Commit | Line | Data |
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3c12afe7 DM |
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> | |
3c12afe7 DM |
21 | #include <linux/mount.h> |
22 | #include <linux/nsproxy.h> | |
23 | #include <net/net_namespace.h> | |
e372c414 | 24 | #include <linux/seq_file.h> |
3c12afe7 DM |
25 | |
26 | #include "internal.h" | |
27 | ||
28 | ||
8086cd45 AB |
29 | static struct net *get_proc_net(const struct inode *inode) |
30 | { | |
31 | return maybe_get_net(PDE_NET(PDE(inode))); | |
32 | } | |
33 | ||
e372c414 DL |
34 | int seq_open_net(struct inode *ino, struct file *f, |
35 | const struct seq_operations *ops, int size) | |
36 | { | |
37 | struct net *net; | |
38 | struct seq_net_private *p; | |
39 | ||
40 | BUG_ON(size < sizeof(*p)); | |
41 | ||
42 | net = get_proc_net(ino); | |
43 | if (net == NULL) | |
44 | return -ENXIO; | |
45 | ||
46 | p = __seq_open_private(f, ops, size); | |
47 | if (p == NULL) { | |
48 | put_net(net); | |
49 | return -ENOMEM; | |
50 | } | |
1218854a | 51 | #ifdef CONFIG_NET_NS |
e372c414 | 52 | p->net = net; |
1218854a | 53 | #endif |
e372c414 DL |
54 | return 0; |
55 | } | |
56 | EXPORT_SYMBOL_GPL(seq_open_net); | |
57 | ||
de05c557 PE |
58 | int single_open_net(struct inode *inode, struct file *file, |
59 | int (*show)(struct seq_file *, void *)) | |
60 | { | |
61 | int err; | |
62 | struct net *net; | |
63 | ||
64 | err = -ENXIO; | |
65 | net = get_proc_net(inode); | |
66 | if (net == NULL) | |
67 | goto err_net; | |
68 | ||
69 | err = single_open(file, show, net); | |
70 | if (err < 0) | |
71 | goto err_open; | |
72 | ||
73 | return 0; | |
74 | ||
75 | err_open: | |
76 | put_net(net); | |
77 | err_net: | |
78 | return err; | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(single_open_net); | |
81 | ||
e372c414 DL |
82 | int seq_release_net(struct inode *ino, struct file *f) |
83 | { | |
84 | struct seq_file *seq; | |
e372c414 DL |
85 | |
86 | seq = f->private_data; | |
e372c414 | 87 | |
1218854a | 88 | put_net(seq_file_net(seq)); |
e372c414 DL |
89 | seq_release_private(ino, f); |
90 | return 0; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(seq_release_net); | |
93 | ||
b6fcbdb4 PE |
94 | int single_release_net(struct inode *ino, struct file *f) |
95 | { | |
96 | struct seq_file *seq = f->private_data; | |
97 | put_net(seq->private); | |
98 | return single_release(ino, f); | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(single_release_net); | |
101 | ||
e9720acd PE |
102 | static struct net *get_proc_task_net(struct inode *dir) |
103 | { | |
104 | struct task_struct *task; | |
105 | struct nsproxy *ns; | |
106 | struct net *net = NULL; | |
107 | ||
108 | rcu_read_lock(); | |
109 | task = pid_task(proc_pid(dir), PIDTYPE_PID); | |
110 | if (task != NULL) { | |
111 | ns = task_nsproxy(task); | |
112 | if (ns != NULL) | |
113 | net = get_net(ns->net_ns); | |
114 | } | |
115 | rcu_read_unlock(); | |
116 | ||
117 | return net; | |
118 | } | |
119 | ||
120 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
121 | struct dentry *dentry, struct nameidata *nd) | |
122 | { | |
123 | struct dentry *de; | |
124 | struct net *net; | |
125 | ||
126 | de = ERR_PTR(-ENOENT); | |
127 | net = get_proc_task_net(dir); | |
128 | if (net != NULL) { | |
129 | de = proc_lookup_de(net->proc_net, dir, dentry); | |
130 | put_net(net); | |
131 | } | |
132 | return de; | |
133 | } | |
134 | ||
