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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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
3c12afe7 DM |
18 | #include <linux/init.h> |
19 | #include <linux/sched.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/bitops.h> | |
3c12afe7 DM |
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 | ||
4abfd029 DH |
29 | static inline struct net *PDE_NET(struct proc_dir_entry *pde) |
30 | { | |
31 | return pde->parent->data; | |
32 | } | |
3c12afe7 | 33 | |
8086cd45 AB |
34 | static struct net *get_proc_net(const struct inode *inode) |
35 | { | |
36 | return maybe_get_net(PDE_NET(PDE(inode))); | |
37 | } | |
38 | ||
e372c414 DL |
39 | int seq_open_net(struct inode *ino, struct file *f, |
40 | const struct seq_operations *ops, int size) | |
41 | { | |
42 | struct net *net; | |
43 | struct seq_net_private *p; | |
44 | ||
45 | BUG_ON(size < sizeof(*p)); | |
46 | ||
47 | net = get_proc_net(ino); | |
48 | if (net == NULL) | |
49 | return -ENXIO; | |
50 | ||
51 | p = __seq_open_private(f, ops, size); | |
52 | if (p == NULL) { | |
53 | put_net(net); | |
54 | return -ENOMEM; | |
55 | } | |
1218854a | 56 | #ifdef CONFIG_NET_NS |
e372c414 | 57 | p->net = net; |
1218854a | 58 | #endif |
e372c414 DL |
59 | return 0; |
60 | } | |
61 | EXPORT_SYMBOL_GPL(seq_open_net); | |
62 | ||
de05c557 PE |
63 | int single_open_net(struct inode *inode, struct file *file, |
64 | int (*show)(struct seq_file *, void *)) | |
65 | { | |
66 | int err; | |
67 | struct net *net; | |
68 | ||
69 | err = -ENXIO; | |
70 | net = get_proc_net(inode); | |
71 | if (net == NULL) | |
72 | goto err_net; | |
73 | ||
74 | err = single_open(file, show, net); | |
75 | if (err < 0) | |
76 | goto err_open; | |
77 | ||
78 | return 0; | |
79 | ||
80 | err_open: | |
81 | put_net(net); | |
82 | err_net: | |
83 | return err; | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(single_open_net); | |
86 | ||
e372c414 DL |
87 | int seq_release_net(struct inode *ino, struct file *f) |
88 | { | |
89 | struct seq_file *seq; | |
e372c414 DL |
90 | |
91 | seq = f->private_data; | |
e372c414 | 92 | |
1218854a | 93 | put_net(seq_file_net(seq)); |
e372c414 DL |
94 | seq_release_private(ino, f); |
95 | return 0; | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(seq_release_net); | |
98 | ||
b6fcbdb4 PE |
99 | int single_release_net(struct inode *ino, struct file *f) |
100 | { | |
101 | struct seq_file *seq = f->private_data; | |
102 | put_net(seq->private); | |
103 | return single_release(ino, f); | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(single_release_net); | |
106 | ||
e9720acd PE |
107 | static struct net *get_proc_task_net(struct inode *dir) |
108 | { | |
109 | struct task_struct *task; | |
110 | struct nsproxy *ns; | |
111 | struct net *net = NULL; | |
112 | ||
113 | rcu_read_lock(); | |
114 | task = pid_task(proc_pid(dir), PIDTYPE_PID); | |
115 | if (task != NULL) { | |
728dba3a EB |
116 | task_lock(task); |
117 | ns = task->nsproxy; | |
e9720acd PE |
118 | if (ns != NULL) |
119 | net = get_net(ns->net_ns); | |
728dba3a | 120 | task_unlock(task); |
e9720acd PE |
121 | } |
122 | rcu_read_unlock(); | |
123 | ||
124 | return net; | |
125 | } | |
126 | ||
127 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
00cd8dd3 | 128 | struct dentry *dentry, unsigned int flags) |
e9720acd PE |
129 | { |
130 | struct dentry *de; | |
131 | struct net *net; | |
132 | ||
133 | de = ERR_PTR(-ENOENT); | |
134 | net = get_proc_task_net(dir); | |
135 | if (net != NULL) { | |
136 | de = proc_lookup_de(net->proc_net, dir, dentry); | |
137 | put_net(net); | |
138 | } | |
139 | return de; | |
140 | } | |
141 | ||
142 | static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
143 | struct kstat *stat) | |
144 | { | |
2b0143b5 | 145 | struct inode *inode = d_inode(dentry); |
e9720acd PE |
146 | struct net *net; |
147 | ||
148 | net = get_proc_task_net(inode); | |
149 | ||
150 | generic_fillattr(inode, stat); | |
151 | ||
152 | if (net != NULL) { | |
153 | stat->nlink = net->proc_net->nlink; | |
154 | put_net(net); | |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | const struct inode_operations proc_net_inode_operations = { | |
161 | .lookup = proc_tgid_net_lookup, | |
162 | .getattr = proc_tgid_net_getattr, | |
163 | }; | |
164 | ||
f0c3b509 | 165 | static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx) |
e9720acd PE |
166 | { |
167 | int ret; | |
168 | struct net *net; | |
169 | ||
170 | ret = -EINVAL; | |
f0c3b509 | 171 | net = get_proc_task_net(file_inode(file)); |
e9720acd | 172 | if (net != NULL) { |
f0c3b509 | 173 | ret = proc_readdir_de(net->proc_net, file, ctx); |
e9720acd PE |
174 | put_net(net); |
175 | } | |
176 | return ret; | |
177 | } | |
178 | ||
179 | const struct file_operations proc_net_operations = { | |
b4df2b92 | 180 | .llseek = generic_file_llseek, |
e9720acd | 181 | .read = generic_read_dir, |
f0c3b509 | 182 | .iterate = proc_tgid_net_readdir, |
e9720acd PE |
183 | }; |
184 | ||
4665079c | 185 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 186 | { |
e9720acd | 187 | struct proc_dir_entry *netd, *net_statd; |
3c12afe7 DM |
188 | int err; |
189 | ||
190 | err = -ENOMEM; | |
09570f91 | 191 | netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL); |
e9720acd | 192 | if (!netd) |
3c12afe7 DM |
193 | goto out; |
194 | ||
710585d4 | 195 | netd->subdir = RB_ROOT; |
e9720acd PE |
196 | netd->data = net; |
197 | netd->nlink = 2; | |
e9720acd PE |
198 | netd->namelen = 3; |
199 | netd->parent = &proc_root; | |
09570f91 | 200 | memcpy(netd->name, "net", 4); |
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 | { |
155134fe | 230 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
231 | |
232 | return register_pernet_subsys(&proc_net_ns_ops); | |
233 | } |