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Source at commit 6c17a31f1fc515425221067cb3ece599c09dbc5d created 12 years 8 months ago. By Werner Almesberger, atusb, atben: moved from spi/ to ieee802154/; renamed atusb to spi_atusb | |
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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/sysctl.h> |
16 | #include <linux/nsproxy.h> |
17 | |
18 | #include <net/sock.h> |
19 | |
20 | #ifdef CONFIG_INET |
21 | #include <net/ip.h> |
22 | #endif |
23 | |
24 | #ifdef CONFIG_NET |
25 | #include <linux/if_ether.h> |
26 | #endif |
27 | |
28 | #ifdef CONFIG_TR |
29 | #include <linux/if_tr.h> |
30 | #endif |
31 | |
32 | static struct ctl_table_set * |
33 | net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces) |
34 | { |
35 | return &namespaces->net_ns->sysctls; |
36 | } |
37 | |
38 | static int is_seen(struct ctl_table_set *set) |
39 | { |
40 | return ¤t->nsproxy->net_ns->sysctls == set; |
41 | } |
42 | |
43 | /* Return standard mode bits for table entry. */ |
44 | static int net_ctl_permissions(struct ctl_table_root *root, |
45 | struct nsproxy *nsproxy, |
46 | struct ctl_table *table) |
47 | { |
48 | /* Allow network administrator to have same access as root. */ |
49 | if (capable(CAP_NET_ADMIN)) { |
50 | int mode = (table->mode >> 6) & 7; |
51 | return (mode << 6) | (mode << 3) | mode; |
52 | } |
53 | return table->mode; |
54 | } |
55 | |
56 | static struct ctl_table_root net_sysctl_root = { |
57 | .lookup = net_ctl_header_lookup, |
58 | .permissions = net_ctl_permissions, |
59 | }; |
60 | |
61 | static int net_ctl_ro_header_perms(struct ctl_table_root *root, |
62 | struct nsproxy *namespaces, struct ctl_table *table) |
63 | { |
64 | if (net_eq(namespaces->net_ns, &init_net)) |
65 | return table->mode; |
66 | else |
67 | return table->mode & ~0222; |
68 | } |
69 | |
70 | static struct ctl_table_root net_sysctl_ro_root = { |
71 | .permissions = net_ctl_ro_header_perms, |
72 | }; |
73 | |
74 | static int __net_init sysctl_net_init(struct net *net) |
75 | { |
76 | setup_sysctl_set(&net->sysctls, |
77 | &net_sysctl_ro_root.default_set, |
78 | is_seen); |
79 | return 0; |
80 | } |
81 | |
82 | static void __net_exit sysctl_net_exit(struct net *net) |
83 | { |
84 | WARN_ON(!list_empty(&net->sysctls.list)); |
85 | } |
86 | |
87 | static struct pernet_operations sysctl_pernet_ops = { |
88 | .init = sysctl_net_init, |
89 | .exit = sysctl_net_exit, |
90 | }; |
91 | |
92 | static __init int sysctl_init(void) |
93 | { |
94 | int ret; |
95 | ret = register_pernet_subsys(&sysctl_pernet_ops); |
96 | if (ret) |
97 | goto out; |
98 | register_sysctl_root(&net_sysctl_root); |
99 | setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL); |
100 | register_sysctl_root(&net_sysctl_ro_root); |
101 | out: |
102 | return ret; |
103 | } |
104 | subsys_initcall(sysctl_init); |
105 | |
106 | struct ctl_table_header *register_net_sysctl_table(struct net *net, |
107 | const struct ctl_path *path, struct ctl_table *table) |
108 | { |
109 | struct nsproxy namespaces; |
110 | namespaces = *current->nsproxy; |
111 | namespaces.net_ns = net; |
112 | return __register_sysctl_paths(&net_sysctl_root, |
113 | &namespaces, path, table); |
114 | } |
115 | EXPORT_SYMBOL_GPL(register_net_sysctl_table); |
116 | |
117 | struct ctl_table_header *register_net_sysctl_rotable(const |
118 | struct ctl_path *path, struct ctl_table *table) |
119 | { |
120 | return __register_sysctl_paths(&net_sysctl_ro_root, |
121 | &init_nsproxy, path, table); |
122 | } |
123 | EXPORT_SYMBOL_GPL(register_net_sysctl_rotable); |
124 | |
125 | void unregister_net_sysctl_table(struct ctl_table_header *header) |
126 | { |
127 | unregister_sysctl_table(header); |
128 | } |
129 | EXPORT_SYMBOL_GPL(unregister_net_sysctl_table); |
130 |
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