135 | static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
136 | struct kstat *stat) | |
137 | { | |
138 | struct inode *inode = dentry->d_inode; | |
139 | struct net *net; | |
140 | ||
141 | net = get_proc_task_net(inode); | |
142 | ||
143 | generic_fillattr(inode, stat); | |
144 | ||
145 | if (net != NULL) { | |
146 | stat->nlink = net->proc_net->nlink; | |
147 | put_net(net); | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | const struct inode_operations proc_net_inode_operations = { | |
154 | .lookup = proc_tgid_net_lookup, | |
155 | .getattr = proc_tgid_net_getattr, | |
156 | }; | |
157 | ||
158 | static int proc_tgid_net_readdir(struct file *filp, void *dirent, | |
159 | filldir_t filldir) | |
160 | { | |
161 | int ret; | |
162 | struct net *net; | |
163 | ||
164 | ret = -EINVAL; | |
165 | net = get_proc_task_net(filp->f_path.dentry->d_inode); | |
166 | if (net != NULL) { | |
167 | ret = proc_readdir_de(net->proc_net, filp, dirent, filldir); | |
168 | put_net(net); | |
169 | } | |
170 | return ret; | |
171 | } | |
172 | ||
173 | const struct file_operations proc_net_operations = { | |
b4df2b92 | 174 | .llseek = generic_file_llseek, |
e9720acd PE |
175 | .read = generic_read_dir, |
176 | .readdir = proc_tgid_net_readdir, | |
177 | }; | |
178 | ||
e372c414 | 179 | |
3c12afe7 DM |
180 | struct proc_dir_entry *proc_net_fops_create(struct net *net, |
181 | const char *name, mode_t mode, const struct file_operations *fops) | |
182 | { | |
2d3a4e36 | 183 | return proc_create(name, mode, net->proc_net, fops); |
3c12afe7 | 184 | } |
36ac3135 | 185 | EXPORT_SYMBOL_GPL(proc_net_fops_create); |
3c12afe7 DM |
186 | |
187 | void proc_net_remove(struct net *net, const char *name) | |
188 | { | |
189 | remove_proc_entry(name, net->proc_net); | |
190 | } | |
36ac3135 | 191 | EXPORT_SYMBOL_GPL(proc_net_remove); |
3c12afe7 | 192 | |
4665079c | 193 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 194 | { |
e9720acd | 195 | struct proc_dir_entry *netd, *net_statd; |
3c12afe7 DM |
196 | int err; |
197 | ||
198 | err = -ENOMEM; | |
e9720acd PE |
199 | netd = kzalloc(sizeof(*netd), GFP_KERNEL); |
200 | if (!netd) | |
3c12afe7 DM |
201 | goto out; |
202 | ||
e9720acd PE |
203 | netd->data = net; |
204 | netd->nlink = 2; | |
205 | netd->name = "net"; | |
206 | netd->namelen = 3; | |
207 | netd->parent = &proc_root; | |
3c12afe7 DM |
208 | |
209 | err = -EEXIST; | |
e5d69b9f | 210 | net_statd = proc_net_mkdir(net, "stat", netd); |
3c12afe7 DM |
211 | if (!net_statd) |
212 | goto free_net; | |
213 | ||
3c12afe7 DM |
214 | net->proc_net = netd; |
215 | net->proc_net_stat = net_statd; | |
e9720acd | 216 | return 0; |
3c12afe7 | 217 | |
e9720acd PE |
218 | free_net: |
219 | kfree(netd); | |
3c12afe7 DM |
220 | out: |
221 | return err; | |
3c12afe7 DM |
222 | } |
223 | ||
4665079c | 224 | static __net_exit void proc_net_ns_exit(struct net *net) |
3c12afe7 DM |
225 | { |
226 | remove_proc_entry("stat", net->proc_net); | |
e9720acd | 227 | kfree(net->proc_net); |
3c12afe7 DM |
228 | } |
229 | ||
022cbae6 | 230 | static struct pernet_operations __net_initdata proc_net_ns_ops = { |
3c12afe7 DM |
231 | .init = proc_net_ns_init, |
232 | .exit = proc_net_ns_exit, | |
233 | }; | |
234 | ||
4665079c | 235 | int __init proc_net_init(void) |
3c12afe7 | 236 | { |
e9720acd | 237 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
238 | |
239 | return register_pernet_subsys(&proc_net_ns_ops); | |
240 | } |