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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); |