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 | ||
e9720acd PE |
90 | static struct net *get_proc_task_net(struct inode *dir) |
91 | { | |
92 | struct task_struct *task; | |
93 | struct nsproxy *ns; | |
94 | struct net *net = NULL; | |
95 | ||
96 | rcu_read_lock(); | |
97 | task = pid_task(proc_pid(dir), PIDTYPE_PID); | |
98 | if (task != NULL) { | |
99 | ns = task_nsproxy(task); | |
100 | if (ns != NULL) | |
101 | net = get_net(ns->net_ns); | |
102 | } | |
103 | rcu_read_unlock(); | |
104 | ||
105 | return net; | |
106 | } | |
107 | ||
108 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
109 | struct dentry *dentry, struct nameidata *nd) | |
110 | { | |
111 | struct dentry *de; | |
112 | struct net *net; | |
113 | ||
114 | de = ERR_PTR(-ENOENT); | |
115 | net = get_proc_task_net(dir); | |
116 | if (net != NULL) { | |
117 | de = proc_lookup_de(net->proc_net, dir, dentry); | |
118 | put_net(net); | |
119 | } | |
120 | return de; | |
121 | } | |
122 | ||
123 | static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
124 | struct kstat *stat) | |
125 | { | |
126 | struct inode *inode = dentry->d_inode; | |
127 | struct net *net; | |
128 | ||
129 | net = get_proc_task_net(inode); | |
130 | ||
131 | generic_fillattr(inode, stat); | |
132 | ||
133 | if (net != NULL) { | |
134 | stat->nlink = net->proc_net->nlink; | |
135 | put_net(net); | |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | const struct inode_operations proc_net_inode_operations = { | |
142 | .lookup = proc_tgid_net_lookup, | |
143 | .getattr = proc_tgid_net_getattr, | |
144 | }; | |
145 | ||
146 | static int proc_tgid_net_readdir(struct file *filp, void *dirent, | |
147 | filldir_t filldir) | |
148 | { | |
149 | int ret; | |
150 | struct net *net; | |
151 | ||
152 | ret = -EINVAL; | |
153 | net = get_proc_task_net(filp->f_path.dentry->d_inode); | |
154 | if (net != NULL) { | |
155 | ret = proc_readdir_de(net->proc_net, filp, dirent, filldir); | |
156 | put_net(net); | |
157 | } | |
158 | return ret; | |
159 | } | |
160 | ||
161 | const struct file_operations proc_net_operations = { | |
162 | .read = generic_read_dir, | |
163 | .readdir = proc_tgid_net_readdir, | |
164 | }; | |
165 | ||
e372c414 | 166 | |
3c12afe7 DM |
167 | struct proc_dir_entry *proc_net_fops_create(struct net *net, |
168 | const char *name, mode_t mode, const struct file_operations *fops) | |
169 | { | |
2d3a4e36 | 170 | return proc_create(name, mode, net->proc_net, fops); |
3c12afe7 | 171 | } |
36ac3135 | 172 | EXPORT_SYMBOL_GPL(proc_net_fops_create); |
3c12afe7 DM |
173 | |
174 | void proc_net_remove(struct net *net, const char *name) | |
175 | { | |
176 | remove_proc_entry(name, net->proc_net); | |
177 | } | |
36ac3135 | 178 | EXPORT_SYMBOL_GPL(proc_net_remove); |
3c12afe7 | 179 | |
077130c0 EB |
180 | struct net *get_proc_net(const struct inode *inode) |
181 | { | |
182 | return maybe_get_net(PDE_NET(PDE(inode))); | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(get_proc_net); | |
185 | ||
4665079c | 186 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 187 | { |
e9720acd | 188 | struct proc_dir_entry *netd, *net_statd; |
3c12afe7 DM |
189 | int err; |
190 | ||
191 | err = -ENOMEM; | |
e9720acd PE |
192 | netd = kzalloc(sizeof(*netd), GFP_KERNEL); |
193 | if (!netd) | |
3c12afe7 DM |
194 | goto out; |
195 | ||
e9720acd PE |
196 | netd->data = net; |
197 | netd->nlink = 2; | |
198 | netd->name = "net"; | |
199 | netd->namelen = 3; | |
200 | netd->parent = &proc_root; | |
3c12afe7 DM |
201 | |
202 | err = -EEXIST; | |
e5d69b9f | 203 | net_statd = proc_net_mkdir(net, "stat", netd); |
3c12afe7 DM |
204 | if (!net_statd) |
205 | goto free_net; | |
206 | ||
3c12afe7 DM |
207 | net->proc_net = netd; |
208 | net->proc_net_stat = net_statd; | |
e9720acd | 209 | return 0; |
3c12afe7 | 210 | |
e9720acd PE |
211 | free_net: |
212 | kfree(netd); | |
3c12afe7 DM |
213 | out: |
214 | return err; | |
3c12afe7 DM |
215 | } |
216 | ||
4665079c | 217 | static __net_exit void proc_net_ns_exit(struct net *net) |
3c12afe7 DM |
218 | { |
219 | remove_proc_entry("stat", net->proc_net); | |
e9720acd | 220 | kfree(net->proc_net); |
3c12afe7 DM |
221 | } |
222 | ||
022cbae6 | 223 | static struct pernet_operations __net_initdata proc_net_ns_ops = { |
3c12afe7 DM |
224 | .init = proc_net_ns_init, |
225 | .exit = proc_net_ns_exit, | |
226 | }; | |
227 | ||
4665079c | 228 | int __init proc_net_init(void) |
3c12afe7 | 229 | { |
e9720acd | 230 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
231 | |
232 | return register_pernet_subsys(&proc_net_ns_ops); | |
233 | } |