 1996/05/08 20:24:40 shaver |
8 | * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and |
9 | * NET_IPV4_IP_FORWARD. |
10 | * |
11 | * |
12 | */ |
13 | |
14 | #include <linux/mm.h> |
15 | #include <linux/export.h> |
16 | #include <linux/sysctl.h> |
17 | #include <linux/nsproxy.h> |
18 | |
19 | #include <net/sock.h> |
20 | |
21 | #ifdef CONFIG_INET |
22 | #include <net/ip.h> |
23 | #endif |
24 | |
25 | #ifdef CONFIG_NET |
26 | #include <linux/if_ether.h> |
27 | #endif |
28 | |
29 | #ifdef CONFIG_TR |
30 | #include <linux/if_tr.h> |
31 | #endif |
32 | |
33 | static struct ctl_table_set * |
34 | net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces) |
35 | { |
36 | return &namespaces->net_ns->sysctls; |
37 | } |
38 | |
39 | static int is_seen(struct ctl_table_set *set) |
40 | { |
41 | return ¤t->nsproxy->net_ns->sysctls == set; |
42 | } |
43 | |
44 | /* Return standard mode bits for table entry. */ |
45 | static int net_ctl_permissions(struct ctl_table_root *root, |
46 | struct nsproxy *nsproxy, |
47 | struct ctl_table *table) |
48 | { |
49 | /* Allow network administrator to have same access as root. */ |
50 | if (capable(CAP_NET_ADMIN)) { |
51 | int mode = (table->mode >> 6) & 7; |
52 | return (mode << 6) | (mode << 3) | mode; |
53 | } |
54 | return table->mode; |
55 | } |
56 | |
57 | static struct ctl_table_root net_sysctl_root = { |
58 | .lookup = net_ctl_header_lookup, |
59 | .permissions = net_ctl_permissions, |
60 | }; |
61 | |
62 | static int net_ctl_ro_header_perms(struct ctl_table_root *root, |
63 | struct nsproxy *namespaces, struct ctl_table *table) |
64 | { |
65 | if (net_eq(namespaces->net_ns, &init_net)) |
66 | return table->mode; |
67 | else |
68 | return table->mode & ~0222; |
69 | } |
70 | |
71 | static struct ctl_table_root net_sysctl_ro_root = { |
72 | .permissions = net_ctl_ro_header_perms, |
73 | }; |
74 | |
75 | static int __net_init sysctl_net_init(struct net *net) |
76 | { |
77 | setup_sysctl_set(&net->sysctls, |
78 | &net_sysctl_ro_root.default_set, |
79 | is_seen); |
80 | return 0; |
81 | } |
82 | |
83 | static void __net_exit sysctl_net_exit(struct net *net) |
84 | { |
85 | WARN_ON(!list_empty(&net->sysctls.list)); |
86 | } |
87 | |
88 | static struct pernet_operations sysctl_pernet_ops = { |
89 | .init = sysctl_net_init, |
90 | .exit = sysctl_net_exit, |
91 | }; |
92 | |
93 | static __init int sysctl_init(void) |
94 | { |
95 | int ret; |
96 | ret = register_pernet_subsys(&sysctl_pernet_ops); |
97 | if (ret) |
98 | goto out; |
99 | register_sysctl_root(&net_sysctl_root); |
100 | setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL); |
101 | register_sysctl_root(&net_sysctl_ro_root); |
102 | out: |
103 | return ret; |
104 | } |
105 | subsys_initcall(sysctl_init); |
106 | |
107 | struct ctl_table_header *register_net_sysctl_table(struct net *net, |
108 | const struct ctl_path *path, struct ctl_table *table) |
109 | { |
110 | struct nsproxy namespaces; |
111 | namespaces = *current->nsproxy; |
112 | namespaces.net_ns = net; |
113 | return __register_sysctl_paths(&net_sysctl_root, |
114 | &namespaces, path, table); |
115 | } |
116 | EXPORT_SYMBOL_GPL(register_net_sysctl_table); |
117 | |
118 | struct ctl_table_header *register_net_sysctl_rotable(const |
119 | struct ctl_path *path, struct ctl_table *table) |
120 | { |
121 | return __register_sysctl_paths(&net_sysctl_ro_root, |
122 | &init_nsproxy, path, table); |
123 | } |
124 | EXPORT_SYMBOL_GPL(register_net_sysctl_rotable); |
125 | |
126 | void unregister_net_sysctl_table(struct ctl_table_header *header) |
127 | { |
128 | unregister_sysctl_table(header); |
129 | } |
130 | EXPORT_SYMBOL_GPL(unregister_net_sysctl_table); |
131 |
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