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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> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/mount.h> | |
23 | #include <linux/nsproxy.h> | |
24 | #include <net/net_namespace.h> | |
e372c414 | 25 | #include <linux/seq_file.h> |
3c12afe7 DM |
26 | |
27 | #include "internal.h" | |
28 | ||
29 | ||
e372c414 DL |
30 | int 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 | } | |
1218854a | 47 | #ifdef CONFIG_NET_NS |
e372c414 | 48 | p->net = net; |
1218854a | 49 | #endif |
e372c414 DL |
50 | return 0; |
51 | } | |
52 | EXPORT_SYMBOL_GPL(seq_open_net); | |
53 | ||
de05c557 PE |
54 | int single_open_net(struct inode *inode, struct file *file, |
55 | int (*show)(struct seq_file *, void *)) | |
56 | { | |
57 | int err; | |
58 | struct net *net; | |
59 | ||
60 | err = -ENXIO; | |
61 | net = get_proc_net(inode); | |
62 | if (net == NULL) | |
63 | goto err_net; | |
64 | ||
65 | err = single_open(file, show, net); | |
66 | if (err < 0) | |
67 | goto err_open; | |
68 | ||
69 | return 0; | |
70 | ||
71 | err_open: | |
72 | put_net(net); | |
73 | err_net: | |
74 | return err; | |
75 | } | |
76 | EXPORT_SYMBOL_GPL(single_open_net); | |
77 | ||
e372c414 DL |
78 | int seq_release_net(struct inode *ino, struct file *f) |
79 | { | |
80 | struct seq_file *seq; | |
e372c414 DL |
81 | |
82 | seq = f->private_data; | |
e372c414 | 83 | |
1218854a | 84 | put_net(seq_file_net(seq)); |
e372c414 DL |
85 | seq_release_private(ino, f); |
86 | return 0; | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(seq_release_net); | |
89 | ||
b6fcbdb4 PE |
90 | int single_release_net(struct inode *ino, struct file *f) |
91 | { | |
92 | struct seq_file *seq = f->private_data; | |
93 | put_net(seq->private); | |
94 | return single_release(ino, f); | |
95 | } | |
96 | EXPORT_SYMBOL_GPL(single_release_net); | |
97 | ||
e9720acd PE |
98 | static struct net *get_proc_task_net(struct inode *dir) |
99 | { | |
100 | struct task_struct *task; | |
101 | struct nsproxy *ns; | |
102 | struct net *net = NULL; | |
103 | ||
104 | rcu_read_lock(); | |
105 | task = pid_task(proc_pid(dir), PIDTYPE_PID); | |
106 | if (task != NULL) { | |
107 | ns = task_nsproxy(task); | |
108 | if (ns != NULL) | |
109 | net = get_net(ns->net_ns); | |
110 | } | |
111 | rcu_read_unlock(); | |
112 | ||
113 | return net; | |
114 | } | |
115 | ||
116 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
117 | struct dentry *dentry, struct nameidata *nd) | |
118 | { | |
119 | struct dentry *de; | |
120 | struct net *net; | |
121 | ||
122 | de = ERR_PTR(-ENOENT); | |
123 | net = get_proc_task_net(dir); | |
124 | if (net != NULL) { | |
125 | de = proc_lookup_de(net->proc_net, dir, dentry); | |
126 | put_net(net); | |
127 | } | |
128 | return de; | |
129 | } | |
130 | ||
131 | static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
132 | struct kstat *stat) | |
133 | { | |
134 | struct inode *inode = dentry->d_inode; | |
135 | struct net *net; | |
136 | ||
137 | net = get_proc_task_net(inode); | |
138 | ||
139 | generic_fillattr(inode, stat); | |
140 | ||
141 | if (net != NULL) { | |
142 | stat->nlink = net->proc_net->nlink; | |
