Commit | Line | Data |
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1da177e4 LT |
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 | * | |
1da177e4 LT |
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 | ||
1da177e4 LT |
14 | #include <linux/mm.h> |
15 | #include <linux/sysctl.h> | |
95bdfccb | 16 | #include <linux/nsproxy.h> |
1da177e4 | 17 | |
496a22b0 RK |
18 | #include <net/sock.h> |
19 | ||
1da177e4 | 20 | #ifdef CONFIG_INET |
20380731 | 21 | #include <net/ip.h> |
1da177e4 LT |
22 | #endif |
23 | ||
1da177e4 | 24 | #ifdef CONFIG_NET |
20380731 | 25 | #include <linux/if_ether.h> |
1da177e4 LT |
26 | #endif |
27 | ||
28 | #ifdef CONFIG_TR | |
20380731 | 29 | #include <linux/if_tr.h> |
1da177e4 LT |
30 | #endif |
31 | ||
73455092 | 32 | static struct ctl_table_set * |
95bdfccb EB |
33 | net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces) |
34 | { | |
73455092 AV |
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; | |
95bdfccb EB |
41 | } |
42 | ||
4ecb9009 SH |
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 | ||
95bdfccb EB |
56 | static struct ctl_table_root net_sysctl_root = { |
57 | .lookup = net_ctl_header_lookup, | |
4ecb9009 | 58 | .permissions = net_ctl_permissions, |
95bdfccb EB |
59 | }; |
60 | ||
d62c612e PE |
61 | static int net_ctl_ro_header_perms(struct ctl_table_root *root, |
62 | struct nsproxy *namespaces, struct ctl_table *table) | |
63 | { | |
64 | if (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 = { | |
d62c612e PE |
71 | .permissions = net_ctl_ro_header_perms, |
72 | }; | |
73 | ||
95bdfccb EB |
74 | static int sysctl_net_init(struct net *net) |
75 | { | |
eeb61f71 AV |
76 | setup_sysctl_set(&net->sysctls, |
77 | &net_sysctl_ro_root.default_set, | |
78 | is_seen); | |
95bdfccb EB |
79 | return 0; |
80 | } | |
81 | ||
82 | static void sysctl_net_exit(struct net *net) | |
83 | { | |
73455092 | 84 | WARN_ON(!list_empty(&net->sysctls.list)); |
95bdfccb EB |
85 | return; |
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); | |
73455092 | 100 | setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL); |
d62c612e | 101 | register_sysctl_root(&net_sysctl_ro_root); |
95bdfccb EB |
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 | ||
d62c612e PE |
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 | ||
95bdfccb EB |
126 | void unregister_net_sysctl_table(struct ctl_table_header *header) |
127 | { | |
ab59859d | 128 | unregister_sysctl_table(header); |
95bdfccb EB |
129 | } |
130 | EXPORT_SYMBOL_GPL(unregister_net_sysctl_table); |