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authorDavid S. Miller <davem@kimchee.(none)>2007-09-12 08:18:18 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 19:49:14 -0400
commit3c12afe75f61d9402797d63941367962ca36fcc9 (patch)
tree06a0dc5a84d2d77630ba5ff7e6ecc3902e61d721 /fs
parent678aa8e4eb1e5d78dfdb70934932c9c90e315f62 (diff)
[NET]: Fix missed addition of fs/proc/proc_net.c
My bad. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/proc_net.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
new file mode 100644
index 000000000000..45dde2f7034d
--- /dev/null
+++ b/fs/proc/proc_net.c
@@ -0,0 +1,192 @@
1/*
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>
25
26#include "internal.h"
27
28
29struct proc_dir_entry *proc_net_create(struct net *net,
30 const char *name, mode_t mode, get_info_t *get_info)
31{
32 return create_proc_info_entry(name,mode, net->proc_net, get_info);
33}
34
35struct proc_dir_entry *proc_net_fops_create(struct net *net,
36 const char *name, mode_t mode, const struct file_operations *fops)
37{
38 struct proc_dir_entry *res;
39
40 res = create_proc_entry(name, mode, net->proc_net);
41 if (res)
42 res->proc_fops = fops;
43 return res;
44}
45
46void proc_net_remove(struct net *net, const char *name)
47{
48 remove_proc_entry(name, net->proc_net);
49}
50
51
52static struct proc_dir_entry *proc_net_shadow;
53
54static struct dentry *proc_net_shadow_dentry(struct dentry *parent,
55 struct proc_dir_entry *de)
56{
57 struct dentry *shadow = NULL;
58 struct inode *inode;
59 if (!de)
60 goto out;
61 de_get(de);
62 inode = proc_get_inode(parent->d_inode->i_sb, de->low_ino, de);
63 if (!inode)
64 goto out_de_put;
65 shadow = d_alloc_name(parent, de->name);
66 if (!shadow)
67 goto out_iput;
68 shadow->d_op = parent->d_op; /* proc_dentry_operations */
69 d_instantiate(shadow, inode);
70out:
71 return shadow;
72out_iput:
73 iput(inode);
74out_de_put:
75 de_put(de);
76 goto out;
77}
78
79static void *proc_net_follow_link(struct dentry *parent, struct nameidata *nd)
80{
81 struct net *net = current->nsproxy->net_ns;
82 struct dentry *shadow;
83 shadow = proc_net_shadow_dentry(parent, net->proc_net);
84 if (!shadow)
85 return ERR_PTR(-ENOENT);
86
87 dput(nd->dentry);
88 /* My dentry count is 1 and that should be enough as the
89 * shadow dentry is thrown away immediately.
90 */
91 nd->dentry = shadow;
92 return NULL;
93}
94
95static struct dentry *proc_net_lookup(struct inode *dir, struct dentry *dentry,
96 struct nameidata *nd)
97{
98 struct net *net = current->nsproxy->net_ns;
99 struct dentry *shadow;
100
101 shadow = proc_net_shadow_dentry(nd->dentry, net->proc_net);
102 if (!shadow)
103 return ERR_PTR(-ENOENT);
104
105 dput(nd->dentry);
106 nd->dentry = shadow;
107
108 return shadow->d_inode->i_op->lookup(shadow->d_inode, dentry, nd);
109}
110
111static int proc_net_setattr(struct dentry *dentry, struct iattr *iattr)
112{
113 struct net *net = current->nsproxy->net_ns;
114 struct dentry *shadow;
115 int ret;
116
117 shadow = proc_net_shadow_dentry(dentry->d_parent, net->proc_net);
118 if (!shadow)
119 return -ENOENT;
120 ret = shadow->d_inode->i_op->setattr(shadow, iattr);
121 dput(shadow);
122 return ret;
123}
124
125static const struct file_operations proc_net_dir_operations = {
126 .read = generic_read_dir,
127};
128
129static struct inode_operations proc_net_dir_inode_operations = {
130 .follow_link = proc_net_follow_link,
131 .lookup = proc_net_lookup,
132 .setattr = proc_net_setattr,
133};
134
135static int proc_net_ns_init(struct net *net)
136{
137 struct proc_dir_entry *root, *netd, *net_statd;
138 int err;
139
140 err = -ENOMEM;
141 root = kzalloc(sizeof(*root), GFP_KERNEL);
142 if (!root)
143 goto out;
144
145 err = -EEXIST;
146 netd = proc_mkdir("net", root);
147 if (!netd)
148 goto free_root;
149
150 err = -EEXIST;
151 net_statd = proc_mkdir("stat", netd);
152 if (!net_statd)
153 goto free_net;
154
155 root->data = net;
156 netd->data = net;
157 net_statd->data = net;
158
159 net->proc_net_root = root;
160 net->proc_net = netd;
161 net->proc_net_stat = net_statd;
162 err = 0;
163
164out:
165 return err;
166free_net:
167 remove_proc_entry("net", root);
168free_root:
169 kfree(root);
170 goto out;
171}
172
173static void proc_net_ns_exit(struct net *net)
174{
175 remove_proc_entry("stat", net->proc_net);
176 remove_proc_entry("net", net->proc_net_root);
177 kfree(net->proc_net_root);
178}
179
180struct pernet_operations proc_net_ns_ops = {
181 .init = proc_net_ns_init,
182 .exit = proc_net_ns_exit,
183};
184
185int proc_net_init(void)
186{
187 proc_net_shadow = proc_mkdir("net", NULL);
188 proc_net_shadow->proc_iops = &proc_net_dir_inode_operations;
189 proc_net_shadow->proc_fops = &proc_net_dir_operations;
190
191 return register_pernet_subsys(&proc_net_ns_ops);
192}