blob: 83f357b30d71c583e4662784e53639b5391cf84e [file] [log] [blame]
David S. Miller3c12afe2007-09-12 14:18:18 +02001/*
2 * linux/fs/proc/net.c
3 *
4 * Copyright (C) 2007
5 *
6 * Author: Eric Biederman <ebiederm@xmission.com>
7 *
8 * proc net directory handling functions
9 */
10
11#include <asm/uaccess.h>
12
13#include <linux/errno.h>
14#include <linux/time.h>
15#include <linux/proc_fs.h>
16#include <linux/stat.h>
17#include <linux/init.h>
18#include <linux/sched.h>
19#include <linux/module.h>
20#include <linux/bitops.h>
21#include <linux/smp_lock.h>
22#include <linux/mount.h>
23#include <linux/nsproxy.h>
24#include <net/net_namespace.h>
Denis V. Luneve372c412007-11-19 22:31:54 -080025#include <linux/seq_file.h>
David S. Miller3c12afe2007-09-12 14:18:18 +020026
27#include "internal.h"
28
29
Denis V. Luneve372c412007-11-19 22:31:54 -080030int seq_open_net(struct inode *ino, struct file *f,
31 const struct seq_operations *ops, int size)
32{
33 struct net *net;
34 struct seq_net_private *p;
35
36 BUG_ON(size < sizeof(*p));
37
38 net = get_proc_net(ino);
39 if (net == NULL)
40 return -ENXIO;
41
42 p = __seq_open_private(f, ops, size);
43 if (p == NULL) {
44 put_net(net);
45 return -ENOMEM;
46 }
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +090047#ifdef CONFIG_NET_NS
Denis V. Luneve372c412007-11-19 22:31:54 -080048 p->net = net;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +090049#endif
Denis V. Luneve372c412007-11-19 22:31:54 -080050 return 0;
51}
52EXPORT_SYMBOL_GPL(seq_open_net);
53
54int seq_release_net(struct inode *ino, struct file *f)
55{
56 struct seq_file *seq;
Denis V. Luneve372c412007-11-19 22:31:54 -080057
58 seq = f->private_data;
Denis V. Luneve372c412007-11-19 22:31:54 -080059
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +090060 put_net(seq_file_net(seq));
Denis V. Luneve372c412007-11-19 22:31:54 -080061 seq_release_private(ino, f);
62 return 0;
63}
64EXPORT_SYMBOL_GPL(seq_release_net);
65
Pavel Emelyanove9720ac2008-03-07 11:08:40 -080066static struct net *get_proc_task_net(struct inode *dir)
67{
68 struct task_struct *task;
69 struct nsproxy *ns;
70 struct net *net = NULL;
71
72 rcu_read_lock();
73 task = pid_task(proc_pid(dir), PIDTYPE_PID);
74 if (task != NULL) {
75 ns = task_nsproxy(task);
76 if (ns != NULL)
77 net = get_net(ns->net_ns);
78 }
79 rcu_read_unlock();
80
81 return net;
82}
83
84static struct dentry *proc_tgid_net_lookup(struct inode *dir,
85 struct dentry *dentry, struct nameidata *nd)
86{
87 struct dentry *de;
88 struct net *net;
89
90 de = ERR_PTR(-ENOENT);
91 net = get_proc_task_net(dir);
92 if (net != NULL) {
93 de = proc_lookup_de(net->proc_net, dir, dentry);
94 put_net(net);
95 }
96 return de;
97}
98
99static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
100 struct kstat *stat)
101{
102 struct inode *inode = dentry->d_inode;
103 struct net *net;
104
105 net = get_proc_task_net(inode);
106
107 generic_fillattr(inode, stat);
108
109 if (net != NULL) {
110 stat->nlink = net->proc_net->nlink;
111 put_net(net);
112 }
113
114 return 0;
115}
116
117const struct inode_operations proc_net_inode_operations = {
118 .lookup = proc_tgid_net_lookup,
119 .getattr = proc_tgid_net_getattr,
120};
121
122static int proc_tgid_net_readdir(struct file *filp, void *dirent,
123 filldir_t filldir)
124{
125 int ret;
126 struct net *net;
127
128 ret = -EINVAL;
129 net = get_proc_task_net(filp->f_path.dentry->d_inode);
130 if (net != NULL) {
