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) { | |
116 | ns = task_nsproxy(task); | |
117 | if (ns != NULL) | |
118 | net = get_net(ns->net_ns); | |
119 | } | |
120 | rcu_read_unlock(); | |
121 | ||
122 | return net; | |
123 | } | |
124 | ||
125 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
00cd8dd3 | 126 | struct dentry *dentry, unsigned int flags) |
e9720acd PE |
127 | { |
128 | struct dentry *de; | |
129 | struct net *net; | |
130 | ||
131 | de = ERR_PTR(-ENOENT); | |
132 | net = get_proc_task_net(dir); | |
133 | if (net != NULL) { | |
134 | de = proc_lookup_de(net->proc_net, dir, dentry); | |
135 | put_net(net); | |
136 | } | |
137 | return de; | |
138 | } | |
139 | ||
140 | static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
141 | struct kstat *stat) | |
142 | { | |
143 | struct inode *inode = dentry->d_inode; | |
144 | struct net *net; | |
145 | ||
146 | net = get_proc_task_net(inode); | |
147 | ||
148 | generic_fillattr(inode, stat); | |
149 | ||
150 | if (net != NULL) { | |
151 | stat->nlink = net->proc_net->nlink; | |
152 | put_net(net); | |
153 | } | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | const struct inode_operations proc_net_inode_operations = { | |
159 | .lookup = proc_tgid_net_lookup, | |
160 | .getattr = proc_tgid_net_getattr, | |
161 | }; | |
162 | ||
f0c3b509 | 163 | static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx) |
e9720acd PE |
164 | { |
165 | int ret; | |
166 | struct net *net; | |
167 | ||
168 | ret = -EINVAL; | |
f0c3b509 | 169 | net = get_proc_task_net(file_inode(file)); |
e9720acd | 170 | if (net != NULL) { |
f0c3b509 | 171 | ret = proc_readdir_de(net->proc_net, file, ctx); |
e9720acd PE |
172 | put_net(net); |
173 | } | |
174 | return ret; | |
175 | } | |
176 | ||
177 | const struct file_operations proc_net_operations = { | |
b4df2b92 | 178 | .llseek = generic_file_llseek, |
e9720acd | 179 | .read = generic_read_dir, |
f0c3b509 | 180 | .iterate = proc_tgid_net_readdir, |
e9720acd PE |
181 | }; |
182 | ||
4665079c | 183 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 184 | { |
e9720acd | 185 | struct proc_dir_entry *netd, *net_statd; |
3c12afe7 DM |
186 | int err; |
187 | ||
188 | err = -ENOMEM; | |
09570f91 | 189 | netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL); |
e9720acd | 190 | if (!netd) |
3c12afe7 DM |
191 | goto out; |
192 | ||
e9720acd PE |
193 | netd->data = net; |
194 | netd->nlink = 2; | |
e9720acd PE |
195 | netd->namelen = 3; |
196 | netd->parent = &proc_root; | |
09570f91 | 197 | memcpy(netd->name, "net", 4); |
3c12afe7 DM |
198 | |
199 | err = -EEXIST; | |
e5d69b9f | 200 | net_statd = proc_net_mkdir(net, "stat", netd); |
3c12afe7 DM |
201 | if (!net_statd) |
202 | goto free_net; | |
203 | ||
3c12afe7 DM |
204 | net->proc_net = netd; |
205 | net->proc_net_stat = net_statd; | |
e9720acd | 206 | return 0; |
3c12afe7 | 207 | |
e9720acd PE |
208 | free_net: |
209 | kfree(netd); | |
3c12afe7 DM |
210 | out: |
211 | return err; | |
3c12afe7 DM |
212 | } |
213 | ||
4665079c | 214 | static __net_exit void proc_net_ns_exit(struct net *net) |
3c12afe7 DM |
215 | { |
216 | remove_proc_entry("stat", net->proc_net); | |
e9720acd | 217 | kfree(net->proc_net); |
3c12afe7 DM |
218 | } |
219 | ||
022cbae6 | 220 | static struct pernet_operations __net_initdata proc_net_ns_ops = { |
3c12afe7 DM |
221 | .init = proc_net_ns_init, |
222 | .exit = proc_net_ns_exit, | |
223 | }; | |
224 | ||
4665079c | 225 | int __init proc_net_init(void) |
3c12afe7 | 226 | { |
e9720acd | 227 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
228 | |
229 | return register_pernet_subsys(&proc_net_ns_ops); | |
230 | } |