Blame view

net/sysctl_net.c 3.01 KB
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1
2
3
4
5
6
  /* -*- linux-c -*-
   * sysctl_net.c: sysctl interface to net subsystem.
   *
   * Begun April 1, 1996, Mike Shaver.
   * Added /proc/sys/net directories for each protocol family. [MS]
   *
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
7
8
9
10
11
12
   * Revision 1.2  1996/05/08  20:24:40  shaver
   * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
   * NET_IPV4_IP_FORWARD.
   *
   *
   */
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
13
14
  #include <linux/mm.h>
  #include <linux/sysctl.h>
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
15
  #include <linux/nsproxy.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
16

496a22b08   Russell King   [NET]: Fix "sysct...
17
  #include <net/sock.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
18
  #ifdef CONFIG_INET
20380731b   Arnaldo Carvalho de Melo   [NET]: Fix sparse...
19
  #include <net/ip.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
20
  #endif
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
21
  #ifdef CONFIG_NET
20380731b   Arnaldo Carvalho de Melo   [NET]: Fix sparse...
22
  #include <linux/if_ether.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
23
24
25
  #endif
  
  #ifdef CONFIG_TR
20380731b   Arnaldo Carvalho de Melo   [NET]: Fix sparse...
26
  #include <linux/if_tr.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
27
  #endif
734550921   Al Viro   [PATCH] beginning...
28
  static struct ctl_table_set *
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
29
30
  net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
  {
734550921   Al Viro   [PATCH] beginning...
31
32
33
34
35
36
  	return &namespaces->net_ns->sysctls;
  }
  
  static int is_seen(struct ctl_table_set *set)
  {
  	return &current->nsproxy->net_ns->sysctls == set;
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
37
  }
4ecb90090   Stephen Hemminger   sysctl: allow ove...
38
39
40
41
42
43
44
45
46
47
48
49
  /* Return standard mode bits for table entry. */
  static int net_ctl_permissions(struct ctl_table_root *root,
  			       struct nsproxy *nsproxy,
  			       struct ctl_table *table)
  {
  	/* Allow network administrator to have same access as root. */
  	if (capable(CAP_NET_ADMIN)) {
  		int mode = (table->mode >> 6) & 7;
  		return (mode << 6) | (mode << 3) | mode;
  	}
  	return table->mode;
  }
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
50
51
  static struct ctl_table_root net_sysctl_root = {
  	.lookup = net_ctl_header_lookup,
4ecb90090   Stephen Hemminger   sysctl: allow ove...
52
  	.permissions = net_ctl_permissions,
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
53
  };
d62c612ef   Pavel Emelyanov   netns: Introduce ...
54
55
56
  static int net_ctl_ro_header_perms(struct ctl_table_root *root,
  		struct nsproxy *namespaces, struct ctl_table *table)
  {
81a1d3c31   Cyrill Gorcunov   net: sysctl_net -...
57
  	if (net_eq(namespaces->net_ns, &init_net))
d62c612ef   Pavel Emelyanov   netns: Introduce ...
58
59
60
61
62
63
  		return table->mode;
  	else
  		return table->mode & ~0222;
  }
  
  static struct ctl_table_root net_sysctl_ro_root = {
d62c612ef   Pavel Emelyanov   netns: Introduce ...
64
65
  	.permissions = net_ctl_ro_header_perms,
  };
2c8c1e729   Alexey Dobriyan   net: spread __net...
66
  static int __net_init sysctl_net_init(struct net *net)
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
67
  {
eeb61f719   Al Viro   missing bits of n...
68
69
70
  	setup_sysctl_set(&net->sysctls,
  			 &net_sysctl_ro_root.default_set,
  			 is_seen);
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
71
72
  	return 0;
  }
2c8c1e729   Alexey Dobriyan   net: spread __net...
73
  static void __net_exit sysctl_net_exit(struct net *net)
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
74
  {
734550921   Al Viro   [PATCH] beginning...
75
  	WARN_ON(!list_empty(&net->sysctls.list));
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
76
77
78
79
80
81
82
83
84
85
86
87
88
89
  }
  
  static struct pernet_operations sysctl_pernet_ops = {
  	.init = sysctl_net_init,
  	.exit = sysctl_net_exit,
  };
  
  static __init int sysctl_init(void)
  {
  	int ret;
  	ret = register_pernet_subsys(&sysctl_pernet_ops);
  	if (ret)
  		goto out;
  	register_sysctl_root(&net_sysctl_root);
734550921   Al Viro   [PATCH] beginning...
90
  	setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL);
d62c612ef   Pavel Emelyanov   netns: Introduce ...
91
  	register_sysctl_root(&net_sysctl_ro_root);
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
  out:
  	return ret;
  }
  subsys_initcall(sysctl_init);
  
  struct ctl_table_header *register_net_sysctl_table(struct net *net,
  	const struct ctl_path *path, struct ctl_table *table)
  {
  	struct nsproxy namespaces;
  	namespaces = *current->nsproxy;
  	namespaces.net_ns = net;
  	return __register_sysctl_paths(&net_sysctl_root,
  					&namespaces, path, table);
  }
  EXPORT_SYMBOL_GPL(register_net_sysctl_table);
d62c612ef   Pavel Emelyanov   netns: Introduce ...
107
108
109
110
111
112
113
  struct ctl_table_header *register_net_sysctl_rotable(const
  		struct ctl_path *path, struct ctl_table *table)
  {
  	return __register_sysctl_paths(&net_sysctl_ro_root,
  			&init_nsproxy, path, table);
  }
  EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
114
115
  void unregister_net_sysctl_table(struct ctl_table_header *header)
  {
ab59859de   Harvey Harrison   net: fix returnin...
116
  	unregister_sysctl_table(header);
95bdfccb2   Eric W. Biederman   [NET]: Implement ...
117
118
  }
  EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);