131 ret = proc_readdir_de(net->proc_net, filp, dirent, filldir);
132 put_net(net);
133 }
134 return ret;
135}
136
137const struct file_operations proc_net_operations = {
138 .read = generic_read_dir,
139 .readdir = proc_tgid_net_readdir,
140};
141
Denis V. Luneve372c412007-11-19 22:31:54 -0800142
David S. Miller3c12afe2007-09-12 14:18:18 +0200143struct proc_dir_entry *proc_net_fops_create(struct net *net,
144 const char *name, mode_t mode, const struct file_operations *fops)
145{
Alexey Dobriyan2d3a4e32008-02-08 04:18:37 -0800146 return proc_create(name, mode, net->proc_net, fops);
David S. Miller3c12afe2007-09-12 14:18:18 +0200147}
Daniel Lezcano36ac3132007-09-12 14:51:47 +0200148EXPORT_SYMBOL_GPL(proc_net_fops_create);
David S. Miller3c12afe2007-09-12 14:18:18 +0200149
150void proc_net_remove(struct net *net, const char *name)
151{
152 remove_proc_entry(name, net->proc_net);
153}
Daniel Lezcano36ac3132007-09-12 14:51:47 +0200154EXPORT_SYMBOL_GPL(proc_net_remove);
David S. Miller3c12afe2007-09-12 14:18:18 +0200155
Eric W. Biederman077130c2007-09-13 09:18:57 +0200156struct net *get_proc_net(const struct inode *inode)
157{
158 return maybe_get_net(PDE_NET(PDE(inode)));
159}
160EXPORT_SYMBOL_GPL(get_proc_net);
161
Pavel Emelyanov46650792007-10-08 20:38:39 -0700162static __net_init int proc_net_ns_init(struct net *net)
David S. Miller3c12afe2007-09-12 14:18:18 +0200163{
Pavel Emelyanove9720ac2008-03-07 11:08:40 -0800164 struct proc_dir_entry *netd, *net_statd;
David S. Miller3c12afe2007-09-12 14:18:18 +0200165 int err;
166
167 err = -ENOMEM;
Pavel Emelyanove9720ac2008-03-07 11:08:40 -0800168 netd = kzalloc(sizeof(*netd), GFP_KERNEL);
169 if (!netd)
David S. Miller3c12afe2007-09-12 14:18:18 +0200170 goto out;
171
Pavel Emelyanove9720ac2008-03-07 11:08:40 -0800172 netd->data = net;
173 netd->nlink = 2;
174 netd->name = "net";
175 netd->namelen = 3;
176 netd->parent = &proc_root;
David S. Miller3c12afe2007-09-12 14:18:18 +0200177
178 err = -EEXIST;
Denis V. Luneve5d69b92008-01-10 03:51:41 -0800179 net_statd = proc_net_mkdir(net, "stat", netd);
David S. Miller3c12afe2007-09-12 14:18:18 +0200180 if (!net_statd)
181 goto free_net;
182
David S. Miller3c12afe2007-09-12 14:18:18 +0200183 net->proc_net = netd;
184 net->proc_net_stat = net_statd;
Pavel Emelyanove9720ac2008-03-07 11:08:40 -0800185 return 0;
David S. Miller3c12afe2007-09-12 14:18:18 +0200186
Pavel Emelyanove9720ac2008-03-07 11:08:40 -0800187free_net:
188 kfree(netd);
David S. Miller3c12afe2007-09-12 14:18:18 +0200189out:
190 return err;
David S. Miller3c12afe2007-09-12 14:18:18 +0200191}
192
Pavel Emelyanov46650792007-10-08 20:38:39 -0700193static __net_exit void proc_net_ns_exit(struct net *net)
David S. Miller3c12afe2007-09-12 14:18:18 +0200194{
195 remove_proc_entry("stat", net->proc_net);
Pavel Emelyanove9720ac2008-03-07 11:08:40 -0800196 kfree(net->proc_net);
David S. Miller3c12afe2007-09-12 14:18:18 +0200197}
198
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800199static struct pernet_operations __net_initdata proc_net_ns_ops = {
David S. Miller3c12afe2007-09-12 14:18:18 +0200200 .init = proc_net_ns_init,
201 .exit = proc_net_ns_exit,
202};
203
Pavel Emelyanov46650792007-10-08 20:38:39 -0700204int __init proc_net_init(void)
David S. Miller3c12afe2007-09-12 14:18:18 +0200205{
Pavel Emelyanove9720ac2008-03-07 11:08:40 -0800206 proc_symlink("net", NULL, "self/net");
David S. Miller3c12afe2007-09-12 14:18:18 +0200207
208 return register_pernet_subsys(&proc_net_ns_ops);
209}