143 | put_net(net); | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | const struct inode_operations proc_net_inode_operations = { | |
150 | .lookup = proc_tgid_net_lookup, | |
151 | .getattr = proc_tgid_net_getattr, | |
152 | }; | |
153 | ||
154 | static int proc_tgid_net_readdir(struct file *filp, void *dirent, | |
155 | filldir_t filldir) | |
156 | { | |
157 | int ret; | |
158 | struct net *net; | |
159 | ||
160 | ret = -EINVAL; | |
161 | net = get_proc_task_net(filp->f_path.dentry->d_inode); | |
162 | if (net != NULL) { | |
163 | ret = proc_readdir_de(net->proc_net, filp, dirent, filldir); | |
164 | put_net(net); | |
165 | } | |
166 | return ret; | |
167 | } | |
168 | ||
169 | const struct file_operations proc_net_operations = { | |
170 | .read = generic_read_dir, | |
171 | .readdir = proc_tgid_net_readdir, | |
172 | }; | |
173 | ||
e372c414 | 174 | |
3c12afe7 DM |
175 | struct proc_dir_entry *proc_net_fops_create(struct net *net, |
176 | const char *name, mode_t mode, const struct file_operations *fops) | |
177 | { | |
2d3a4e36 | 178 | return proc_create(name, mode, net->proc_net, fops); |
3c12afe7 | 179 | } |
36ac3135 | 180 | EXPORT_SYMBOL_GPL(proc_net_fops_create); |
3c12afe7 DM |
181 | |
182 | void proc_net_remove(struct net *net, const char *name) | |
183 | { | |
184 | remove_proc_entry(name, net->proc_net); | |
185 | } | |
36ac3135 | 186 | EXPORT_SYMBOL_GPL(proc_net_remove); |
3c12afe7 | 187 | |
077130c0 EB |
188 | struct net *get_proc_net(const struct inode *inode) |
189 | { | |
190 | return maybe_get_net(PDE_NET(PDE(inode))); | |
191 | } | |
192 | EXPORT_SYMBOL_GPL(get_proc_net); | |
193 | ||
4665079c | 194 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 195 | { |
e9720acd | 196 | struct proc_dir_entry *netd, *net_statd; |
3c12afe7 DM |
197 | int err; |
198 | ||
199 | err = -ENOMEM; | |
e9720acd PE |
200 | netd = kzalloc(sizeof(*netd), GFP_KERNEL); |
201 | if (!netd) | |
3c12afe7 DM |
202 | goto out; |
203 | ||
e9720acd PE |
204 | netd->data = net; |
205 | netd->nlink = 2; | |
206 | netd->name = "net"; | |
207 | netd->namelen = 3; | |
208 | netd->parent = &proc_root; | |
3c12afe7 DM |
209 | |
210 | err = -EEXIST; | |
e5d69b9f | 211 | net_statd = proc_net_mkdir(net, "stat", netd); |
3c12afe7 DM |
212 | if (!net_statd) |
213 | goto free_net; | |
214 | ||
3c12afe7 DM |
215 | net->proc_net = netd; |
216 | net->proc_net_stat = net_statd; | |
e9720acd | 217 | return 0; |
3c12afe7 | 218 | |
e9720acd PE |
219 | free_net: |
220 | kfree(netd); | |
3c12afe7 DM |
221 | out: |
222 | return err; | |
3c12afe7 DM |
223 | } |
224 | ||
4665079c | 225 | static __net_exit void proc_net_ns_exit(struct net *net) |
3c12afe7 DM |
226 | { |
227 | remove_proc_entry("stat", net->proc_net); | |
e9720acd | 228 | kfree(net->proc_net); |
3c12afe7 DM |
229 | } |
230 | ||
022cbae6 | 231 | static struct pernet_operations __net_initdata proc_net_ns_ops = { |
3c12afe7 DM |
232 | .init = proc_net_ns_init, |
233 | .exit = proc_net_ns_exit, | |
234 | }; | |
235 | ||
4665079c | 236 | int __init proc_net_init(void) |
3c12afe7 | 237 | { |
e9720acd | 238 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
239 | |
240 | return register_pernet_subsys(&proc_net_ns_ops); | |
241 | } |